Structural Effects on the Rh<sup>II</sup>-Catalyzed Rearrangement of Cyclopropenes
作者:Paul Müller、Christian Gränicher
DOI:10.1002/hlca.19930760134
日期:1993.2.10
The thermocatalytic rearrangement of 2-alkylcycloprop-2-ene-1-carboxylates (1) in the presence of RhII perfluorobutyrate is regio- and stereospecific and leads to the substituted metallocarbenes 3. The latter undergo intramolecular CH bond insertion to form cyclopentylidenes (4). In contrast, the metallocarbenes 19, derived from 2,3-dialkylcycloprop-2-ene-1-carboxylates 6c, d, react to dienes (Z)-20
在Rh II全氟丁酸酯的存在下,2-烷基环丙-2-烯-1-羧酸盐(1)的热催化重排具有区域和立体特异性,并导致取代的金属碳烯3。后者经历分子内CH键插入以形成环戊叉基(4)。与此相反,metallocarbenes 19,衍生自2,3- dialkylcycloprop -2-烯-1-羧酸盐6C,d,反应二烯(Ž) - 20,经由1,2--H迁移。环丙二羧酸酯10又排他地重新排列为取代度更高的金属碳烯26,其环化成呋喃28,随着6E,和12,从开环的两种模式衍生的产物中观察到。