Rhodium-Catalyzed Intramolecular Cyclopropanation of α-Diazo β-Keto Nitriles Containing an Unsaturated Substituted Cycloalkyl Group
作者:Jia-Liang Zhu、Yung-Peng Wu
DOI:10.1055/s-0036-1588174
日期:2017.7
α-diazo β-keto nitriles bearing trans-2-allyl-, -vinyl-, or -phenylcycloalkyl groups were prepared and their intramolecular cyclopropanation reactions were examined. In the presence of Rh2(OAc)4 (1 mol%) as a catalyst, the allyl- and vinyl-substituted precursors were found to undergo cyclopropanation smoothly at ambient temperature to afford novel tricyclic α-keto cyclopropyl nitriles in 47–88% yields
制备了几种带有反式-2-烯丙基-、-乙烯基-或-苯基环烷基的α-重氮β-酮腈,并研究了它们的分子内环丙烷化反应。在 Rh2(OAc)4 (1 mol%) 作为催化剂存在下,发现烯丙基和乙烯基取代的前体在环境温度下顺利进行环丙烷化,以 47-88% 的产率提供新型三环 α-酮基环丙基腈非对映体比例范围为 79:21 至 >99:1。另一方面,含苯基类似物的催化反应没有产生任何环丙基产物,而是以定量产率提供官能化的六氢菲或四氢环戊萘衍生物。