高等学校化学学报 ›› 2023, Vol. 44 ›› Issue (2): 20220473.doi: 10.7503/cjcu20220473
收稿日期:
2022-07-11
出版日期:
2023-02-10
发布日期:
2022-10-21
通讯作者:
王迎春
E-mail:wangyingchunjsu@163.com
基金资助:
LIN Junxu1, XI Zhiwei2, LI Zhiping1, WANG Yingchun1()
Received:
2022-07-11
Online:
2023-02-10
Published:
2022-10-21
Contact:
WANG Yingchun
E-mail:wangyingchunjsu@163.com
Supported by:
摘要:
报道了钯催化下炔丙醇与叔丁基异腈反应高选择性合成吡咯并呋喃衍生物和氨基甲酸酯的新方法. 在10%(摩尔分数)Pd(OAc)2与110%(摩尔分数)LiBr存在下, 一分子炔丙醇与三分子叔丁基异腈在水的参与下发生“有序的”异腈三重插入反应, 以56%~73%的产率高选择性地生成了吡咯并呋喃衍生物; 而在10%(摩尔分数)Pd(PPh3)4和110%(摩尔分数)K3PO4存在下, 一分子炔丙醇与一分子叔丁基异腈在空气中氧气的参与下发生简单氧化偶联反应, 以51%~74%的产率生成了氨基甲酸酯. 该方法仅通过简单改变钯催化剂与盐的种类就能得到不同产物, 且反应选择性高, 分别为吡咯并呋喃亚胺衍生物和氨基甲酸酯提供了有吸引力的合成途径.
中图分类号:
TrendMD:
林俊旭, 习志威, 李志平, 王迎春. 钯催化炔丙醇与叔丁基异腈选择性合成吡咯并呋喃衍生物和氨基甲酸酯. 高等学校化学学报, 2023, 44(2): 20220473.
LIN Junxu, XI Zhiwei, LI Zhiping, WANG Yingchun. Palladium Catalyzed Selective Synthesis of Pyrrolofuran Derivatives and Carbamates from Propargylic Alcohols and tert⁃Butyl Isonitrile. Chem. J. Chinese Universities, 2023, 44(2): 20220473.
Compd. | Appearance | Yield(%) | m.p./℃ | HRMS(calcd.), m/z[M+H]+ |
---|---|---|---|---|
2a | White solid | 73 | 141.1—142.2 | 382.2853(382.2853) |
2b | White solid | 60 | 131.2—132.6 | 396.3010(396.3009) |
2c | Yellow solid | 65 | 69.5—71.1 | 410.3163(410.3166) |
2d | Yellow solid | 61 | 96.2—97.1 | 410.3163(410.3166) |
2e | Yellow oil | 71 | — | 410.3163(410.3166) |
2f | Brown oil | 72 | — | 426.3112(426.3116) |
2g | Yellow oil | 58 | — | 430.2621(430.2620) |
2h | Yellow solid | 65 | 126.2—127.8 | 464.2884(464.2883) |
2i | Yellow oil | 58 | — | 438.3115(438.3115) |
2j | Yellow oil | 56 | — | 446.3165(446.3166) |
2k | Yellow oil | 61 | — | 402.2572(402.2574) |
Table 1 Appearance, yields, melting points and HRMS data of compounds 2a—2k
Compd. | Appearance | Yield(%) | m.p./℃ | HRMS(calcd.), m/z[M+H]+ |
---|---|---|---|---|
2a | White solid | 73 | 141.1—142.2 | 382.2853(382.2853) |
2b | White solid | 60 | 131.2—132.6 | 396.3010(396.3009) |
2c | Yellow solid | 65 | 69.5—71.1 | 410.3163(410.3166) |
2d | Yellow solid | 61 | 96.2—97.1 | 410.3163(410.3166) |
2e | Yellow oil | 71 | — | 410.3163(410.3166) |
2f | Brown oil | 72 | — | 426.3112(426.3116) |
2g | Yellow oil | 58 | — | 430.2621(430.2620) |
2h | Yellow solid | 65 | 126.2—127.8 | 464.2884(464.2883) |
2i | Yellow oil | 58 | — | 438.3115(438.3115) |
2j | Yellow oil | 56 | — | 446.3165(446.3166) |
2k | Yellow oil | 61 | — | 402.2572(402.2574) |
Compd. | 1H NMR(400 MHz, CDCl3), δ | 13C NMR(100 MHz, CDCl3), δ |
---|---|---|
2a | 7.33(d, J=4.3 Hz, 4H), 7.18(dt, J=8.5, 4.1 Hz, 1H), 5.12(s, 2H), 3.00(s, 1H), 1.87(s, 9H), 1.36(s, 9H), 0.87(s, 9H) | 149.8, 140.2, 137.1, 133.5, 128.5, 128.4, 125.6, 124.7, 114.1, 67.7, 60.4, 55.8, 53.4, 31.5, 30.6, 30.2 |
2b | 7.40—7.29(m, 4H), 7.23—7.16(m, 1H), 5.49(q, J=6.4 Hz, 1H), 2.96(s, 1H), 1.89(s, 10H), 1.37(s, 9H), 1.31(d, J=6.4 Hz, 3H), 0.85(s, 9H) | 149.5, 140.1, 137.7, 136.7, 129.1, 128.4, 125.6, 124.5, 114.3, 75.4, 60.4, 55.6, 53.3, 31.5, 30.5, 30.2, 21.1 |
2c | 7.15—7.12(m, 4H), 5.23(q, J=6.4 Hz, 1H), 2.63(s, 1H), 2.26(s, 3H), 1.88(s, 9H), 1.35(s, 9H), 1.18(d, J=6.5 Hz, 3H), 0.78(s, 9H) | 149.8, 140.5, 138.6, 136.6, 135.8, 131.3, 130.2, 126.6, 125.5, 123.6, 113.4, 75.9, 60.3, 54.9, 53.3, 31.7, 30.6, 30.1, 21.3, 20.2 |
2d | 7.21(t, J=7.5 Hz, 1H), 7.14—7.03(m, 2H), 6.99(d, J=7.1 Hz, 1H), 5.46(q, J=6.1 Hz, 1H), 2.94(s, 1H), 2.35(s, 3H), 1.86(s, 9H), 1.34(s, 9H), 1.30(d, J=6.4 Hz, 3H), 0.81(d, J=13.6 Hz, 9H) | 149.5, 147.0, 140.2, 137.7, 136.5, 129.8, 128.2, 126.3, 126.2, 124.4, 114.3, 75.4, 60.3, 55.6, 53.3, 31.5, 30.4, 30.3, 21.5, 21.1 |
2e | 7.15(dd, J=18.5, 8.0 Hz, 4H), 5.46(q, J=6.3 Hz, 1H), 2.94(s, 1H), 2.34(s, 3H), 1.86(s, 9H), 1.34(s, 9H), 1.30(d, J=6.4 Hz, 3H), 0.83(s, 9H) | 149.6, 140.0, 137.7, 135.0, 133.6, 129.0, 128.9, 124.3, 114.1,75.3, 60.3, 55.6, 53.2, 31.4, 30.4, 30.2, 21.2, 21.0 |
2f | 7.22(d, J=8.6 Hz, 2H), 6.89(d, J=8.7 Hz, 2H), 5.45(q, J= 6.4 Hz, 1H), 3.82(s, 3H), 2.88 (s, 1H), 1.87 (s, 9H), 1.35(s, 9H), 1.31(d, J=2.1 Hz, 3H), 0.85(s, 9H) | 157.6, 149.6, 141.1, 140.0, 137.7, 130.1, 129.1, 113.8, 75.3, 60.2, 55.5, 55.2, 53.3, 31.5, 30.5, 30.3, 21.1 |
2g | 7.28(dd, J=12.3, 6.4 Hz, 4H), 5.45(q, J=6.4 Hz, 1H), 2.88(s, 1H), 1.86(s, 9H), 1.33(s, 9H), 1.28(d, J=6.4 Hz, 3H), 0.85(s, 9H) | 149.5, 140.0, 137.6, 135.0, 133.6, 129.0, 128.8, 114.1, 75.3, 60.2, 55.5, 53.2, 31.4, 30.4, 30.2, 21.1 |
2h | 7.59(d, J=8.2 Hz, 2H), 7.49(d, J=8.1 Hz, 2H), 5.52(q, J= 6.4 Hz, 1H), 2.91(s, 1H), 1.90(s, 9H), 1.37(s, 9H), 1.30(d, J=6.5 Hz, 3H), 0.87(s, 9H) | 149.2, 140.7, 140.2, 137.5, 129.0, 127.4(q, JCF=65.0 Hz), 124.5(q, JCF=540.0 Hz), 125.2(q, JCF=7.0 Hz), 125.1, 113.0, 75.3, 60.6, 55.9, 53.4, 31.4, 30.4, 30.3, 20.9 |
2i | 7.93(d, J=8.4 Hz, 2H), 7.45(d, J=8.4 Hz, 2H), 5.52(q, J= 6.4 Hz, 1H), 2.99(s, 1H), 2.61(s, 3H), 1.87(s, 9H), 1.34(s, 9H), 1.29(d, J=6.5 Hz, 3H), 0.86 s, 9H) | 197.8, 142.2, 134.2, 131.7, 128.8 128.6, 128.2, 124.5, 124.0, 113.3, 75.3, 60.6, 56.1, 31.3, 30.4, 30.3, 29.7, 28.2, 26.5, 20.9 |
2j | 7.89(dd, J=11.4, 6.7 Hz, 2H), 7.77(d, J=8.0 Hz, 1H), 7.47(dd, J=14.0, 6.8 Hz, 3H), 7.39(d, J=6.9 Hz, 1H), 5.25(q, J=6.2 Hz, 1H), 2.99(s, 1H), 1.94 s, 9H), 1.38(s, 9H), 1.01(d, J=6.3 Hz, 3H), 0.70(s, 9H) | 149.7, 141.1, 139.1, 133.9, 132.5, 128.5, 128.1, 127.6, 126.8, 126.1, 126.0, 125.6, 125.6, 125.4, 112.0, 75.8, 60.5, 55.0, 53.4, 31.7, 30.5, 29.9, 21.2 |
2k | 7.18(dd, J=5.1, 0.8 Hz, 1H), 7.00(dd, J=5.1, 3.5 Hz, 1H), 6.87(dd, J=3.4, 0.9 Hz, 1H), 5.43(q, J=6.4 Hz, 1H), 3.59—2.45(m, 1H), 2.96(s, 1H), 1.86(s, 9H), 1.42(d, J=6.4 Hz, 3H), 1.35(s, 9H), 0.94(s, 9H) | 149.4, 141.1, 138.4, 137.9, 127.0, 124.9, 124.7, 123.4, 107.4, 75.3, 60.7, 55.8, 53.4, 31.4, 30.4, 30.0, 21.2 |
Table 2 1H NMR and 13C NMR data of compounds 2a—2k
Compd. | 1H NMR(400 MHz, CDCl3), δ | 13C NMR(100 MHz, CDCl3), δ |
---|---|---|
2a | 7.33(d, J=4.3 Hz, 4H), 7.18(dt, J=8.5, 4.1 Hz, 1H), 5.12(s, 2H), 3.00(s, 1H), 1.87(s, 9H), 1.36(s, 9H), 0.87(s, 9H) | 149.8, 140.2, 137.1, 133.5, 128.5, 128.4, 125.6, 124.7, 114.1, 67.7, 60.4, 55.8, 53.4, 31.5, 30.6, 30.2 |
2b | 7.40—7.29(m, 4H), 7.23—7.16(m, 1H), 5.49(q, J=6.4 Hz, 1H), 2.96(s, 1H), 1.89(s, 10H), 1.37(s, 9H), 1.31(d, J=6.4 Hz, 3H), 0.85(s, 9H) | 149.5, 140.1, 137.7, 136.7, 129.1, 128.4, 125.6, 124.5, 114.3, 75.4, 60.4, 55.6, 53.3, 31.5, 30.5, 30.2, 21.1 |
2c | 7.15—7.12(m, 4H), 5.23(q, J=6.4 Hz, 1H), 2.63(s, 1H), 2.26(s, 3H), 1.88(s, 9H), 1.35(s, 9H), 1.18(d, J=6.5 Hz, 3H), 0.78(s, 9H) | 149.8, 140.5, 138.6, 136.6, 135.8, 131.3, 130.2, 126.6, 125.5, 123.6, 113.4, 75.9, 60.3, 54.9, 53.3, 31.7, 30.6, 30.1, 21.3, 20.2 |
2d | 7.21(t, J=7.5 Hz, 1H), 7.14—7.03(m, 2H), 6.99(d, J=7.1 Hz, 1H), 5.46(q, J=6.1 Hz, 1H), 2.94(s, 1H), 2.35(s, 3H), 1.86(s, 9H), 1.34(s, 9H), 1.30(d, J=6.4 Hz, 3H), 0.81(d, J=13.6 Hz, 9H) | 149.5, 147.0, 140.2, 137.7, 136.5, 129.8, 128.2, 126.3, 126.2, 124.4, 114.3, 75.4, 60.3, 55.6, 53.3, 31.5, 30.4, 30.3, 21.5, 21.1 |
2e | 7.15(dd, J=18.5, 8.0 Hz, 4H), 5.46(q, J=6.3 Hz, 1H), 2.94(s, 1H), 2.34(s, 3H), 1.86(s, 9H), 1.34(s, 9H), 1.30(d, J=6.4 Hz, 3H), 0.83(s, 9H) | 149.6, 140.0, 137.7, 135.0, 133.6, 129.0, 128.9, 124.3, 114.1,75.3, 60.3, 55.6, 53.2, 31.4, 30.4, 30.2, 21.2, 21.0 |
2f | 7.22(d, J=8.6 Hz, 2H), 6.89(d, J=8.7 Hz, 2H), 5.45(q, J= 6.4 Hz, 1H), 3.82(s, 3H), 2.88 (s, 1H), 1.87 (s, 9H), 1.35(s, 9H), 1.31(d, J=2.1 Hz, 3H), 0.85(s, 9H) | 157.6, 149.6, 141.1, 140.0, 137.7, 130.1, 129.1, 113.8, 75.3, 60.2, 55.5, 55.2, 53.3, 31.5, 30.5, 30.3, 21.1 |
2g | 7.28(dd, J=12.3, 6.4 Hz, 4H), 5.45(q, J=6.4 Hz, 1H), 2.88(s, 1H), 1.86(s, 9H), 1.33(s, 9H), 1.28(d, J=6.4 Hz, 3H), 0.85(s, 9H) | 149.5, 140.0, 137.6, 135.0, 133.6, 129.0, 128.8, 114.1, 75.3, 60.2, 55.5, 53.2, 31.4, 30.4, 30.2, 21.1 |
2h | 7.59(d, J=8.2 Hz, 2H), 7.49(d, J=8.1 Hz, 2H), 5.52(q, J= 6.4 Hz, 1H), 2.91(s, 1H), 1.90(s, 9H), 1.37(s, 9H), 1.30(d, J=6.5 Hz, 3H), 0.87(s, 9H) | 149.2, 140.7, 140.2, 137.5, 129.0, 127.4(q, JCF=65.0 Hz), 124.5(q, JCF=540.0 Hz), 125.2(q, JCF=7.0 Hz), 125.1, 113.0, 75.3, 60.6, 55.9, 53.4, 31.4, 30.4, 30.3, 20.9 |
2i | 7.93(d, J=8.4 Hz, 2H), 7.45(d, J=8.4 Hz, 2H), 5.52(q, J= 6.4 Hz, 1H), 2.99(s, 1H), 2.61(s, 3H), 1.87(s, 9H), 1.34(s, 9H), 1.29(d, J=6.5 Hz, 3H), 0.86 s, 9H) | 197.8, 142.2, 134.2, 131.7, 128.8 128.6, 128.2, 124.5, 124.0, 113.3, 75.3, 60.6, 56.1, 31.3, 30.4, 30.3, 29.7, 28.2, 26.5, 20.9 |
2j | 7.89(dd, J=11.4, 6.7 Hz, 2H), 7.77(d, J=8.0 Hz, 1H), 7.47(dd, J=14.0, 6.8 Hz, 3H), 7.39(d, J=6.9 Hz, 1H), 5.25(q, J=6.2 Hz, 1H), 2.99(s, 1H), 1.94 s, 9H), 1.38(s, 9H), 1.01(d, J=6.3 Hz, 3H), 0.70(s, 9H) | 149.7, 141.1, 139.1, 133.9, 132.5, 128.5, 128.1, 127.6, 126.8, 126.1, 126.0, 125.6, 125.6, 125.4, 112.0, 75.8, 60.5, 55.0, 53.4, 31.7, 30.5, 29.9, 21.2 |
2k | 7.18(dd, J=5.1, 0.8 Hz, 1H), 7.00(dd, J=5.1, 3.5 Hz, 1H), 6.87(dd, J=3.4, 0.9 Hz, 1H), 5.43(q, J=6.4 Hz, 1H), 3.59—2.45(m, 1H), 2.96(s, 1H), 1.86(s, 9H), 1.42(d, J=6.4 Hz, 3H), 1.35(s, 9H), 0.94(s, 9H) | 149.4, 141.1, 138.4, 137.9, 127.0, 124.9, 124.7, 123.4, 107.4, 75.3, 60.7, 55.8, 53.4, 31.4, 30.4, 30.0, 21.2 |
Compd. | Appearance | Yield(%) | m.p./℃ | HRMS(calcd.), m/z[M+H]+ |
---|---|---|---|---|
3a | Yellow oil | 74 | — | 254.1152(254.1151) |
3b | Yellow oil | 71 | — | 246.1488(246.1489) |
3c | Yellow oil | 68 | — | 260.1645(260.1645) |
3d | Yellow oil | 70 | — | 260.1646(260.1645) |
3e | Yellow oil | 69 | — | 260.1645(260.1645) |
3f | Yellow oil | 61 | — | 276.1594(276.1594) |
3g | Yellow oil | 63 | — | 324.0595(324.0594) 326.0577(326.0573) |
3h | Colorless oil | 61 | — | 372.0456(372.0455) |
3i | Yellow solid | 73 | 121.7—122.1 | 322.1801(322.1802) |
3j | Yellow oil | 51 | — | 234.1487(234.1489) |
Table 3 Appearance, yields, melting points and HRMS data of compounds 3a—3j
Compd. | Appearance | Yield(%) | m.p./℃ | HRMS(calcd.), m/z[M+H]+ |
---|---|---|---|---|
3a | Yellow oil | 74 | — | 254.1152(254.1151) |
3b | Yellow oil | 71 | — | 246.1488(246.1489) |
3c | Yellow oil | 68 | — | 260.1645(260.1645) |
3d | Yellow oil | 70 | — | 260.1646(260.1645) |
3e | Yellow oil | 69 | — | 260.1645(260.1645) |
3f | Yellow oil | 61 | — | 276.1594(276.1594) |
3g | Yellow oil | 63 | — | 324.0595(324.0594) 326.0577(326.0573) |
3h | Colorless oil | 61 | — | 372.0456(372.0455) |
3i | Yellow solid | 73 | 121.7—122.1 | 322.1801(322.1802) |
3j | Yellow oil | 51 | — | 234.1487(234.1489) |
Compd. | 1H NMR(400 MHz, CDCl3), δ | 13C NMR(100 MHz, CDCl3), δ |
---|---|---|
3a | 7.48—7.40(m, 2H), 7.35—7.27(m, 3H), 4.87(s, 2H), 4.78(s, 1H), 1.33(s, 9H) | 153.8, 131.9, 128.6, 128.3, 122.4, 86.1, 83.7, 52.6, 50.6, 28.9 |
3b | 7.46—7.40(m, 2H), 7.33—7.27(m, 3H), 5.61(q, J=6.6 Hz, 1H), 4.72(s, 1H), 1.55(d, J=6.6 Hz, 3H), 1.33(s, 9H) | 153.6, 140.5, 132.0, 129.4, 128.5, 125.4, 122.2, 92.2, 83.2, 60.7, 50.5, 28.9, 21.9, 20.6 |
3c | 7.39 d, J=7.5 Hz, 1H), 7.24—7.15(m, 2H), 7.11(td, J=7.4, 1.8 Hz, 1H), 5.64(q, J=6.5 Hz, 1H), 4.73(s, 1H), 2.41(s, 3H), 1.57(d, J=6.6 Hz, 3H), 1.34(s, 9H) | 153.6, 140.5, 132.0, 129.4, 128.5, 125.4, 122.2, 92.2, 83.2, 60.7, 50.5, 28.9, 21.9, 20.6 |
3d | 7.25—7.23(m, 2H), 7.18(t, J=7.5 Hz, 1H), 7.12(d, J=7.5 Hz, 1H), 5.61(q, J=6.6 Hz, 1H), 4.71(s, 1H), 2.31(s, 3H), 1.55(d, J=6.6 Hz, 3H), 1.33(s, 9H) | 151.2, 137.9, 132.5, 129.4, 128.9, 128.1, 122.3, 87.8, 84.4, 77.4, 77.0, 76.7, 60.6, 50.6, 28.9, 22.0, 21.2 |
3e | 7.33(d, J=8.1 Hz, 2H), 7.10(d, J=7.9 Hz, 2H), 5.61(q, J=6.6 Hz, 1H), 4.71(s, 1H), 2.34(s, 3H), 1.55(d, J=6.6 Hz, 3H), 1.33(s, 9H) | 153.6, 138.6, 131.8, 129.0, 119.4, 87.4, 84.4, 60.6, 50.5, 28.9, 22.0, 21.5 |
3f | 7.37(d, J=8.8 Hz, 2H), 6.81(d, J=8.8 Hz, 2H), 5.60(q, J=6.6 Hz, 1H), 4.72(s, 1H), 3.79(s, 3H), 1.54(d, J=6.6 Hz, 3H), 1.32(s, 9H) | 159.7, 133.4, 128.3, 114.5, 113.8, 86.7, 84.2, 60.7, 55.3, 50.5, 28.9, 22.1 |
3g | 7.42(d, J=8.3 Hz, 2H), 7.29(d, J=8.3 Hz, 2H), 5.59(q, J=6.6 Hz, 1H), 4.71(s, 1H), 1.54(d, J=6.6 Hz, 3H), 1.33(s, 9H) | 153.0, 133.3, 131.5, 122.8, 121.5, 89.3, 83.2, 60.4, 50.6, 28.9, 21.8 |
3h | 7.64(d, J=8.4 Hz, 2H), 7.16(d, J=8.4 Hz, 2H), 5.59(q, J=6.6 Hz, 1H), 4.71(s, 1H), 1.54(d, J=6.6 Hz, 3H), 1.33(s, 9H) | 150.9, 137.4, 133.4, 122.0, 94.4, 89.6, 83.3, 60.4, 50.6, 28.9, 21.8 |
3i | 7.60—7.50(m, 6H), 7.44(t, J=7.6 Hz, 2H), 7.36(t, J=7.3 Hz, 1H), 5.66(q, J=6.6 Hz, 1H), 4.75(s, 1H), 1.59(d, J=6.6 Hz, 3H), 1.35(s, 9H) | 153.6, 141.2, 140.3, 132.3, 128.9, 127.7, 127.0, 126.9, 121.4, 88.8, 84.2, 60.6, 50.6, 29.8, 22.0 |
3j | 7.39(d, J=7.3 Hz, 2H), 7.32(t, J=7.4 Hz, 2H), 7.26—7.22(m, 1H), 6.63(d, J=15.9 Hz, 1H), 6.28(dt, J=15.9, 6.3 Hz, 1H), 4.68(d, J=5.8 Hz, 2H), 4.67(s, 1H), 1.33(s, 9H) | 152.9, 136.4, 133.4, 128.6, 127.9, 126.6, 124.2, 64.7, 50.4, 29.0 |
Table 4 1H NMR and 13C NMR data of compounds 3a—3j
Compd. | 1H NMR(400 MHz, CDCl3), δ | 13C NMR(100 MHz, CDCl3), δ |
---|---|---|
3a | 7.48—7.40(m, 2H), 7.35—7.27(m, 3H), 4.87(s, 2H), 4.78(s, 1H), 1.33(s, 9H) | 153.8, 131.9, 128.6, 128.3, 122.4, 86.1, 83.7, 52.6, 50.6, 28.9 |
3b | 7.46—7.40(m, 2H), 7.33—7.27(m, 3H), 5.61(q, J=6.6 Hz, 1H), 4.72(s, 1H), 1.55(d, J=6.6 Hz, 3H), 1.33(s, 9H) | 153.6, 140.5, 132.0, 129.4, 128.5, 125.4, 122.2, 92.2, 83.2, 60.7, 50.5, 28.9, 21.9, 20.6 |
3c | 7.39 d, J=7.5 Hz, 1H), 7.24—7.15(m, 2H), 7.11(td, J=7.4, 1.8 Hz, 1H), 5.64(q, J=6.5 Hz, 1H), 4.73(s, 1H), 2.41(s, 3H), 1.57(d, J=6.6 Hz, 3H), 1.34(s, 9H) | 153.6, 140.5, 132.0, 129.4, 128.5, 125.4, 122.2, 92.2, 83.2, 60.7, 50.5, 28.9, 21.9, 20.6 |
3d | 7.25—7.23(m, 2H), 7.18(t, J=7.5 Hz, 1H), 7.12(d, J=7.5 Hz, 1H), 5.61(q, J=6.6 Hz, 1H), 4.71(s, 1H), 2.31(s, 3H), 1.55(d, J=6.6 Hz, 3H), 1.33(s, 9H) | 151.2, 137.9, 132.5, 129.4, 128.9, 128.1, 122.3, 87.8, 84.4, 77.4, 77.0, 76.7, 60.6, 50.6, 28.9, 22.0, 21.2 |
3e | 7.33(d, J=8.1 Hz, 2H), 7.10(d, J=7.9 Hz, 2H), 5.61(q, J=6.6 Hz, 1H), 4.71(s, 1H), 2.34(s, 3H), 1.55(d, J=6.6 Hz, 3H), 1.33(s, 9H) | 153.6, 138.6, 131.8, 129.0, 119.4, 87.4, 84.4, 60.6, 50.5, 28.9, 22.0, 21.5 |
3f | 7.37(d, J=8.8 Hz, 2H), 6.81(d, J=8.8 Hz, 2H), 5.60(q, J=6.6 Hz, 1H), 4.72(s, 1H), 3.79(s, 3H), 1.54(d, J=6.6 Hz, 3H), 1.32(s, 9H) | 159.7, 133.4, 128.3, 114.5, 113.8, 86.7, 84.2, 60.7, 55.3, 50.5, 28.9, 22.1 |
3g | 7.42(d, J=8.3 Hz, 2H), 7.29(d, J=8.3 Hz, 2H), 5.59(q, J=6.6 Hz, 1H), 4.71(s, 1H), 1.54(d, J=6.6 Hz, 3H), 1.33(s, 9H) | 153.0, 133.3, 131.5, 122.8, 121.5, 89.3, 83.2, 60.4, 50.6, 28.9, 21.8 |
3h | 7.64(d, J=8.4 Hz, 2H), 7.16(d, J=8.4 Hz, 2H), 5.59(q, J=6.6 Hz, 1H), 4.71(s, 1H), 1.54(d, J=6.6 Hz, 3H), 1.33(s, 9H) | 150.9, 137.4, 133.4, 122.0, 94.4, 89.6, 83.3, 60.4, 50.6, 28.9, 21.8 |
3i | 7.60—7.50(m, 6H), 7.44(t, J=7.6 Hz, 2H), 7.36(t, J=7.3 Hz, 1H), 5.66(q, J=6.6 Hz, 1H), 4.75(s, 1H), 1.59(d, J=6.6 Hz, 3H), 1.35(s, 9H) | 153.6, 141.2, 140.3, 132.3, 128.9, 127.7, 127.0, 126.9, 121.4, 88.8, 84.2, 60.6, 50.6, 29.8, 22.0 |
3j | 7.39(d, J=7.3 Hz, 2H), 7.32(t, J=7.4 Hz, 2H), 7.26—7.22(m, 1H), 6.63(d, J=15.9 Hz, 1H), 6.28(dt, J=15.9, 6.3 Hz, 1H), 4.68(d, J=5.8 Hz, 2H), 4.67(s, 1H), 1.33(s, 9H) | 152.9, 136.4, 133.4, 128.6, 127.9, 126.6, 124.2, 64.7, 50.4, 29.0 |
Entry | Catalyst(%, molar fraction) | Additive(%, molar fraction) | Solvent | Yield(%) b of compd.2a |
---|---|---|---|---|
1 c | Pd(OAc)2(10) | None | Toluene | 25 |
2 d | Pd(OAc)2(10) | None | Toluene | 51 |
3 | Pd(OAc)2(10) | Cs2CO3(110) | Toluene | 60 |
4 | Pd(OAc)2(10) | Na2CO3(110) | Toluene | 55 |
5 | Pd(OAc)2(10) | t BuNH2(110) | Toluene | 45 |
6 | Pd(OAc)2(10) | LiBr(110) | Toluene | 73 |
7 | Pd(OAc)2(10) | CsF(110) | Toluene | 0 |
8 | Pd(dppf)Cl2(10) | LiBr(110) | Toluene | 17 |
9 | PdCl2(10) | LiBr(110) | Toluene | 61 |
10 | Pd(PPh3)2Cl2(10) | LiBr(110) | Toluene | 57 |
11 | Pd(PPh3)4(10) | LiBr(110) | Toluene | 32 |
12 | FeCl3(10) | LiBr(110) | Toluene | 0 |
13 | CoCl2(10) | LiBr(110) | Toluene | 0 |
14 | NiCl2(10) | LiBr(110) | Toluene | 0 |
15 | Cu(OAc)2(10) | LiBr(110) | Toluene | 0 |
16 | Pd(OAc)2(10) | LiBr(110) | CH3CN | 61 |
17 | Pd(OAc)2(10) | LiBr(110) | DMF | 63 |
18 | Pd(OAc)2(10) | LiBr(110) | DCE | 60 |
19 | Pd(OAc)2(10) | LiBr(110) | 1,4⁃Dioxane | 0 |
20 | Pd(OAc)2(10) | LiBr(110) | DMSO | 0 |
Table 5 Optimization of reaction conditions for synthesis of pyrrolofuran derivatives a
Entry | Catalyst(%, molar fraction) | Additive(%, molar fraction) | Solvent | Yield(%) b of compd.2a |
---|---|---|---|---|
1 c | Pd(OAc)2(10) | None | Toluene | 25 |
2 d | Pd(OAc)2(10) | None | Toluene | 51 |
3 | Pd(OAc)2(10) | Cs2CO3(110) | Toluene | 60 |
4 | Pd(OAc)2(10) | Na2CO3(110) | Toluene | 55 |
5 | Pd(OAc)2(10) | t BuNH2(110) | Toluene | 45 |
6 | Pd(OAc)2(10) | LiBr(110) | Toluene | 73 |
7 | Pd(OAc)2(10) | CsF(110) | Toluene | 0 |
8 | Pd(dppf)Cl2(10) | LiBr(110) | Toluene | 17 |
9 | PdCl2(10) | LiBr(110) | Toluene | 61 |
10 | Pd(PPh3)2Cl2(10) | LiBr(110) | Toluene | 57 |
11 | Pd(PPh3)4(10) | LiBr(110) | Toluene | 32 |
12 | FeCl3(10) | LiBr(110) | Toluene | 0 |
13 | CoCl2(10) | LiBr(110) | Toluene | 0 |
14 | NiCl2(10) | LiBr(110) | Toluene | 0 |
15 | Cu(OAc)2(10) | LiBr(110) | Toluene | 0 |
16 | Pd(OAc)2(10) | LiBr(110) | CH3CN | 61 |
17 | Pd(OAc)2(10) | LiBr(110) | DMF | 63 |
18 | Pd(OAc)2(10) | LiBr(110) | DCE | 60 |
19 | Pd(OAc)2(10) | LiBr(110) | 1,4⁃Dioxane | 0 |
20 | Pd(OAc)2(10) | LiBr(110) | DMSO | 0 |
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