Gold(I)-Promoted Heterocyclization of Internal Alkynes: A Comparative Study of Direct Metallate <i>5-endo-dig</i> Cyclization versus a Stepwise Cyclization
作者:Jonathan M. French、Steven T. Diver
DOI:10.1021/jo500748e
日期:2014.6.20
additional normal alkylsubstituents at the propargylic position gave dehydropiperidines as the major product. This pathway is thought to proceed by way of a 1,2- Rautenstrauch rearrangement to produce a vinyl gold(I) carbene, which undergoes conjugate addition by the nitrogen pronucleophile. Structural and electronic factors were studied in the nitrogen pronucleophile and in the migrating acyloxy group. Each
One-pot nitro-Mannich/hydroamination cascades for the direct synthesis of 2,5-disubstituted pyrroles using base and gold catalysis
作者:David M. Barber、Hitesh Sanganee、Darren J. Dixon
DOI:10.1039/c1cc10751h
日期:——
An efficient, easy to perform, one-pot reaction cascade for the synthesis of 2,5-disubstituted pyrroles from p-toluenesulfonyl protected imines and 4-nitrobut-1-yne under a combination of base and gold(III) catalysis is reported.