作者:Ashok K. Basak、Naoyuki Shimada、William F. Bow、David A. Vicic、Marcus A. Tius
DOI:10.1021/ja103028r
日期:2010.6.23
An organocatalytic asymmetric Nazarov cyclization of diketoesters that proceeds by means of a dual activation mechanism has been developed. Screening of a number of catalysts led to a new thiourea that incorporates a primary amino group. The method gives rise to cyclic products with two adjacent quaternaryasymmetriccarbon atoms, one of which is an all-carbon stereocenter, with complete or nearly
Anion-accelerated asymmetric Nazarov cyclization: access to vicinal all-carbon quaternary stereocenters
作者:Cody F. Dickinson、Glenn P. A. Yap、Marcus A. Tius
DOI:10.1039/d3ob00735a
日期:——
We have developed a catalytic asymmetric Nazarov cyclization that results in the formation of two contiguous all-carbon quaternarystereocenters in high yield with excellent levels of asymmetric induction. This method requires no catalyst recognition elements in the starting materials that are simple diketoesters. Geometrically pure E or Z isomers of the starting material lead to diastereomerically