Tuning the reactivity of organotin(IV) by LiOH: allylation and propargylation of epoxides via redox transmetalation
摘要:
In presence of catalytic Pd(0) or Pt(II), a reagent combination of SnCl2-LiOH promotes the reaction of organic halides and epoxides in dichloromethane leading to the regioselective formation of corresponding homoallyl and homopropargyl alcohols in good yields. This 2-carbon extension strategy adds to the repertoire of Barbier reactions via metal salts and reinforces views on the enhanced reactivity of organotin having -OH pendant. (c) 2004 Elsevier B.V. All rights reserved.
Barbier reaction in the regime of metal oxide: the first example of carbonyl allylation mediated by tetragonal tin(ii) oxide
作者:Pradipta Sinha、Sujit Roy
DOI:10.1039/b104500h
日期:——
Facile synthesis of homoallylic alcohols is achieved from allyl halides and aldehydes or ketones over an all-oxide heterogenous media involving beta-SnO and catalytic Cu2O.
Highly efficient water promoted allylation and propargylation of arylepoxides via rearrangement-carbonyl addition
作者:Ujjal Kanti Roy、Sujit Roy
DOI:10.1016/j.tet.2005.10.005
日期:2006.1
A simple and highly efficient one-pot procedure for allylation and propargylation of arylepoxides has been developed. A combination of SnCl2 and catalytic Pd(0) or Pd(II) promotes the reaction of organic halides and epoxides in DMSO with controlled water addition, leading to the regioselective formation of the corresponding homoallyl and homopropargyl alcohols in good yields. (c) 2005 Elsevier Ltd. All rights reserved.