A facile synthesis of aryldihydropyrans using a Sonogashira–selenoetherification strategy
作者:Margaret A Brimble、Gabrielle S Pavia、Ralph J Stevenson
DOI:10.1016/s0040-4039(02)00065-5
日期:2002.2
with a range of phenyl and naphthyl bromides affords the appropriate aryl acetylenic alcohols which then undergo ready reduction to the corresponding (E)-1-aryl-5-hydroxyalkenes. Subsequent selenoetherification of the (E)-5-hydroxyalkenes proceeds via a 6-endo-trig pathway cleanly affording the trans-2-aryl-3-phenylselenyltetrahydropyrans. Finally oxidative elimination of the selenides afforded the 2-aryl-2
据报道,高产率且方便地合成2-芳基-2,5-二氢-2 H-吡喃。4-戊炔-1-醇和5-己炔-2-醇与一定范围的苯基和萘基溴的Sonogashira偶联产生适当的芳基炔醇,然后将其立即还原成相应的(E)-1-芳基-5-羟基烯烃。(E)-5-羟基烯烃的随后的醚醚化通过6-内-trig途径进行,干净地得到反式-2-芳基-3-苯基硒基四氢吡喃。最后氧化消除硒化物,得到2-芳基-2,5-二氢-2 H-吡喃,它们是合成C的方便中间体-芳基糖苷含有双键,可用于进一步的氧合。