Synthesis and desilylation of (2R,3S)-α-methyl-α-silyl-α,β-2,3-dihydroxycarboxylic methyl esters
                                
                                    
                                        作者:Arturo Battaglia、Eleonora Baldelli、Gaetano Barbaro、Patrizia Giorgianni、Andrea Guerrini、Magda Monari、Simona Selva                                    
                                    
                                        DOI:10.1016/s0957-4166(02)00440-8
                                    
                                    
                                        日期:2002.8
                                    
                                    Addition reactions of the chiral lithium (2S)-enolates of the (2S,5S)-2-tert-butyl-5,-methyl-[1,3]dioxolan-4-one and (2S,5S)-2-tert-butyl-2,5-dimethyl-[1,3]dioxolan-4-one with linear aliphatic acylsilanes yield the corresponding (2S,5R,1'R)-1'-trimethylsilyl-dioxolanone alcohols. Sodium methoxide-induced removal of the acetal center at C-2 affords the corresponding methyl (2R,3R)-2,3-dihydroxy-2-methyl-3-trimethylsilyl alkanoates. The desilylation of these esters occurs with complete retention of configuration yielding the corresponding (2R,3S)-2,3-dihydroxy-2-methyl-alkanoic acids. (C) 2002 Elsevier Science Ltd. All rights reserved.