The title compoun\=a}s were prepared efficiently by Lewis acid catalyzed reaction of 1,2-bis(trimethylsiloxy)-1-cyclobutene with acetals, followed by addition of the Grignard reagent and ring cleavage of the resulting vis-diols with Pb(OAc)4.
在
路易斯酸催化下,1,2-双(三甲基
硅氧基)-1-
环丁烯与
乙醛发生反应,然后加入
格氏试剂,并用 Pb(OAc)4 对生成的粘二元醇进行环裂解,从而高效地制备出了标题化合物。