Synthesis of 1-bromo-1,4-dienes via palladium-catalyzed bromoallylation of alkynes
摘要:
An efficient procedure for the synthesis of a series of 1-bromo-1,4-dienes by a simple Pd-catalyzed intermolecular tandem reaction of alkynes, CuBr2, and allylic alcohol has been developed. The reaction proceeds smoothly under mild condition to give the corresponding products in good to excellent yields. (C) 2013 The Authors. Published by Elsevier Ltd. All rights reserved.
A two step procedure as improved alternative to the cyclocarbonylation of allyl halides and acetylene derivatives mediated by Ni(CO)4
作者:F. Camps、J. Coll、A. Llebaria、J.M. Moretó
DOI:10.1016/s0040-4039(00)82199-1
日期:1988.1
by Pd(II) complexes, such as bis-acetonitrile palladium(II) bromide, followed by cyclocarbonylation of the resulting adducts with Ni(CO)4 in CH3CN containing precise amounts of CH3OH and Et3N is a better procedure than the direct cyclocarbonylation of these substrates mediated by Ni(CO)4 for preparation of cyclopentenones, specially for monosubstituted acetylenes or weakly polarized disubstituted acetylenes
Ni-promoted Cyclopentenone Formation by Intramolecular Cyclocarbonylation of 1-Bromo-1,4-dienes
作者:Amadeu Llebaria、Francisco Camps、Josep Ma Moretó
DOI:10.1016/s0040-4020(01)85818-x
日期:1993.2
the formation of 1-bromo-1,4-dienes which were further converted to cyclopentenones through a Ni(CO)4 promoted carbonylation-cyclization process. Four CC bonds are formed by this two step sequence, leading to 2,3-substituted 5-methoxycarbonylmethylcyclopentenones 1. Application of this procedure to 2-butyne affords cyclopentenone 1c, an immediate precursor of the antibiotic methylenomicyn B.
Palladium-catalyzed inter- and intramolecular cross-coupling reactions of B-alkyl-9-borabicyclo[3.3.1]nonane derivatives with 1-halo-1-alkenes or haloarenes. Syntheses of functionalized alkenes, arenes, and cycloalkenes via a hydroboration-coupling sequence
Multifunctional Palladium Catalysis. 2. Tandem Haloallylation Followed by Wacker−Tsuji Oxidation or Sonogashira Cross-Coupling
作者:Avinash N. Thadani、Viresh H. Rawal
DOI:10.1021/ol0269603
日期:2002.11.1
graphicMultifunctional palladium catalysis is utilized in the one-pot stereocontrolled synthesis of tetrasubstituted methyl ketones and enynes. The homogeneous palladium dihalide catalyst utilized for the bromo-/chloroallylation of alkynes is reused in situ for subsequent Wacker-Tsuji oxidation or Sonogashira cross-coupling.