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 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.
Simple and efficient MW-assisted cleavage of acetal and ketal is proposed in deionized water and in a very short time.
提出了在去离子水中并在很短的时间内简单有效地进行MW辅助的乙缩醛和缩酮的裂解。
Simple and Efficient Chemoselective Mild Deprotection of Acetals and Ketals Using Cerium(III) Triflate
作者:Renato Dalpozzo、Antonio De Nino、Loredana Maiuolo、Antonio Procopio、Antonio Tagarelli、Giovanni Sindona、Giuseppe Bartoli
DOI:10.1021/jo0260387
日期:2002.12.1
A new and chemoselective method for the cleavage of alkyl and cyclic acetals and ketals at room temperature in wet nitromethane by using catalytic cerium(III) trifluoromethane sulfonate is presented. The high yields, the observed selectivity, the very gentle reaction conditions, and the almost neutral pH make this procedure particularly attractive for multistep synthesis.
Oxidative Deprotection of Silylethers, Acetals and Ketals by Oxygen or Air in Presence of Manganese and Cobalt Salts of 4-Aminobenzoic Acid Supported on Silica Gel as Catalyst
作者:Mohammed M. Hashemi、Fariba Kalantari
DOI:10.1080/00397910008087231
日期:2000.4
Abstract Oxidative deprotection of silylethers, acetals and ketals to their corresponding alcohols, aldehydes and ketones have been achieved using oxygen or air in the presence of cobalt and manganese salts of 4-aminobenzoic acid supported an silica gel as catalysts. Reactions are clean and catalysts can be recovered easily and reused repeatedly.