Chemoselective deprotection and deprotection with concomitant reduction of 1,3-dioxolanes, acetals and ketals using nickel boride
作者:Jitender M. Khurana、Kiran Dawra、Purnima Sharma
DOI:10.1039/c4ra15404e
日期:——
An efficient and mild methodology for the reductive deprotection of 1,3-dioxolanes, acetals and ketals to the corresponding aldehydes/ketones and also deprotection with concomitant reduction to the corresponding alcohols has been achieved in quantitative yields using nickel boride generated in situ from nickel chloride and sodium borohydride in methanol. The reactions are chemoselective as halo, alkoxy
A Simple, Efficient and General Procedure for Acetalization of Carbonyl Compounds and Deprotection of Acetals under the Catalysis of Indium(III) Chloride
作者:Brindaban C. Ranu、Ranjan Jana、Sampak Samanta
DOI:10.1002/adsc.200303154
日期:2004.3
Indium(III) chloride efficiently catalyzes the protection of a variety of aldehydes and ketones to their corresponding 1,3-dioxolanes and dialkyl acetals in refluxing cyclohexane. On the other hand, deprotection of acetals is also achieved in refluxing aqueous methanol under the catalysis of indium(III) chloride.
A mild and efficient method for selective cleavage of ketals and acetals using lithium chloride in water - dimethyl sulfoxide
作者:Pijus Kumar Mandal、Pinak Dutta、Subhas Chandra Roy
DOI:10.1016/s0040-4039(97)01689-4
日期:1997.10
A mild and efficient neutral aqueous method for selective cleavage of acetals and ketals to the corresponding carbonyl compounds has been established by using LiCl in H2O-DMSO at elevated temperature. While aryl and α,β-unsaturated ketals and acetals underwent smooth cleavage, diaryl, non-aryl and isolated ketals and acetals remained unaffected under the reaction conditions.
作者:David J. Aldous、Anne J. Dalençon、Patrick G. Steel
DOI:10.1021/ol025569e
日期:2002.4.1
[reaction: see text] Epiasarinin, an endo-endo furofuran, has been synthesized from piperonal via a five-step route with good stereocontrol. The sequence involves Darzens condensation, alkenyl epoxide-dihydrofuran rearrangement, and a Lewis acid mediated cyclization.
Highly Efficient Transthioacetalization of O,O-Acetals Catalyzed by Indium(III) Chloride
作者:Brindaban C. Ranu、Arijit Das、Sampak Samanta
DOI:10.1055/s-2002-25347
日期:——
A simple, efficient and general procedure has been developed for the transthioacetalization of O,O-acetals catalyzed by indium(III) chloride in 1,2-dichloroethane.