Cobalt‐Catalyzed Intramolecular Reactions between a Vinylcyclopropane and an Alkyne: Switchable [5+2] Cycloaddition and Homo‐Ene Pathways
作者:Chunlin Wu、Naohiko Yoshikai
DOI:10.1002/anie.201803162
日期:2018.5.28
Cobalt–diphosphine catalysts have been found to promote intramolecular reactions between a vinylcyclopropane and an alkyne to selectively afford either the [5+2] cycloaddition product or the homo‐ene reaction product under solvent control. The former product is exclusively formed in noncoordinating 1,2‐dichloroethane, whereas the latter is dominant in coordinating solvents, such as acetonitrile and
已发现钴-二膦催化剂可促进乙烯基环丙烷与炔烃之间的分子内反应,从而在溶剂控制下选择性提供[5 + 2]环加成产物或均烯反应产物。前一种产品仅在非配位的1,2-二氯乙烷中形成,而后者在配位溶剂(如乙腈和二甲基乙酰胺)中占主导地位。此外,高烯键反应的高度对映选择性也提供了带有1,3-二烯和亚烷基取代基的手性四氢呋喃,吡咯烷和环戊烷衍生物。