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
Organocatalytic asymmetric aza-Nazarov cyclization of an azirine
作者:Naoyuki Shimada、Bradley O. Ashburn、Ashok K. Basak、William F. Bow、David A. Vicic、Marcus A. Tius
DOI:10.1039/b927564a
日期:——
An unusual organocatalyticasymmetriccyclization of a ketoazirine that is accompanied by a kinetic resolution leads to 4-hydroxy-3-oxo-1,2,3,6-tetrahydropyridine-2-carboxylates in >99/1 er.