Regio- and Stereoselectivity of the Addition of <i>O</i>-, <i>S</i>-, <i>N</i>-, and <i>C</i>-Nucleophiles to the β Vinyl Oxirane Derived from <scp>d</scp>-Glucal
作者:Valeria Di Bussolo、Micaela Caselli、Maria Rosaria Romano、Mauro Pineschi、Paolo Crotti
DOI:10.1021/jo048981b
日期:2004.12.1
6-O-Trityl- (1a) and 6-(O-benzyl)-substituted epoxide (1b) derived from d-glucal were examined in their addition reactions with O-, C-, N-, and S-nucleophiles. A 1,4-regio- and β-stereoselective or an anti 1,2-addition pathway is commonly observed depending on the ability of the nucleophile to coordinate with the oxirane oxygen. When TMSN3 or LiN3 are used as azide-based nucleophiles, a 1,2-syn-addition
在与O-,C-,N-和S-亲核试剂的加成反应中,研究了衍生自d-葡糖醛的6- O -Trity1-(1a)和6-(O-苄基)-取代的环氧化物(1b)。通常根据亲核体与环氧乙烷氧配位的能力观察到1,4-区域和β-立体选择性或抗1,2-加成途径。当将TMSN 3或LiN 3用作基于叠氮化物的亲核试剂时,还会观察到1,2-syn加成途径。