ZrCl2(η-C5Me5)2-AlHCl2·(THF)2: efficient hydroalumination of terminal alkynes and cross-coupling of the derived alanes
作者:Philip Andrews、Christopher M. Latham、Marc Magre、Darren Willcox、Simon Woodward
DOI:10.1039/c2cc37537k
日期:——
with exceptional chemo-, regio- and stereoselectivity under efficient ZrCl(2)(eta-C(5)Me(5))(2) catalysis (2-5 mol%). The resulting vinyl alanes undergo palladium cross-coupling with a wide range of sp(2) electrophiles (aryl, heteroaryl and vinylhalides/pseudohalides) in good to excellent yields.
A silver-catalyzed carbomagnesiation of alkynes with alkyl halides and Grignardreagents afforded alkenyl Grignardreagentsregioselectively, where the alkyl group of the alkyl halide, but not that of the Grignardreagent, was introduced into the alkyne. Application to δ-haloalkylacetylenes yielded cyclopentanes or a tetrahydrofuran containing an exo-methylene substituent via 5-exo-dig cyclization
METAL-CATALYZED ASYMMETRIC 1,4-CONJUGATE ADDITION OF VINYLBORON COMPOUNDS TO 2-SUBSTITUTED-4-OXY- CYCLOPENT-2-EN-1-ONES YIELDING PROSTAGLANDINS AND PROSTAGLANDIN ANALOGS
申请人:Scinopharm Taiwan, Ltd.
公开号:EP3166918B1
公开(公告)日:2019-02-20
Heck reaction of aryl halides with linear or cyclic alkenes catalysed by a tetraphosphine/palladium catalyst
作者:Florian Berthiol、Henri Doucet、Maurice Santelli
DOI:10.1016/s0040-4039(02)02788-0
日期:2003.2
4-Tetrakis(diphenylphosphinomethyl)cyclopentane/[PdCl(C3H5)]2 system catalyses efficiently the Heck reaction of aryl halides with linear alkenes such as pent-1-ene, oct-1-ene or dec-1-ene. Selectivities up to 70% in favour of E-1-arylalk-1-ene isomers can be obtained. In the presence of cyclic alkenes the selectivities of the reactions strongly depends on the ring size. Addition to cyclohexene or cycloheptene led mainly
作者:Hayden A. Sharma、Katrina M. Mennie、Eugene E. Kwan、Eric N. Jacobsen
DOI:10.1021/jacs.0c08150
日期:2020.9.16
these rearrangement reactions, with the pathway depending on the identity of the migrating group. In reactions involving alkyl-group migration, intermolecular fluo-ride attack is product- and enantio-determining. In contrast, reactions in which aryl rearrangement occurs proceed through an enantiodetermining intramolecular1,2-migration prior to fluorination. The fact that both pathways are promoted by