1,1′-OXALYLDIIMIDAZOLE, A NEW REAGENT FOR ACTIVATION OF CARBOXYLIC ACID
作者:Shizuaki Murata
DOI:10.1246/cl.1983.1819
日期:1983.12.5
Carboxylic acids and their salts are converted into the 1-acylimidazoles by the title reagent. This reaction is applied for esterification of fatty acids.
羧酸及其盐通过标题试剂转变为1-酰基咪唑。这一反应被应用于脂肪酸的酯化过程。
Reaction of Dicarbonates with Carboxylic Acids Catalyzed by Weak Lewis Acids: General Method for the Synthesis of Anhydrides and Esters
The reaction between carboxylic acids (RCOOH) and dialkyl dicarbonates [(R 1 OCO) 2 O], in the presence of a weak Lewis acid such as magnesium chloride and the corresponding alcohol (R 1 OH) as the solvent, leads to the esters RCOOR 1 in excellent yields. The mechanism involves a double addition of the acid to the dicarbonate, affording a carboxylic anhydride [(RCO) 2 O], R 1 OH and carbon dioxide
[EN] SYNTHESIS OF SMALL MOLECULES INSPIRED BY PHOMOXANTHONE A<br/>[FR] SYNTHÈSE DE PETITES MOLÉCULES SUSCITÉES PAR PHOMOXANTHONE A
申请人:WORCESTER POLYTECH INST
公开号:WO2022036040A1
公开(公告)日:2022-02-17
Methods, compositions, and kits are provided for synthesizing bioactive chromane, the method including: constructing a tertiary ether stereocenter enantioselectively by catalyzed alkynylation of a substituted chromenone to obtain a chromanone; reducing alkyne and ketone in the chromanone to obtain a chroman; and converting ester to methyl group thereby obtaining chromane.
Radical Cyanocarbonylation Using Alkyl Allyl Sulfone Precursors
作者:Sunggak Kim、Ilhyong Ryu、Sangmo Kim、Chang Ho Cho、Yoshitaka Uenoyama
DOI:10.1055/s-2005-921932
日期:——
Acyl cyanides have been prepared by the three-component coupling reactions comprised of alkyl allylsulfones, carbon monoxide, and p-tolylsulfonyl cyanide under tin-free radical reaction conditions.
酰基氰化物是由烷基烯丙基砜、一氧化碳和对甲苯磺酰氰在锡自由基反应条件下通过三组分偶联反应制备的。
Cycloaddition Reactions of Ketene Diethyl Acetal toward the Synthesis of Cyclobutene Monomers
作者:Carina S Kniep、Anne B Padias、H.K Hall
DOI:10.1016/s0040-4020(00)00354-9
日期:2000.6
The [2+2]-cycloaddition reactions of ketene diethylacetal with methyl acrylate and acrylonitrile were optimized. Highly efficient ketal cleavage to either 2-cyano-1-cyclobutanone or 2-methoxycarbonyl-1-cyclobutanone was achieved using formic acid. Among the numerous reduction methods attempted, only sodium cyanoborohydride in acidic medium led successfully to the corresponding alcohols, but isolation