Stereocontrolled sequential functionalization in acyclic systems by exploiting internal 1,2-asymmetric induction — generation of symmetry-related polyamino alcohol motifs
作者:Stephen Hanessian、Wengui Wang、Yonghua Gai
DOI:10.1016/0040-4039(96)01754-6
日期:1996.10
Treatment of acyclic γ-ureido α,β-unsaturated esters with lithium dialkyl or diaryl cuprates leads to the corresponding β,γ-substituted esters with high syn-stereoselectivity. The potassium enolates of these compounds react with trisyl azide or the Davis oxaziridine reagent to give all syn-orientated α-azido esters, or α-hydroxy esters. Mitsunobu inversion with azide ion produces diastereomeric compounds
A Convenient and Efficient Workup of Ozonolysis Reactions Using Triethylamine
作者:Yung-Son Hon、Sheng-Wun Lin、Yao-Jung Chen
DOI:10.1080/00397919308011249
日期:1993.6
Comparison were made between triethylamine and methyl sulfide for their use as a quenching agent in the ozonolysis of a variety of alkenes. The reactions involving triethylamine often gave better yields and proceeded faster than those of involving methyl sulfide. The role of triethylamine played as base instead of reducing agent in the reaction.