Palladium-catalyzed cross-coupling of N-benzenesulfonyl-3,4-dibromopyrrole and its application to the total syntheses of lamellarins O, P, Q, and R
作者:Tsutomu Fukuda、Ei-ichi Sudo、Kozue Shimokawa、Masatomo Iwao
DOI:10.1016/j.tet.2007.10.105
日期:2008.1
Palladium-catalyzed Suzuki-Miyaura Coupling of N-benzenesulfonyl-3,4-dibromopyrrole with a variety of arylboronic acids gave the corresponding 3,4-diarylpyrroles in high yields. The 3,4-differentially arylated pyrroles could also be prepared by stepwise cross-coupling approach. The total syntheses of lamellarins O, P, Q, and R have been achieved by using the cross-coupling and the directed lithiation as key reactions. (c) 2007 Elsevier Ltd. All rights reserved.