Transition metal promoted reactions. 38. NiCl2(dppe)-catalyzed geminal dialkylation of dithioacetals and trimethylation of ortho thioesters
摘要:
NiCl2(dppe)-catalyzed cross-coupling of cinnamaldehyde dithioacetals gave the corresponding geminal dimethylation products in excellent yields. Allylic ortho thioesters afforded regioselectively the corresponding trimethylation products. The reaction may occur via an 18-electron pi-allyl intermediate, which undergoes facile reductive elimination to afford the geminal dimethylation product. Benzylic dithioacetals having an ortho amino group gave 2-isopropylanilines exclusively. The reaction of benzylic dithioacetals with EtMgBr under the same conditions yielded geminal diethylation products.
Ni, Zhi-Jie; Yang, Pin-Fan; Ng, Dennis K. P., Journal of the American Chemical Society, 1990, vol. 112, # 25, p. 9356 - 9364
作者:Ni, Zhi-Jie、Yang, Pin-Fan、Ng, Dennis K. P.、Tzeng, Yih-Ling、Luh, Tien-Yau
DOI:——
日期:——
NI, ZHI-JIE;YANG, PIN-FAN;NG, DENNIS K. P.;TZENG, YIH-LING;LUH, TIEN-YAU, J. AMER. CHEM. SOC., 112,(1990) N5, C. 9356-9364
作者:NI, ZHI-JIE、YANG, PIN-FAN、NG, DENNIS K. P.、TZENG, YIH-LING、LUH, TIEN-YAU
DOI:——
日期:——
Transition metal promoted reactions. 38. NiCl2(dppe)-catalyzed geminal dialkylation of dithioacetals and trimethylation of ortho thioesters
作者:Yih Ling Tzeng、Ping Fan Yang、Nai Wen Mei、Tien Min Yuan、Chun Chi Yu、Tien Yau Luh
DOI:10.1021/jo00018a016
日期:1991.8
NiCl2(dppe)-catalyzed cross-coupling of cinnamaldehyde dithioacetals gave the corresponding geminal dimethylation products in excellent yields. Allylic ortho thioesters afforded regioselectively the corresponding trimethylation products. The reaction may occur via an 18-electron pi-allyl intermediate, which undergoes facile reductive elimination to afford the geminal dimethylation product. Benzylic dithioacetals having an ortho amino group gave 2-isopropylanilines exclusively. The reaction of benzylic dithioacetals with EtMgBr under the same conditions yielded geminal diethylation products.