The Sulfone Linker in Solid-Phase Synthesis: Preparation of 3,5-Disubstituted Cyclopent-2-enones
作者:Wei-Chieh Cheng、Mark J. Kurth
DOI:10.1021/jo0256843
日期:2002.6.1
The preparation of functionalized 3,5-disubstituted cyclopent-2-enones via a solid-phase sulfone linker strategy is described. Polystyrene/divinylbenzene sulfinate 1 underwent S-alkylation followed by alpha,alpha-dialkylation with cis-1,4-dichloro-2-butene to form polymer-bound 3-phenylsulfonylcyclopentenes 8. Subsequent epoxidation of the cyclopentene moiety in 8 was accomplished by treatment of mCPBA
描述了通过固相砜接头策略制备官能化的3,5-二取代的环戊-2-烯酮。聚苯乙烯/二乙烯基苯亚磺酸盐1进行S-烷基化,然后与cis-1,4-二氯-2-丁烯进行α,α-二烷基化反应,形成聚合物结合的3-苯基磺酰基环戊烯8。随后通过处理实现8中环戊烯部分的环氧化在mCPBA中,用各种亲核试剂,即格氏试剂和铜酸盐试剂,叠氮化物离子和胺将树脂9中的环氧乙烷环打开。为了完成基于砜的接头策略,将Swern或TPAP氧化10生成一个瞬时的γ-酮砜,将其亚磺酸盐消除,从而裂解了砜接头。十一点三分