Cleavage of α-(phenylthio)alkylboranes with N-chlorosuccinimide. A convenient route to monothioacetals and acetals
作者:Abel Mendoza、Donald S. Matteson
DOI:10.1016/s0022-328x(00)84872-x
日期:1978.8
sulfur. Under free radical conditions, α-(phenylthio)alkaneboronic esters are cleaved to α-(phenylthio)alkyl chlorides by either N-chlorosuccinimide or sulfuryl chloride. Pinacol phenylthio(triphenylstannyl)methaneboronate with sulfuryl chloride yielded (phenylthio)dichloromethane, without any evidence of selectivity between carbontin and carbonboron bond cleavage.
可以通过两种不同的同源方法轻松制备的α-(苯硫基)烷基硼烷,由N-氯代琥珀酰亚胺在温和的碱性甲醇中脱硼,生成单硫缩醛或与过量的试剂二甲基乙缩醛。硼酸酯和三烷基硼烷都会发生反应,后者反应的速度要快得多。该反应对于硫取代的烷基硼烷基团是特定的,表明初始氯化发生在硫上。在自由基条件下,α-(苯硫基)链烷硼酸酯被N-氯代琥珀酰亚胺或磺酰氯裂解为α-(苯硫基)烷基氯。频哪醇苯硫基(三苯基锡烷基)甲烷硼酸酯与硫酰氯反应生成(苯硫基)二氯甲烷,没有任何证据表明碳锡和碳硼键裂解之间具有选择性。