One-pot multi-substrate enantioselective conjugate addition of diethylzinc to nitroalkenes
作者:Ate Duursma、Adriaan J Minnaard、Ben L Feringa
DOI:10.1016/s0040-4020(02)00574-4
日期:2002.7
catalyzed enantioselectiveconjugateaddition of diethylzinc to nitroalkenes, using up to nine different nitroalkenes in a one pot procedure. The 18 products (9 times 2 enantiomers of nine different nitroalkanes) can be analyzed by chiral CG in a single run since on overlap in the peaks is observed. The obtained enantioselectivities are amongst the highest reported so far for the catalytic 1,4-addition
The copper-amidophosphane-catalyzed asymmetric addition reaction of dialkylzinc reagents with beta-aryl and beta-alkylnitroalkenes afforded the corresponding nitroalkanes with moderate to good enantioselectivities (54-80% ee). The performance was highly dependent on the reaction procedure where the addition of nitroalkene to the mixture of copper-amidophosphane and dialkylzinc gave higher ee than the addition of dialkylzinc to a mixture of copper-amidophosphane and nitroalkene. (c) 2005 Elsevier Ltd. All rights reserved.
Nitro olefins and organoaluminum compounds: a powerful synthetic tool in organic chemistry
作者:Angelo Pecunioso、Rita Menicagli
DOI:10.1021/jo00271a028
日期:1989.5
Efficient conjugate alkylation of .alpha.,.beta.-unsaturated nitro olefins by triorganoalanes
作者:Angelo Pecunioso、Rita Menicagli
DOI:10.1021/jo00236a012
日期:1988.1
METHOD AND APPARATUS FOR COMBINATORIAL CHEMISTRY
申请人:Foote S. Robert
公开号:US20070087367A1
公开(公告)日:2007-04-19
A method and apparatus are provided for performing light-directed reactions in spatially addressable channels within a plurality of channels. One aspect of the invention employs photoactivatable reagents in solutions disposed into spatially addressable flow streams to control the parallel synthesis of molecules immobilized within the channels. The reagents may be photoactivated within a subset of channels at the site of immobilized substrate molecules or at a light-addressable site upstream from the substrate molecules. The method and apparatus of the invention find particularly utility in the synthesis of biopolymer arrays, e.g., oligonucleotides, peptides and carbohydrates, and in the combinatorial synthesis of small molecule arrays for drug discovery.