Silica gel catalysed generation of episulfonium ions: a mild method for the synthesis of heterocycles
作者:Lorenzo Caggiano、David J. Fox、Stuart Warren
DOI:10.1039/b207542n
日期:2002.10.18
β-Carbonyloxy sulfides fragment when heated with silica or alumina to produce reactive episulfonium ion intermediates. Intramolecular activation of the leaving group and concurrent protection of a nitrogen or oxygen nucleophile via a cyclic carbamate or carbonate leads to the formation of pyrrolidines or cyclic ethers.
β-羰氧基硫化物在与二氧化硅或氧化铝一起加热时会发生碎片,生成反应性环鎓离子中间体。离去基团的分子内活化和氮或氧亲核试剂通过环状氨基甲酸酯或碳酸酯的同时保护导致吡咯烷或环状醚的形成。