La 反应催化剂 par le palladium d'halogenures allyliques avec des reactifs aryl- etvinylstannanes donne des produits de copulation croisee。En存在 de monooxyde de carbone, des cetones sont obtenues, result d'une copulation croisee accompagnee d'une insert de CO. La反应 est douce et s'effectue meme en 存在 de differents fonctions (OH, OR, CN, CO 2 R , CHO) soit sur le le chlorure allylique soit sur le stannane
Highly stereoselective palladium-catalyzed coupling reactions of captodative olefins acetylvinyl arenecarboxylates
作者:Lourdes Villar、Joseph P. Bullock、Matheen M. Khan、Arumugam Nagarajan、Roderick W. Bates、Simon G. Bott、Gerardo Zepeda、Francisco Delgado、Joaquin Tamariz
DOI:10.1016/0022-328x(96)06112-8
日期:1996.6
The palladium-catalyzedreaction of the captodative olefin 3-(p-nitrobenzoyloxy)-3-buten-2-one (1a) with aryl and vinylhalides gave coupled products 4-aryl- and 4-vinyl-3-(p-nitrobenzoyloxy)-3-buten-2-ones, 4 and 6 respectively, with high Z stereoselection. (Ph3P)2PdCl2 also catalyzed cross-coupling alkylation, phenylation and vinylation with trialkylorganostannanes and bromo olefin (Z)-4-bromo-3
First enantioselective total synthesis of both enantiomers of lancifolol. Correlation: absolute configuration/specific rotation
作者:Jean-Marie Galano、Gérard Audran、Honoré Monti
DOI:10.1016/s0040-4039(01)01202-3
日期:2001.8
The first enantioselective total synthesis of bothenantiomers of lancifolol has been accomplished using a Z-stereoselective Peterson olefination and a palladium-catalyzed cross-coupling reaction as key steps. This approach allows us to correlate the relationship between absolute configuration and specific rotation, to date both unknown.
Palladium catalyzed coupling of organostannanes with vinyl epoxides
作者:David R. Tueting、Antonio M. Echavarren、J.K. Stille
DOI:10.1016/0040-4020(89)80010-9
日期:1989.1
The coupling reaction of organotin reagents with vinyl epoxides, catalyzed by palladium, takes place at ambient temperatures, regioselectively, giving predominately the 1,4-addition product. Both aryl- and vinylstannanes undergo coupling in high yields, while acetylenic, allylic and benzylic tin reagents either give low yields or fail to couple. Although the double bond geometry in the vinylstannane
Synthesis of γ-oxo α-amino acids from L-aspartic acid
作者:Alexander S. Golubev、Norbert Sewald、Klaus Burger
DOI:10.1016/0040-4020(96)00942-8
日期:1996.11
of different γ-oxo α-amino acids from hexafluoroacetone protected L-aspartic acid chloride 1 via Stille cross coupling reaction is described. Stille reaction of 1 with vinyltributyltin followed by Lewis acid catalyzed intramolecular Michael addition provides access to 4-substituted pipecolicacidderivatives. An efficient synthesis of 5-hydroxy-4-oxo-L-norvaline 7 and a new approach to the 4-oxo-L-ornithine
Palladium(II)-assisted difunctionalization of monoolefins: total synthesis of (+)-negamycin and (-)-5-epi-negamycin
作者:John J. Masters、Louis S. Hegedus
DOI:10.1021/jo00069a012
日期:1993.8
(+)-Negamycin and (-)-5-epi-negamycin were synthesized by a process involving the palladium-(II)-assisted alkylation of an optically active ene carbamate followed by carbonylative coupling to a trialkylvinyltin. The synthesis of (+)-negamycin was completed in 15 steps with an overall yield of 13%. The synthesis of (-)-5-epi-negamycin was completed in 12 steps with an overall yield of 20%. In preparing these compounds, a highly diastereoselective reduction of an unsaturated ketone and an efficient intramolecular Mitsunobu reaction were also carried out.