Synthetic applications of bis(iminophosphoranes). One-pot preparation of rigid bicyclic guanidines
摘要:
A one-pot synthesis of [6 + 6], [6 + 7], and [6 + 8] bicyclic guanidines based on a new method of dihydropyrimido annelation, which involves reaction of bis(iminophosphoranes) with aryl isocyanates or isothiocyanates is described. The method is also applicable for the preparation of chiral bicyclic guanidines.
Synthetic applications of bis(iminophosphoranes). One-pot preparation of rigid bicyclic guanidines
摘要:
A one-pot synthesis of [6 + 6], [6 + 7], and [6 + 8] bicyclic guanidines based on a new method of dihydropyrimido annelation, which involves reaction of bis(iminophosphoranes) with aryl isocyanates or isothiocyanates is described. The method is also applicable for the preparation of chiral bicyclic guanidines.
Stereocontrolled synthesis of azeto[2,1-b] quinazolines bearing three stereocenters via the intramolecular [2+2] cycloaddition between ketenimines and imines
作者:Mateo Alajarı́n、Angel Vidal、Fulgencio Tovar、M.Carmen Ramı́rez de Arellano
DOI:10.1016/j.tetasy.2003.11.025
日期:2004.2
A highly stereoselective synthesis of azeto[2,1-b]quinazolines bearing three stereocenters (C1, C2, and C8) has been achieved via intramolecular [2+2] cycloaddition between ketenimine and iminefunctions supported on an ortho-benzylic scaffold. An asymmetric center adjacent to the iminic nitrogen atom, the future C8 carbon of the bicyclic product, efficiently controls the absolute configuration of