Diastereoselective Synthesis of Cyclododeca-1,6-diallenes ( = cyclododeca-l,2,6,7-tetraenes)
作者:Christoph Boss、Reinhart Keese
DOI:10.1002/hlca.19970800207
日期:1997.3.24
The synthesis of substituted cyclododeca-1,6-diallenes.( = cyclododeca-1,2,6,7-tetraenes) from cyclododeca-5,11-diyne-1,4-diols is described (Schemes 1 and 3). The ca. 1:1 mixtures of the stereoisomers of the cyclododeca-1,6-diallenes were formed in high yields from the ca. 1:1 diastereoisomer mixtures of the 1,4-disubstituted cyclododeca-5,11-diynes by reactions with Me2CuLi or t-BuMgCl/CuII. In mechanistically
描述了由环十二烷基5,11-二炔-1,4-二醇合成取代的环十二烷基-1,6-二烯丙基(=环十二烷基-1,2,6,7-四烯)(方案1和3)。的ca。从ca.1中以高收率形成环十二烷基-1,6-二烯丙基的立体异构体的1∶1混合物。通过与Me 2 CuLi或t -BuMgCl / Cu I反应的1,4-二取代的环十二烷基-5,11-二炔的1:1非对映异构体混合物I.在用1,4-二甲基环十二烷基-5,11-二炔-1,4-二醇的纯非对映异构体进行的机械相关实验中,证明了在这些反应中该构型是保守的。仅带有一个炔丙基离去基团的1-取代的环十二烷基-2,8-二炔的首次合成使得能够获得混合的12元艾伦-炔基(方案5)。