Practical and Chemoselective Reduction of Acyl Chloride to Alcohol by Borohydride in Aqueous Dichloromethane
作者:Ramya Rajan、Sachin Badgujar、Kamaljit Kaur、Yashwardhan Malpani、Pranab R. Kanjilal
DOI:10.1080/00397910903340645
日期:2010.8.31
simple methodology for the reduction of acid chlorides to their correspondingalcohols has been developed. Various carboxylicacids were converted to alcohols in excellent yields using NaBH4-K2CO3 in a mixed solvent system of dichloromethane and water (1:1) in the presence of a phase-transfer catalyst at low temperature. The importance of the work is its simplicity, selectivity, excellent yield, and very
decades of development, carbonylation reactions have become one of the most powerful tools in modern organic synthesis. However, the requirement of CO gas limits the applications of such reactions. Reported herein is a versatile and practical protocol for carbonylativereactions which rely on the cooperation of phenyl formate and nonaflate, and the generation of CO in situ. This protocol has a high functional‐group
A General and Efficient Palladium-Catalyzed Alkoxycarbonylation of Phenols To Form Esters through In Situ Formed Aryl Nonaflates
作者:Xiao-Feng Wu、Helfried Neumann、Matthias Beller
DOI:10.1002/chem.201103797
日期:2012.3.26
Esters made easy! A general and efficient methodology for the palladium‐catalyzed alkoxycarbonylation of in situ formed aryl nonaflates has been developed (see scheme). Both homo‐ and cross‐esterifications are possible. DPPF=1,1′‐bis(diphenylphosphino)ferrocene.
Direct Synthesis of Symmetrical Azines from Alcohols and Hydrazine Catalyzed by a Ruthenium Pincer Complex: Effect of Hydrogen Bonding
作者:Jonathan O. Bauer、Gregory Leitus、Yehoshoa Ben-David、David Milstein
DOI:10.1021/acscatal.6b02946
日期:2016.12.2
Herein, we present a directsynthesis of azines from alcohols and hydrazine hydrate. The reaction, catalyzed by a rutheniumpincercomplex, evolves dihydrogen and can be run in a base-free version. The dehydrogenativecoupling of benzylic and aliphatic alcohols led to good conversions and yields. Spectroscopic evidence for a hydrazine-coordinated dearomatized rutheniumpincercomplex was obtained. Isolation
undivided cell, of Ph3P in the presence of a carboxylic acid in CH2Cl2 containing 2,6-lutidinium perchlorate as the supporting electrolyte was shown to generate the corresponding acyloxyphosphonium ion, Ph3P+-OCOR, which was converted in situ to esters, amides, and β-lactams under mild conditions.
结果表明,在羧酸存在下的CH 2 Cl 2中,含高氯酸2,6-lut啶鎓作为辅助电解质的PH 3 P在不分隔的电池中恒流电解会生成相应的酰氧基phosph离子Ph 3 P + -OCOR,在温和条件下原位转化为酯,酰胺和β-内酰胺。