Rhodium-catalyzed carbonyl allylations by allylic alcohols with tin(II) chloride
作者:Yoshiro Masuyama、Yusuke Kaneko、Yasuhiko Kurusu
DOI:10.1016/j.tetlet.2004.10.051
日期:2004.11
Rhodium complexes such as [RhCl(cod)]2, [Rh(cod)2]BF4, and [Rh(cod)(CH3CN)2]BF4 function as catalysts for carbonylallylations by allylicalcohols with 1 equimolar amount of tin(II) chloride to each allylicalcohol and aldehyde in THF at 50 °C to produce the corresponding homoallylic alcohols.
diastereoselective. The allylation of benzaldehyde by 1-chlorobut-2-ene in 1,3-dimethylimidazolidin-2-one (DMI) does not occur with tin(II) chloride or bromide but does proceed with tin(II) iodide and exhibits gamma-syn selectivity which is unusual for a Barbier-type carbonylallylation. In the carbonylallylation by 1-chlorobut-2-ene with any tin(II) halide, the addition of tetrabutylammoniumiodide (TBAI) accelerates
[EN] PROCESSES FOR HIGHLY ENANTIO-AND DIASTEREOSELECTIVE SYNTHESIS OF ACYCLIC EPOXY ALCOHOLS AND ALLYLIC EPOXY ALCOHOLS<br/>[FR] PROCEDES DE SYNTHESE HAUTEMENT ENANTIOSELECTIVE ET DIASTEREOSELECTIVE D'EPOXYALCOOLS ACYCLIQUES ET D'EPOXYALCOOLS ALLYLIQUES
申请人:UNIV PENNSYLVANIA
公开号:WO2005087755A1
公开(公告)日:2005-09-22
The inventive subject matter relates to novel processes for making an epoxy alcohol from an aldehyde, comprising the steps of: (a) adding (i) an organozinc compound or (ii) divinylzinc compound and an diorganozinc compound to said aldehyde in the presence of a first catalyst to form an allylic alkoxide compound; and (b) epoxidizing said allylic alkoxide compound in the presence of an oxidant and a second catalyst.
Iridium-Catalyzed Carbonyl Allylations by Allylic Alcohols with Tin(II) Chloride
作者:Yoshiro Masuyama、Toshiya Chiyo、Yasuhiko Kurusu
DOI:10.1055/s-2005-872255
日期:——
Iridium complex [IrCl(cod)] 2 can function as a catalyst for the allylation of aldehydes and ketones by allylicalcohols upon addition of an equimolar amount of SnCl 2 in THF-H 2 O; the reaction is carried out between roomtemperature and 50 °C to give the corresponding homoallylic alcohols.
铱络合物[IrCl(cod)] 2 可作为烯丙醇烯丙基化醛和酮的催化剂,在THF-H 2 O中加入等摩尔量的SnCl 2 ;反应在室温和 50 °C 之间进行,得到相应的高烯丙醇。
α-Regioselective carbonyl allylation by an allylic tin compound prepared from 1-bromobut-2-ene and tin(<scp>II</scp>) bromide at a nonpolar organic–aqueous interface
1-Bromobut-2-ene on a dichloromethane–water biphasic system at 25 °C causes α-regioselective addition to aldehydes with SnBr2 to produce 1-substituted pent-3-en-1-ols, and causes γ-regioselective addition to aldehydes with SnBr2–Bu4NBr to produce 1-substituted 2-methylbut-3-en-1-ols.