Regioselective Catalytic Hydroboration of Propargylic Species Using Cu(I)-NHC Complexes
摘要:
The catalytic regioselective hydroboration of propargylic alcohols and ethers was investigated using NHC-CuCl. We observe that different NHC-CuCl complexes catalyze hydroborations of propargylic substrates with opposite regioselectivity. A 6-NHC-CuCl complex provides alpha-selectivity whereas beta-selectivity is achieved using a 5-NHC-CuCl complex. The reaction tolerates a wide range of functional groups.
A new method for the preparation of 3,5-disubstituted butenolides
作者:Stephen L. Buchwald、Qun Fang、Susan M. King
DOI:10.1016/0040-4039(88)85185-2
日期:1988.1
A convenient method for the transformation of suitably protected propargyl alcohols into 3,5disubstiuted butenolides has been developed. This organozirconium-based method transforms optically active propargyl alcohols into the corresponding butenolides with no loss of optical activity.