Metal catalysis in organic reactions. 17. A nickel-promoted route to substituted allenes by reaction of 1-bromo-1,2-dienes with alkyl metals.
作者:Anna Maria Caporusso、Federico Da Settimo、Luciano Lardicci
DOI:10.1016/s0040-4039(01)80863-7
日期:1985.1
Nickel complexes are found to be catalytically active in the cross-coupling reactions of allenic bromides with alkyl metals to give substitutedallenes in excellent yields. The catalytic process proceeds generally with inversion of configuration in the allenyl moiety.
Reactions of 3-alkyl- and 3,3-dialkyl-1-bromoallenes with organocuprates: Effects of the nature of the cuprate reagent on the regio- and stereoselectivity
作者:Anna Maria Caporusso、Carmela Polizzi、Luciano Lardicci
DOI:10.1016/s0040-4039(00)96867-9
日期:1987.1
Organocuprates induce 1,3- and direct substitution in 3-alkyl- and 3,3-dialkyl-1-bromo-1,2-dienes leading respectively to either terminal acetylenes or allenic hydrocarbons. The nature of the cuprate exerts a prominent role in determining both the regio- and the stereochemistry of these reactions.
Allenes. Part XXVII. Reaction of dialkyl(lithio)copper reagents with 1-bromoallenes, 1-iodoallenes, and 3-chloroalk-1-ynes
作者:Michael Kalli、Phyllis D. Landor、Stephen R. Landor
DOI:10.1039/p19730001347
日期:——
Allenichydrocarbons are obtained in high yield by the reaction of 1-halogenoallenes or 3-chloroalk-1-ynes with dialkyl(lithio)copper reagents at low temperature.
Cycloaddition reactions of allenes with N-phenylmaleimide. A two-step, diradical-intermediate process
作者:Daniel J. Pasto、Peter F. Heid、Steven E. Warren
DOI:10.1021/ja00377a022
日期:1982.6
e process. The stereochemical features controlling the formation of the stereoisomeric diradical intermediates and their ring closures are discussed. In addition to the cycloaddition processes, competitive ene reactions occur to produce intermediate dienes, which react further to produce 1:2 adducts or nonreactive alkyne-containing 1:1adducts. These ene reactions also appear to proceed via diradical
Intermolecular rhodium catalyzed hydroacylation of allenes: the regioselective synthesis of β,γ-unsaturated ketones
作者:Helen E. Randell-Sly、James D. Osborne、Robert L. Woodward、Gordon S. Currie、Michael C. Willis
DOI:10.1016/j.tet.2009.03.054
日期:2009.6
A variety of β-S-substituted aldehydes undergo efficient and regioselectiverhodiumcatalyzedhydroacylation reactions with 1,3-disubstituted and 1,1,3-trisubstituted allenes, to deliver β,γ-unsaturated ketone products. Regioselectivites are controlled primarily by steric factors. The reactions are catalyzed by the complex [Rh(dppe)]ClO4.