The regioselective functionalization reaction of unprotected carbazoles with donor–acceptor (D–A) cyclopropanes has been demonstrated for the first time. With Sc(OTf)3 as Lewisacid catalyst, the N–H functionalization of carbazoles takes place through a highly selective nitrogen-initiated nucleophilic ring opening reaction. Significantly, by engaging TfOH as Brønsted acid catalyst, a straightforward
Rhodium(III)‐Catalyzed Direct C7 Allylation of Indolines via Sequential C−H and C−C Activation
作者:Qiuling Wang、Chang‐Lei Zhi、Pei‐Pei Lu、Shuang Liu、Xinju Zhu、Xin‐Qi Hao、Mao‐Ping Song
DOI:10.1002/adsc.201801496
日期:2019.3.15
A rhodium‐catalyzedC7 allylation of indolines with vinylcyclopropanes is reported via chelation‐assisted tandem C−H and C−C bond activation under mild conditions. A wide range of substrate proceeds smoothly to provide the allylated products in high yields with good functional group compatibility. Mechanistic studies reveal that the rhodacycle species is probably the key intermediate.
Improved process for the preparation of vinylcyclopropane derivatives
申请人:NATIONAL DISTILLERS AND CHEMICAL CORPORATION
公开号:EP0025846A1
公开(公告)日:1981-04-01
This invention provides a convenient and commercially adaptable process for the preparation of vinylcyclopropane derivatives in high yields. The process involves reacting an alkylating agent and an activated methylene compound in the presence of an onium compound, an alkali metal compound and water, which while only necessary in trace amounts can be present in substantial quantities.