N-Bromosuccinimide-dibenzoyl peroxide/azabisisobutyronitrile: a reagent for Z- to E-alkene isomerization
作者:Md.Merajuddin Baag、Anirban Kar、Narshinha P Argade
DOI:10.1016/s0040-4020(03)01054-8
日期:2003.8
N-Bromosuccinimide-dibenzoyl peroxide/azobisisobutyronitrile is used to carry out several types of Z- to E-alkene isomerizations. The NBS-bromination conditions are sufficient for both allylic bromination and alkene isomerization. When the allylic hydrogens are not available in substrates, only the isomerization of the alkene takes place. The present conditions for isomerization of carbon-carbon double bonds are mild and efficient. (C) 2003 Elsevier Ltd. All rights reserved.
Reductive Elimination of Bromine from 2,3-Disubstituted 1,4-Dibromo-2-butenes by Iodide Ion: A Convenient Route to 2,3-Bis[iodomethyl]-1,3-butadiene and Related Compounds
作者:David P. G. Hamon、Paul R. Spurr
DOI:10.1055/s-1981-29625
日期:——
HAMON, D. P. G.;SPURR, P. R., SYNTHESIS, BRD, 1981, N 11, 873-874
作者:HAMON, D. P. G.、SPURR, P. R.
DOI:——
日期:——
Ru-Catalyzed Asymmetric Hydrogenative/Transfer Hydrogenative Desymmetrization of Meso-Epoxy Diketones
Via a strategy of asymmetricreductive desymmetrization, chiral cis-epoxy naphthoquinols with multiple contiguous stereocenters and functional groups were synthesized with excellent enantioselectivities (96–99% ee) and diastereoselectivities (8/1–15/1). A combined asymmetric hydrogenation/transfer hydrogenation mechanism was proposed based on experimental results.