A new cascade three-component process for high trans,trans-diastereoselective assembly of five-membered (1-halovinyl)lactones has been developed. The process is based on reactions of substituted methylidenemalonates and cyclopropanedicarboxylates with 3-haloprop-1-ynes in the presence of GaHal3 and involves the intermediate in situ generation of 1,2-zwitterionic gallium complexes with [Ga(L)3]3+[GaX4–]3
已经开发出一种新的级联三组分工艺,用于五元(1-卤代戊基)内酯的高反式,反式-非对映选择性组装。该方法基于在GaHal 3存在下取代的亚
甲基丙二酸酯和
环丙烷二
羧酸酯与3-卤代丙-1-炔的反应,涉及中间体中间原位生成具有[Ga(L)3 ] 3+的1,2-两性离子
镓络合物的过程。[GaX 4 – ] 3组成。可以成功获得
氯,
溴和
碘衍
生物。我们开发的过程的机械和立体
化学方面已得到研究和详细考虑。