在准备 une serie de cyclobuta [de] naphtalenes fonctionnalises。On montre que les衍生du cyclobuta [de]naphtalene et du methylene-1 cyclobuta [de]naphtalene presentent un interet comme produits de de de synthese
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 Novel Approach to the Practical Synthesis of Sulfides: An InBr<sub>3</sub>-Et<sub>3</sub>SiH Catalytic System Promoted the Direct Reductive Sulfidation of Acetals with Disulfides
Chiral Phosphoric Acid Catalyzed Highly Enantioselective Desymmetrization of 2-Substituted and 2,2-Disubstituted 1,3-Diols via Oxidative Cleavage of Benzylidene Acetals
作者:Shan-Shui Meng、Yong Liang、Kou-Sen Cao、Lufeng Zou、Xing-Bang Lin、Hui Yang、K. N. Houk、Wen-Hua Zheng
DOI:10.1021/ja507332x
日期:2014.9.3
A highly enantioselective catalytic protocol for the desymmetrization of a wide variety of 2-substituted and 2,2-disubstituted 1,3-diols is reported. This reaction proceeds through the formation of an "ortho ester" intermediate via oxidation of 1,3-diol benzylidene acetal by dimethyldioxirane (DMDO) and the subsequent proton transfer catalyzed by chiral phosphoric acid (CPA). The mechanism and origins
Stepwise Reduction of Acetals to the Corresponding Hydrocarbons. A Mild and Effective Transformation via Carbinyl Bromides
作者:Takeshi Oriyama、Yuichi Ichimura、Gen Koga
DOI:10.1246/bcsj.64.2581
日期:1991.8
Stepwise reduction of two alkoxyl groups in acetal was effected by the action of triethylsilane along with acetyl bromide and SnBr2 and then of tributyltin hydride (or lithium aluminium hydride) providing methyl or methylene compounds in good yields under very mild conditions.
Copper(II) tetrafluoroborate as a novel and highly efficient catalyst for acetal formation
作者:Raj Kumar、Asit K. Chakraborti
DOI:10.1016/j.tetlet.2005.09.168
日期:2005.11
Commercially available copper(II) tetrafluoroborate hydrate has been found to be a highly efficient catalyst for dimethyl/diethyl acetal formation in high yields from aldehydes and ketones by reaction with trimethyl/triethyl orthoformate at room temperature and in short period. Acetalisation was carried out under solvent-free conditions with electrophilic aldehydes/ketones. For weakly electrophilic