Diastereoselective reactions between oxazolidines and organolithiumreagents afford β-amino alcohols having chiral vinyl and alkynylsilane moieties. A meaningful change of regioselectivity, from the α- to the γ-position, occurred when these reactions were performed in the presence of titanium isopropoxide, since allyl and allenylsilane derivatives were thus produced.
A stereospecific synthesis of both enantiomers of 2-(1′-amino-2′-methylpropyl) imidazole, a key synthon in the synthesis of SB 203386; a potent protease inhibitor
作者:Lendon N Pridgen、Mohamed K Mokhallalati、Michael A McGuire
DOI:10.1016/s0040-4039(97)00070-1
日期:1997.2
Two methods for the asymmetric synthesis of both enantiomers of 2-(1′-amino-2′-methylpropyl)imidazole (2) have been developed by adding nucleophilic organometallics to nonracemic 2-oxazolidinones employing 2-phenylglycinol as the source of chirality. Excellent stereochemical yields were obtained.
GraphicsAmino alcohols, having an enol ether function, cyclized in acidic medium to give quantitatively diastereosomerically pure bicyclic compounds that were transformed in five steps in enantiopure trans-5-alkylproline derivatives.