Benzyl ether protected polyhydroxylated alkene compounds containing allylic alcohol, ether or ester functionality undergo a stereospecific cyclisation reaction upon treatment with TFA-acetonitrile-toluene with inversion of configuration at the allylic position and loss of a benzyl ether to give tetrahydrofurans.
用TFA-
乙腈-
甲苯处理后,含有烯丙基醇,醚或酯官能团的苄基醚保护的多羟基化烯烃化合物经历立体有择的环化反应,其中烯丙基位置上的构型反转并且苄基醚损失而得到
四氢呋喃。