Modular and Highly Stereoselective Approach to All-Carbon Tetrasubstituted Alkenes
作者:Vladislav Kotek、Hana Dvořáková、Tomáš Tobrman
DOI:10.1021/ol503624v
日期:2015.2.6
A modular and completely stereoselectiveapproach for the construction of all-carbon tetrasubstituted alkenes is described. It is based on the three-fold, sequential metal-catalyzed, cross-coupling functionalization of simple enolphosphate dibromide templates with carbon nucleophiles, affording tetrasubstituted alkenes as single isomers.
reports the synthesis of cyclobutene derivatives in good yields via the [2 + 2] cycloaddition between lithium ynolates and α,β-unsaturated carbonyls. The ynolates are generated fromα,α,α-tribromomethyl ketones and tert-butyl lithium via a simple and novel method, which does not produce any harmful byproducts, such as lithium alkoxide, which induces a polymerization reaction with α,β-unsaturated carbonyls