2-Halobenzyl 1-alkynyl sulfides undergo an unprecedented dihydrothiophene formation when treated with 2 equiv. of KOtBu in CH3CN. The reaction, believed to proceed via a 5-endo-dig cyclization, is sluggish or non-existent in the absence of the halogen.
当用2当量处理时,2-卤代苄基1-炔基
硫化物经历前所未有的二氢
噻吩形成。CH 3 CN中KO t Bu的摩尔数。据信该反应是通过5-内挖-环化进行的,在没有卤素的情况下反应缓慢或不存在。