Gold(I)-Catalyzed Enantioselective Ring Expansion of Allenylcyclopropanols
作者:Florian Kleinbeck、F. Dean Toste
DOI:10.1021/ja904055z
日期:2009.7.8
The asymmetric gold(I)-catalyzedring expansion of 1-allenylcyclopropanols is described. The method provides synthetically valuable cyclobutanones with a vinyl-substituted quaternary stereogenic center in high enantioselectivities and yields. The method shows a broad substrate scope, tolerating protected alcohols and amines, alkenes, unsaturated esters, and acetals. The reaction is easily adjustable
Coupling and Cyclization of <i>o</i>-Iodoanilines and Propargylic Bromides via Allenes: An Efficient Entry to Indomethacin
作者:Can Zhu、Shengming Ma
DOI:10.1021/ol401115a
日期:2013.6.7
sequential allene synthesis and cyclization has been realized in a one-pot manner. A Pd(0)-catalyzed one-pot reaction of N-Ts or -Ms 2-iodoanilines and propargylic bromides afforded indoles with pharmaceutical importance highly efficiently with diversity via sequential carbon–carbon bond coupling forming allenes and azapalladation. With this newly established methodology, an efficient approach to indomethacin