Stereoselective Synthesis of Chiral 3-Aryl-1-alkynes from Bromoallenes and Heterocuprates
作者:Anna Maria Caporusso、Alessia Zampieri、Laura Antonella Aronica、Donatella Banti
DOI:10.1021/jo0522456
日期:2006.3.1
The synthesis of chiral 3-aryl-1-alkynes 3 via cross-coupling of 3-alkyl- and 3,3-dialkyl-1-bromo-1,2-dienes 1 and arylbromocuprates (RCuBr)MgBr·LiBr 2 was examined. With phenylcopper reagents and its para-substituted derivatives, as well as with 2-naphthyl cuprates, the reaction gave compounds 3 with high regioselectivity and good yields on the chemically pure product. On the contrary, when ortho-substituted
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.
Coupling of chiral 1-bromo-1,2-dienes with zinc-based cuprates: a new procedure for the regio and stereoselective synthesis of functionalized acetylenic compounds
作者:Anna Maria Caporusso、Sara Filippi、Federica Barontini、Piero Salvadori
DOI:10.1016/s0040-4039(99)02249-2
日期:2000.2
are found to be active in the cross-coupling reaction with allenic bromides affording acetylenic products with a high regio and stereoselective 1,3-anti substitution. The coupling process, which has been successfully extended to functionalized cuprates, can also be performed with alkylzinc chlorides in the presence of catalytic amounts of cuproussalts.