Palladium-catalyzed and organozinc-promoted synthesis of dienes from allylic esters possessing an acyloxy or alkoxy group
摘要:
Organozinc and a Pd catalyst promoted formation of dienes from allylic esters possessing a leaving group such as acyloxy and alkoxy groups next to the allyl moiety. The reaction proceeded with high regio- and stereoselectivity when applied to secondary allylic substrates. (c) 2005 Elsevier Ltd. All rights reserved.
Homo- and cross-coupling involving alkenyl halides have been performed efficiently using an electroassisted nickel-complex catalysis. Valuable product such as conjugated dienes, beta,gamma- or gamma,delta-unsaturated esters, ketones, or nitriles, as well as alkenylated aryl compounds are thus prepared with high yields and high stereoselectivity. Partial isomerization is only observed in a few cases, when the alkenyl halide is involved in a late step of the catalytic cycle. This is the case in the preparation of (Z,Z)-1,3-diene.
NORIN, TORBJORN;UNELIUS, C. RIKARD, ACTA CHEM. SCAND., 44,(1990) N, C. 106-107
作者:NORIN, TORBJORN、UNELIUS, C. RIKARD
DOI:——
日期:——
Palladium-catalyzed and organozinc-promoted synthesis of dienes from allylic esters possessing an acyloxy or alkoxy group
Organozinc and a Pd catalyst promoted formation of dienes from allylic esters possessing a leaving group such as acyloxy and alkoxy groups next to the allyl moiety. The reaction proceeded with high regio- and stereoselectivity when applied to secondary allylic substrates. (c) 2005 Elsevier Ltd. All rights reserved.