Synthesis of (<i>E</i>)-3-Alkylidene-1-pyrrolines by the Rhodium- Catalyzed Cyclization of Terminal Alkynes with Homopropargylic Amines
作者:Yoshiya Fukumoto、Takuya Kawahara、Yukinori Kanazawa、Naoto Chatani
DOI:10.1002/adsc.200900439
日期:2009.10
The cyclization of terminal alkynes with homopropargylic amines in the presence of a rhodium complex as catalyst leads to the formation of (E)-3-alkylidene-1-pyrrolines. The reaction tolerates a wide range of functional groups on the terminal alkynes. The formation of a vinylidene-rhodium complex, followed by the intermolecular nucleophilic attack of a homopropargylic amine nitrogen on the α-carbon
在铑配合物作为催化剂的存在下,末端炔与高炔丙基胺的环化导致形成(E)-3-亚烷基-1-吡咯啉。该反应可耐受末端炔烃上的各种官能团。作为催化反应中的关键步骤,提出了亚乙烯基-铑配合物的形成,随后高炔丙基胺氮对亚乙烯基-铑配合物的α-碳原子的分子间亲核攻击。