Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (2): 20210571.doi: 10.7503/cjcu20210571
• Physical Chemistry • Previous Articles Next Articles
MU Hongwen1,2, WU Hao2, GAO Yingying1, JIN Ying1(), WANG Liming1()
Received:
2021-08-13
Online:
2022-02-10
Published:
2021-10-13
Contact:
JIN Ying,WANG Liming
E-mail:jinying2288@163.com;13630635312@163.com
Supported by:
CLC Number:
TrendMD:
MU Hongwen, WU Hao, GAO Yingying, JIN Ying, WANG Liming. Organocatalyzed Asymmetric Friedel-Crafts Alkylation in the Carbocyclic Ring of Indole[J]. Chem. J. Chinese Universities, 2022, 43(2): 20210571.
Entry | Catalyst | Solvent | Temp./℃ | Cat. loading(%, molar fraction) | Yield(%)b | e.e.(%)c | Conf.d |
---|---|---|---|---|---|---|---|
1 | 1a | Et2O | r.t. | 10 | 80 | +39 | R |
2 | 1b | Et2O | r.t. | 10 | 86 | -84 | S |
3 | 1c | Et2O | r.t. | 10 | 84 | +28 | R |
4 | 1d | Et2O | r.t. | 10 | 85 | -48 | S |
5 | 1e | Et2O | r.t. | 10 | 80 | -21 | S |
6 | 1f | Et2O | r.t. | 10 | 83 | +13 | R |
7 | 1b | DCM | r.t. | 10 | 89 | -58 | S |
8 | 1b | THF | r.t. | 10 | 90 | -91 | S |
9 | 1b | Toluene | r.t. | 10 | 78 | -13 | S |
10 | 1b | THF | r.t. | 5 | 92 | -92 | S |
11 | 1b | THF | r.t. | 20 | 88 | -91 | S |
12e | 1b | THF | r.t. | 5 | 80 | -90 | S |
13 | 1b | THF | 0 | 5 | 89 | -94 | S |
14 | 1b | THF | -40 | 5 | 78 | -73 | S |
Table 1 Screening of reaction conditions for the asymmetric Friedel-Crafts reaction of 4-hydroxyindole with isatina
Entry | Catalyst | Solvent | Temp./℃ | Cat. loading(%, molar fraction) | Yield(%)b | e.e.(%)c | Conf.d |
---|---|---|---|---|---|---|---|
1 | 1a | Et2O | r.t. | 10 | 80 | +39 | R |
2 | 1b | Et2O | r.t. | 10 | 86 | -84 | S |
3 | 1c | Et2O | r.t. | 10 | 84 | +28 | R |
4 | 1d | Et2O | r.t. | 10 | 85 | -48 | S |
5 | 1e | Et2O | r.t. | 10 | 80 | -21 | S |
6 | 1f | Et2O | r.t. | 10 | 83 | +13 | R |
7 | 1b | DCM | r.t. | 10 | 89 | -58 | S |
8 | 1b | THF | r.t. | 10 | 90 | -91 | S |
9 | 1b | Toluene | r.t. | 10 | 78 | -13 | S |
10 | 1b | THF | r.t. | 5 | 92 | -92 | S |
11 | 1b | THF | r.t. | 20 | 88 | -91 | S |
12e | 1b | THF | r.t. | 5 | 80 | -90 | S |
13 | 1b | THF | 0 | 5 | 89 | -94 | S |
14 | 1b | THF | -40 | 5 | 78 | -73 | S |
Compound | —OH | R1 | R2 | Yield(%)b | e.e.(%)c | Specific rotationd |
---|---|---|---|---|---|---|
3a | 4?OH | H | H | 89 | 94 | -53.58 |
3b | 4?OH | H | 4?Br | 76 | 72 | -7.08 |
3c | 4?OH | H | 5?Me | 85 | 90 | -67.36 |
3d | 4?OH | H | 5?MeO | 72 | 97 | -45.12 |
3e | 4?OH | H | 5?Cl | 80 | 93 | -98.59 |
3f | 4?OH | H | 5?Br | 76 | 90 | -81.25 |
3g | 4?OH | H | 5,6?2F | 72 | 92 | -4.50 |
3h | 4?OH | H | 6?Br | 80 | 90 | -10.77 |
3i | 4?OH | H | 7?F | 78 | 88 | -40.78 |
3j | 4?OH | H | 7?Cl | 80 | 64 | -11.00 |
3k | 4?OH | Me | H | 88 | 94 | -63.02 |
3l | 4?OH | Bn | H | 91 | 91 | -19.19 |
4a | 5?OH | H | H | 70 | 81 | -0.96 |
4b | 5?OH | 5?Cl | H | 76 | 88 | -9.88 |
4c | 5?OH | 5?F | H | 72 | 81 | -6.50 |
4d | 5?OH | 5?Me | H | 73 | 83 | -9.35 |
4e | 5?OH | 5?OMe | H | 68 | 62 | -1.08 |
4f | 5?OH | 5,6?2F | H | 72 | 86 | -3.50 |
4g | 5?OH | 7?F | H | 75 | 82 | -12.00 |
4h | 5?OH | Me | H | 77 | 80 | -3.00 |
5a | 6?OH | H | H | 75 | 88 | 43.69 |
5b | 6?OH | H | 5?Cl | 73 | 92 | 44.50 |
5c | 6?OH | Me | H | 72 | 93 | -95.62 |
5d | 6?OH | Bn | H | 67 | 89 | -168.35 |
6a | 7?OH | H | H | 68 | 72 | -38.89 |
6b | 7?OH | H | 5?Cl | 75 | 78 | -11.87 |
6c | 7?OH | Me | H | 70 | 72 | -0.25 |
Table 2 Scope of the enantioselective Friedel-Crafts reaction of hydroxyindoles with isatinsa
Compound | —OH | R1 | R2 | Yield(%)b | e.e.(%)c | Specific rotationd |
---|---|---|---|---|---|---|
3a | 4?OH | H | H | 89 | 94 | -53.58 |
3b | 4?OH | H | 4?Br | 76 | 72 | -7.08 |
3c | 4?OH | H | 5?Me | 85 | 90 | -67.36 |
3d | 4?OH | H | 5?MeO | 72 | 97 | -45.12 |
3e | 4?OH | H | 5?Cl | 80 | 93 | -98.59 |
3f | 4?OH | H | 5?Br | 76 | 90 | -81.25 |
3g | 4?OH | H | 5,6?2F | 72 | 92 | -4.50 |
3h | 4?OH | H | 6?Br | 80 | 90 | -10.77 |
3i | 4?OH | H | 7?F | 78 | 88 | -40.78 |
3j | 4?OH | H | 7?Cl | 80 | 64 | -11.00 |
3k | 4?OH | Me | H | 88 | 94 | -63.02 |
3l | 4?OH | Bn | H | 91 | 91 | -19.19 |
4a | 5?OH | H | H | 70 | 81 | -0.96 |
4b | 5?OH | 5?Cl | H | 76 | 88 | -9.88 |
4c | 5?OH | 5?F | H | 72 | 81 | -6.50 |
4d | 5?OH | 5?Me | H | 73 | 83 | -9.35 |
4e | 5?OH | 5?OMe | H | 68 | 62 | -1.08 |
4f | 5?OH | 5,6?2F | H | 72 | 86 | -3.50 |
4g | 5?OH | 7?F | H | 75 | 82 | -12.00 |
4h | 5?OH | Me | H | 77 | 80 | -3.00 |
5a | 6?OH | H | H | 75 | 88 | 43.69 |
5b | 6?OH | H | 5?Cl | 73 | 92 | 44.50 |
5c | 6?OH | Me | H | 72 | 93 | -95.62 |
5d | 6?OH | Bn | H | 67 | 89 | -168.35 |
6a | 7?OH | H | H | 68 | 72 | -38.89 |
6b | 7?OH | H | 5?Cl | 75 | 78 | -11.87 |
6c | 7?OH | Me | H | 70 | 72 | -0.25 |
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