Palladium-catalyzed intramolecular addition of amines to acetylenes. Synthesis of cyclic imines
摘要:
Intramolecular aminopalladation of alkynylamines gave intermediary alkenylpalladium compounds that hydrolyzed and isomerized to thermodynamically stable cyclic imines. Treatment of 3-alkynylamines with a catalytic amount of PdCl2(MeCN)2 gave exclusively 1-pyrrolines in good yields; 5-alkynylamines afforded 2,3,4,5-tetrahydropyridines selectively. Treatment of 4-alkynylamines with Pd(II) afforded mixtures of both 5- and 6-membered cyclic imines. Applications to the synthesis of some naturally occurring alkaloids are also described.
An efficienttandemcatalysis method is achieved for the direct conversion of alcohol-containing alkynyl anilines to valuable chiral 2,3-fused tricyclic indoles. This method relies on a tandem indolization followed by enantioconvergent substitution of alcohols via borrowing hydrogen to construct two rings in one step, enabled by relay and cooperative catalysis of a chiral iridium complex with a chiral
SELECTIVE OXIDATION OF C-H BONDS OF MODIFIED SUBSTRATES BY P450 MONOOXYGENASE
申请人:Li Shengying
公开号:US20120190635A1
公开(公告)日:2012-07-26
The present invention provides regio- and stereoselective oxidation of unactivated C—H bonds using an engineered mutant cytochrome P450 monooxygenase and an engineered substrate.