高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (8): 1707.doi: 10.7503/cjcu20170847
收稿日期:
2017-12-26
出版日期:
2018-08-10
发布日期:
2018-06-13
作者简介:
联系人简介: 陈 莉, 女, 博士, 副教授, 主要从事有机合成方法学及天然产物全合成方面的研究. E-mail: 基金资助:
DONG Xu, FENG Boxu, CHEN Li*(), LI Xin
Received:
2017-12-26
Online:
2018-08-10
Published:
2018-06-13
Contact:
CHEN Li
E-mail:chenliyss@nankai.edu.cn
Supported by:
摘要:
以双功能手性叔胺硫脲作为催化剂, 用于催化2,5-二羟基-1,4-二噻烷与氮叔丁氧羰基(N-Boc)醛亚胺的不对称[3+2]环化反应. 实验结果表明, 在10%(摩尔分数)手性催化剂的作用下, 反应底物均能高产率地转化成目标产物, 并且得到高达95%的对映选择性和7:1的非对映选择性, 实现了一系列含有四氢噻唑骨架的双手性中心化合物的合成.
中图分类号:
TrendMD:
董旭, 封博谞, 陈莉, 李鑫. 叔胺硫脲催化的2,5-二羟基-1,4-二噻烷与氮叔丁氧羰基醛亚胺的不对称[3+2]环化反应. 高等学校化学学报, 2018, 39(8): 1707.
DONG Xu, FENG Boxu, CHEN Li, LI Xin. Asymmetric [3+2] Annulations of 1,4-Di-thiane-2,5-diol and N-Boc Aldimines Catalyzed by Tertiary-amine Thiourea†. Chem. J. Chinese Universities, 2018, 39(8): 1707.
Compd. | Appearance | [α | Yield(%) | HRMS(calcd.), m/z[M+Na]+ |
---|---|---|---|---|
3a | Colorless oil | -20.6 | 96 | 304.0983(304.0975) |
3b | Colorless oil | -12.5 | 95 | 318.1140(318.1134) |
3c | Colorless oil | -15.3 | 93 | 318.1140(318.1133) |
3d | Colorless oil | -9.6 | 82 | 338.0594(338.0588) |
3e | Colorless oil | -9.8 | 91 | 382.0088(382.0077) |
3f | Yellow oil | -9.2 | 91 | 372.0857(372.0853) |
3g | Colorless oil | -16.3 | 95 | 334.1089(334.1087) |
3h | Colorless oil | -17.8 | 88 | 318.1140(318.1130) |
3i | White oil | -27.3 | 85 | 338.0594(338.0585) |
3j | White oil | -13.5 | 93 | 382.0088(382.0083) |
3k | Colorless oil | -14.9 | 90 | 338.0594(338.0585) |
3l | Colorless oil | -17.1 | 94 | 346.1453(346.1447) |
3m | White oil | -41.7 | 95 | 354.1140(354.1148) |
Table 1 Appearance, optical rotation, yields and HRMS data of compounds 3a—3m
Compd. | Appearance | [α | Yield(%) | HRMS(calcd.), m/z[M+Na]+ |
---|---|---|---|---|
3a | Colorless oil | -20.6 | 96 | 304.0983(304.0975) |
3b | Colorless oil | -12.5 | 95 | 318.1140(318.1134) |
3c | Colorless oil | -15.3 | 93 | 318.1140(318.1133) |
3d | Colorless oil | -9.6 | 82 | 338.0594(338.0588) |
3e | Colorless oil | -9.8 | 91 | 382.0088(382.0077) |
3f | Yellow oil | -9.2 | 91 | 372.0857(372.0853) |
3g | Colorless oil | -16.3 | 95 | 334.1089(334.1087) |
3h | Colorless oil | -17.8 | 88 | 318.1140(318.1130) |
3i | White oil | -27.3 | 85 | 338.0594(338.0585) |
3j | White oil | -13.5 | 93 | 382.0088(382.0083) |
3k | Colorless oil | -14.9 | 90 | 338.0594(338.0585) |
3l | Colorless oil | -17.1 | 94 | 346.1453(346.1447) |
3m | White oil | -41.7 | 95 | 354.1140(354.1148) |
Compd. | 1H NMR(400 MHz), δ | 13C NMR(100 MHz), δ |
---|---|---|
3a | 7.44(dd, J=7.2, 1.9 Hz, 2H), 7.32(dd, J=8.2, 6.4 Hz, 2H), 7.28—7.25(m, 1H), 6.00(s, 1H), 5.86(s, 1H), 4.18(s, 1H), 3.29(dd, J=12.0, 4.9 Hz, 1H), 3.09(dd, J=12.0, 3.3 Hz, 1H), 1.19(s, 9H) | 153.37, 141.80, 128.34, 127.73, 126.40, 84.59, 81.49, 65.02, 36.84, 27.98 |
3b | 7.44(d, J=8.1 Hz, 2H), 7.12(d, J=7.6 Hz, 2H), 6.04(s, 1H), 5.92(s, 1H), 5.26(d, J=4.5 Hz, 1H), 3.32(dd, J=11.7, 4.7 Hz, 1H), 2.98(dd, J=11.8, 2.2 Hz, 1H), 2.30(s, 3H),1.23(s, 9H) | 152.54, 139.72, 136.79, 128.48, 126.99, 83.96, 79.93, 64.79, 37.75, 27.39, 20.23 |
Compd. | 1H NMR(400 MHz), δ | 13C NMR(100 MHz), δ |
3c | 7.37(s, 1H), 7.35(s, 1H), 7.19(t, J=7.9 Hz, 1H), 7.06(d, J=7.2 Hz, 1H), 6.04(s, 1H), 5.90(s, 1H), 5.28(d, J=4.5 Hz, 1H), 3.32(dd, J=11.7, 4.7 Hz, 1H), 2.99(dd, J=11.7, 2.2 Hz, 1H), 2.31(s, 3H), 1.21(s, 9H) | 153.45, 143.49, 138.16, 128.85, 128.73, 128.50, 125.00, 84.86, 80.85, 65.88, 38.73, 28.27, 21.46 |
3d | 7.67(d, J=2.0 Hz, 1H), 7.50(d, J=7.5 Hz, 1H), 7.37—7.25(m, 1H), 6.09(s, 1H), 5.95(s, 1H), 5.49(d, J=4.4 Hz, 1H), 3.36(dd, J=11.7, 4.7 Hz, 1H), 3.02(dd, J=11.7, 2.0 Hz, 1H), 1.23(s, 9H) | 153.20, 146.28, 134.29, 130.51, 128.26, 127.99, 126.58, 84.70, 81.18, 65.19, 38.97, 28.28 |
3e | 7.82(s, 1H), 7.56(d, J=7.8 Hz, 1H), 7.44(d, J=8.1 Hz, 1H), 7.28(t, J=7.9 Hz, 1H), 6.09(s, 1H), 5.94(s, 1H), 5.52(d, J=4.3 Hz, 1H), 3.36(dd, J=11.7, 4.7 Hz, 1H), 3.02(d, J=11.7 Hz, 1H), 1.23(s, 9H) | 152.27, 145.60, 130.31, 130.07, 129.92, 126.13, 121.55, 83.77, 80.27, 64.23, 38.08, 27.37 |
3f | 7.70(m, 2H), 7.54(d, J=7.8 Hz, 1H), 7.46(t, J=7.7 Hz, 1H), 6.06(s, 1H), 5.88(s, 1H),4.35(s, 1H), 3.33(dd, J=12.0, 4.9 Hz, 1H), 3.10(dd, J=12.0, 2.9 Hz, 1H), 1.18(s, 9H) | 153.08, 143.11, 130.09, 128.98, 125.35, 124.63, 123.67, 122.64, 84.44, 81.93, 64.56, 37.10, 27.92 |
3g | 7.25—7.18(m, 2H), 7.10(dt, J=7.7, 1.2 Hz, 1H), 6.81(dd, J=8.1, 2.7 Hz, 1H), 6.05(q, J=3.8 Hz, 1H), 5.93(s, 1H), 5.36(s, 3H), 3.77(s, 1H), 3.33(dd, J=11.7, 4.8 Hz, 1H), 3.00(dd, J=11.6, 2.4 Hz, 1H), 1.22(s, 9H) | 160.61, 153.41, 145.32, 129.76, 120.05, 113.77, 113.24, 84.85, 80.93, 65.76, 55.48, 38.66, 28.30 |
3h | 7.75(dd, J=7.3, 1.5 Hz, 1H), 7.22—7.04(m, 3H), 6.15(s, 1H), 6.03(s, 1H), 5.31(s, 1H), 3.36(dd, J=11.8, 4.8 Hz, 1H), 2.98(dd, J=11.8, 3.0 Hz, 1H), 2.36(s, 3H), 1.17(s, 9H) | 153.43, 141.57, 135.09, 130.61, 127.92, 126.98, 126.92, 85.09, 80.82, 62.47, 38.06, 28.20, 19.28 |
3i | 7.67(d, J=7.7 Hz, 1H), 7.35(d, J=7.9 Hz, 1H), 7.32—7.18(m, 2H), 6.24(s, 1H), 5.97(s, 1H), 4.34(s, 1H), 3.30(dd, J=12.2, 5.4 Hz, 1H), 3.07(dd, J=12.2, 5.1 Hz, 1H), 1.24(s, 9H) | 153.29, 139.38, 132.00, 129.30, 128.71, 127.10, 85.14, 81.67, 61.60, 35.44, 29.69, 27.94 |
3j | 7.68(d, J=7.7 Hz, 1H), 7.54(dd, J=8.0, 3.3 Hz, 1H), 7.41—7.27(m, 1H), 7.15(d, J=6.4 Hz, 1H), 6.20(s, 1H), 5.98(t, J=4.9 Hz, 1H), 4.35(s, 1H), 3.38—3.21(m, 1H), 3.15—3.02(m, 1H), 1.25(s, 9H) | 153.32, 140.90, 132.62, 129.01, 127.77, 127.21, 122.11, 85.33, 81.71, 64.39, 35.34, 27.99 |
3k | 7.60(d, J=8.5 Hz, 2H), 7.35(d, J=8.1 Hz, 2H), 6.08(s, 1H), 5.95(s, 1H), 5.42(d, J=4.3 Hz, 1H), 3.35(dd, J=11.7, 4.7 Hz, 1H), 3.01(dd, J=11.7, 2.1 Hz, 1H), 1.23(s, 9H) | 152.31, 141.94, 132.51, 128.89, 127.96, 83.81, 80.18, 64.22, 37.98, 27.37 |
3l | 7.48(d, J=8.2 Hz, 2H), 7.19(d, J=8.1 Hz, 2H), 6.04(s, 1H), 5.92(s, 1H), 5.27(d, J=4.4 Hz, 1H), 3.32(dd, J=11.7, 4.7 Hz, 1H), 2.99(dd, J=11.7, 2.3 Hz, 1H), 2.94—2.77(m, 1H), 1.22(d, J=6.9 Hz, 6H), 1.18(s, 9H) | 152.55, 147.94, 140.04, 127.08, 125.83, 83.94, 79.93, 64.78, 37.78, 33.66, 27.38, 23.49 |
3m | 8.16(d, J=8.4 Hz, 1H), 7.96(dd, J=8.1, 1.7 Hz, 2H), 7.85(d, J=8.2 Hz, 1H), 7.68—7.45(m, 3H), 6.84(s, 1H), 6.17(s, 1H), 5.46(s, 1H), 3.46(dd, J=11.9, 5.1 Hz, 1H), 3.08—3.00(m, 1H), 1.10(s, 9H) | 152.73, 137.97, 133.78, 130.29, 128.74, 127.75, 126.07, 125.59, 125.34, 123.13, 122.92, 84.59, 80.03, 61.66, 37.27, 27.36 |
Table 2 1H NMR and 13C NMR data of compounds 3a—3m*
Compd. | 1H NMR(400 MHz), δ | 13C NMR(100 MHz), δ |
---|---|---|
3a | 7.44(dd, J=7.2, 1.9 Hz, 2H), 7.32(dd, J=8.2, 6.4 Hz, 2H), 7.28—7.25(m, 1H), 6.00(s, 1H), 5.86(s, 1H), 4.18(s, 1H), 3.29(dd, J=12.0, 4.9 Hz, 1H), 3.09(dd, J=12.0, 3.3 Hz, 1H), 1.19(s, 9H) | 153.37, 141.80, 128.34, 127.73, 126.40, 84.59, 81.49, 65.02, 36.84, 27.98 |
3b | 7.44(d, J=8.1 Hz, 2H), 7.12(d, J=7.6 Hz, 2H), 6.04(s, 1H), 5.92(s, 1H), 5.26(d, J=4.5 Hz, 1H), 3.32(dd, J=11.7, 4.7 Hz, 1H), 2.98(dd, J=11.8, 2.2 Hz, 1H), 2.30(s, 3H),1.23(s, 9H) | 152.54, 139.72, 136.79, 128.48, 126.99, 83.96, 79.93, 64.79, 37.75, 27.39, 20.23 |
Compd. | 1H NMR(400 MHz), δ | 13C NMR(100 MHz), δ |
3c | 7.37(s, 1H), 7.35(s, 1H), 7.19(t, J=7.9 Hz, 1H), 7.06(d, J=7.2 Hz, 1H), 6.04(s, 1H), 5.90(s, 1H), 5.28(d, J=4.5 Hz, 1H), 3.32(dd, J=11.7, 4.7 Hz, 1H), 2.99(dd, J=11.7, 2.2 Hz, 1H), 2.31(s, 3H), 1.21(s, 9H) | 153.45, 143.49, 138.16, 128.85, 128.73, 128.50, 125.00, 84.86, 80.85, 65.88, 38.73, 28.27, 21.46 |
3d | 7.67(d, J=2.0 Hz, 1H), 7.50(d, J=7.5 Hz, 1H), 7.37—7.25(m, 1H), 6.09(s, 1H), 5.95(s, 1H), 5.49(d, J=4.4 Hz, 1H), 3.36(dd, J=11.7, 4.7 Hz, 1H), 3.02(dd, J=11.7, 2.0 Hz, 1H), 1.23(s, 9H) | 153.20, 146.28, 134.29, 130.51, 128.26, 127.99, 126.58, 84.70, 81.18, 65.19, 38.97, 28.28 |
3e | 7.82(s, 1H), 7.56(d, J=7.8 Hz, 1H), 7.44(d, J=8.1 Hz, 1H), 7.28(t, J=7.9 Hz, 1H), 6.09(s, 1H), 5.94(s, 1H), 5.52(d, J=4.3 Hz, 1H), 3.36(dd, J=11.7, 4.7 Hz, 1H), 3.02(d, J=11.7 Hz, 1H), 1.23(s, 9H) | 152.27, 145.60, 130.31, 130.07, 129.92, 126.13, 121.55, 83.77, 80.27, 64.23, 38.08, 27.37 |
3f | 7.70(m, 2H), 7.54(d, J=7.8 Hz, 1H), 7.46(t, J=7.7 Hz, 1H), 6.06(s, 1H), 5.88(s, 1H),4.35(s, 1H), 3.33(dd, J=12.0, 4.9 Hz, 1H), 3.10(dd, J=12.0, 2.9 Hz, 1H), 1.18(s, 9H) | 153.08, 143.11, 130.09, 128.98, 125.35, 124.63, 123.67, 122.64, 84.44, 81.93, 64.56, 37.10, 27.92 |
3g | 7.25—7.18(m, 2H), 7.10(dt, J=7.7, 1.2 Hz, 1H), 6.81(dd, J=8.1, 2.7 Hz, 1H), 6.05(q, J=3.8 Hz, 1H), 5.93(s, 1H), 5.36(s, 3H), 3.77(s, 1H), 3.33(dd, J=11.7, 4.8 Hz, 1H), 3.00(dd, J=11.6, 2.4 Hz, 1H), 1.22(s, 9H) | 160.61, 153.41, 145.32, 129.76, 120.05, 113.77, 113.24, 84.85, 80.93, 65.76, 55.48, 38.66, 28.30 |
3h | 7.75(dd, J=7.3, 1.5 Hz, 1H), 7.22—7.04(m, 3H), 6.15(s, 1H), 6.03(s, 1H), 5.31(s, 1H), 3.36(dd, J=11.8, 4.8 Hz, 1H), 2.98(dd, J=11.8, 3.0 Hz, 1H), 2.36(s, 3H), 1.17(s, 9H) | 153.43, 141.57, 135.09, 130.61, 127.92, 126.98, 126.92, 85.09, 80.82, 62.47, 38.06, 28.20, 19.28 |
3i | 7.67(d, J=7.7 Hz, 1H), 7.35(d, J=7.9 Hz, 1H), 7.32—7.18(m, 2H), 6.24(s, 1H), 5.97(s, 1H), 4.34(s, 1H), 3.30(dd, J=12.2, 5.4 Hz, 1H), 3.07(dd, J=12.2, 5.1 Hz, 1H), 1.24(s, 9H) | 153.29, 139.38, 132.00, 129.30, 128.71, 127.10, 85.14, 81.67, 61.60, 35.44, 29.69, 27.94 |
3j | 7.68(d, J=7.7 Hz, 1H), 7.54(dd, J=8.0, 3.3 Hz, 1H), 7.41—7.27(m, 1H), 7.15(d, J=6.4 Hz, 1H), 6.20(s, 1H), 5.98(t, J=4.9 Hz, 1H), 4.35(s, 1H), 3.38—3.21(m, 1H), 3.15—3.02(m, 1H), 1.25(s, 9H) | 153.32, 140.90, 132.62, 129.01, 127.77, 127.21, 122.11, 85.33, 81.71, 64.39, 35.34, 27.99 |
3k | 7.60(d, J=8.5 Hz, 2H), 7.35(d, J=8.1 Hz, 2H), 6.08(s, 1H), 5.95(s, 1H), 5.42(d, J=4.3 Hz, 1H), 3.35(dd, J=11.7, 4.7 Hz, 1H), 3.01(dd, J=11.7, 2.1 Hz, 1H), 1.23(s, 9H) | 152.31, 141.94, 132.51, 128.89, 127.96, 83.81, 80.18, 64.22, 37.98, 27.37 |
3l | 7.48(d, J=8.2 Hz, 2H), 7.19(d, J=8.1 Hz, 2H), 6.04(s, 1H), 5.92(s, 1H), 5.27(d, J=4.4 Hz, 1H), 3.32(dd, J=11.7, 4.7 Hz, 1H), 2.99(dd, J=11.7, 2.3 Hz, 1H), 2.94—2.77(m, 1H), 1.22(d, J=6.9 Hz, 6H), 1.18(s, 9H) | 152.55, 147.94, 140.04, 127.08, 125.83, 83.94, 79.93, 64.78, 37.78, 33.66, 27.38, 23.49 |
3m | 8.16(d, J=8.4 Hz, 1H), 7.96(dd, J=8.1, 1.7 Hz, 2H), 7.85(d, J=8.2 Hz, 1H), 7.68—7.45(m, 3H), 6.84(s, 1H), 6.17(s, 1H), 5.46(s, 1H), 3.46(dd, J=11.9, 5.1 Hz, 1H), 3.08—3.00(m, 1H), 1.10(s, 9H) | 152.73, 137.97, 133.78, 130.29, 128.74, 127.75, 126.07, 125.59, 125.34, 123.13, 122.92, 84.59, 80.03, 61.66, 37.27, 27.36 |
Entry | Catalyst | Solvent | t/h | Yieldb(%) | d.r.c | e.e.(%)c |
---|---|---|---|---|---|---|
1 | 4a | CH2Cl2 | 2 | 88 | 1:1 | 20/66d |
2 | 4b | CH2Cl2 | 4 | 78 | 1:1 | 38/60 |
3 | 4c | CH2Cl2 | 2 | 88 | 2:1 | 33/50 |
4 | 4d | CH2Cl2 | 2 | 89 | 1:1 | 34/24 |
5 | 4e | CH2Cl2 | 2 | 97 | 2:1 | 53/34 |
6 | 4f | CH2Cl2 | 2 | 99 | 3:2 | 73/25 |
7 | 4f | Toluene | 2 | 96 | 3:2 | 78/31 |
8 | 4f | CHCl3 | 2 | 98 | 3:2 | 83/5 |
9 | 4f | 1,2-Dichloroethane | 2 | 92 | 3:2 | 74/29 |
10 | 4f | Tetrahydrofuran | 2 | 95 | 3:2 | 69/23 |
11 | 4f | Chlorobenzene | 2 | 96 | 3:2 | 73/34 |
12 | 4f | Acetonitrile | 2 | 96 | 3:2 | 31/33 |
13 | 4f | Ethyl acetate | 2 | 91 | 3:2 | 79/15 |
14e | 4f | CHCl3 | 6 | 95 | 2:1 | 92/27 |
15f | 4f | CHCl3 | 6 | 93 | 2:1 | 92/29 |
16g | 4f | CHCl3 | 6 | 96 | 3:1 | 92/34 |
17h | 4f | CHCl3 | 6 | 90 | 2:1 | 91/28 |
18i | 4f | CHCl3 | 6 | 85 | 1:1 | 88/43 |
Table 3 Optimization of reaction conditionsa
Entry | Catalyst | Solvent | t/h | Yieldb(%) | d.r.c | e.e.(%)c |
---|---|---|---|---|---|---|
1 | 4a | CH2Cl2 | 2 | 88 | 1:1 | 20/66d |
2 | 4b | CH2Cl2 | 4 | 78 | 1:1 | 38/60 |
3 | 4c | CH2Cl2 | 2 | 88 | 2:1 | 33/50 |
4 | 4d | CH2Cl2 | 2 | 89 | 1:1 | 34/24 |
5 | 4e | CH2Cl2 | 2 | 97 | 2:1 | 53/34 |
6 | 4f | CH2Cl2 | 2 | 99 | 3:2 | 73/25 |
7 | 4f | Toluene | 2 | 96 | 3:2 | 78/31 |
8 | 4f | CHCl3 | 2 | 98 | 3:2 | 83/5 |
9 | 4f | 1,2-Dichloroethane | 2 | 92 | 3:2 | 74/29 |
10 | 4f | Tetrahydrofuran | 2 | 95 | 3:2 | 69/23 |
11 | 4f | Chlorobenzene | 2 | 96 | 3:2 | 73/34 |
12 | 4f | Acetonitrile | 2 | 96 | 3:2 | 31/33 |
13 | 4f | Ethyl acetate | 2 | 91 | 3:2 | 79/15 |
14e | 4f | CHCl3 | 6 | 95 | 2:1 | 92/27 |
15f | 4f | CHCl3 | 6 | 93 | 2:1 | 92/29 |
16g | 4f | CHCl3 | 6 | 96 | 3:1 | 92/34 |
17h | 4f | CHCl3 | 6 | 90 | 2:1 | 91/28 |
18i | 4f | CHCl3 | 6 | 85 | 1:1 | 88/43 |
Entry | R | Product | Yieldb(%) | d.r.c | e.e.(%)d |
---|---|---|---|---|---|
1 | Ph | 3a | 96 | 3:1 | 92e/34e |
2f | 4-Me-Ph | 3b | 95 | 7:1 | 92/34 |
3 | 3-Me-Ph | 3c | 93 | 2:1 | 92/37 |
4 | 3-Cl-Ph | 3d | 82 | 1:1 | 91/24 |
5 | 3-Br-Ph | 3e | 91 | 1:1 | 92/25 |
6 | 3-CF3-Ph | 3f | 91 | 1:1 | 87/12 |
7 | 3-MeO-Ph | 3g | 95 | 2:1 | 88/29 |
8 | 2-Me-Ph | 3h | 88 | 3:2 | 76/26 |
9 | 2-Cl-Ph | 3i | 85 | 1:2 | 72/25 |
10 | 2-Br-Ph | 3j | 93 | 1:2 | 76/33 |
11 | 4-Cl-Ph | 3k | 90 | 2:1 | 95/33 |
12 | 4-i-Pr-Ph | 3l | 94 | 2:1 | 94/44 |
13 | 1-Naphthyl | 3m | 95 | 2:1 | 92/48 |
Table 4 Substratescope of the [3+2] annulation reactiona
Entry | R | Product | Yieldb(%) | d.r.c | e.e.(%)d |
---|---|---|---|---|---|
1 | Ph | 3a | 96 | 3:1 | 92e/34e |
2f | 4-Me-Ph | 3b | 95 | 7:1 | 92/34 |
3 | 3-Me-Ph | 3c | 93 | 2:1 | 92/37 |
4 | 3-Cl-Ph | 3d | 82 | 1:1 | 91/24 |
5 | 3-Br-Ph | 3e | 91 | 1:1 | 92/25 |
6 | 3-CF3-Ph | 3f | 91 | 1:1 | 87/12 |
7 | 3-MeO-Ph | 3g | 95 | 2:1 | 88/29 |
8 | 2-Me-Ph | 3h | 88 | 3:2 | 76/26 |
9 | 2-Cl-Ph | 3i | 85 | 1:2 | 72/25 |
10 | 2-Br-Ph | 3j | 93 | 1:2 | 76/33 |
11 | 4-Cl-Ph | 3k | 90 | 2:1 | 95/33 |
12 | 4-i-Pr-Ph | 3l | 94 | 2:1 | 94/44 |
13 | 1-Naphthyl | 3m | 95 | 2:1 | 92/48 |
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