Cyclobutene Formation in PtCl<sub>2</sub>-Catalyzed Cycloisomerizations of Heteroatom-Tethered 1,6-Enynes
作者:Zhenjie Ni、Laurent Giordano、Alphonse Tenaglia
DOI:10.1002/chem.201403643
日期:2014.9.8
Aza(oxa)bicyclo[3.2.0]heptenes are accessed through the PtCl2‐catalyzed cycloisomerizations of heteroatom‐tethered 1,6‐enynes featuring a terminal alkyne and amide as the solvent. It is shown that the weak coordinating properties of the solvent and alkyl substituent(s) at the propargylic carbon atom favor the formation of cyclobutenes instead of other possible cycloisomerization products such as 1
氮杂(氧杂)双环[3.2.0]庚烯可通过杂原子系留的1,6-烯炔的PtCl 2催化的环异构化反应来获得,端炔和酰胺为溶剂。结果表明,在炔丙基碳原子上,溶剂和烷基取代基的弱配位性质有利于环丁烯的形成,而不是其他可能的环异构化产物,例如1,3-二烯衍生物或环丙烷稠合的杂环。