tetramethylammonium methyl carbonate is effective as a catalyst for the chemoselective, scalable, and reusable transesterification of various esters and alcohols in common organic solvents. In situ-generated highly active species, tetramethylammonium alkoxides, can greatly avoid self-decomposition at ≤110 °C, and are reusable. In particular, chelating substrates, such as amino alcohols, diols, triols,
Conversion of esters and lactones to ethers via thionoesters and thionolactones using reductive radical desulfurization
作者:Doo Ok Jang、Seong Ho Song、Dae Hyan Cho
DOI:10.1016/s0040-4020(98)01156-9
日期:1999.3
Various thionoesters and thionolactones are readily reduced into the corresponding ethers in high isolated yields by radical desulfurization with organotin hydrides and Et3B under mild reaction conditions.
REDUCTIVE DEOXYGENATION OF ALCOHOLS VIA ESTERS WITH TRIPHENYLSILANE UNDER NEUTRAL CONDITIONS
作者:Hiroshi Sano、Mayako Ogata、Toshihiko Migita
DOI:10.1246/cl.1986.77
日期:1986.1.5
Treatment of carboxylic esters derived from alcohols with triphenylsilane in the presence of a radical generator at 140 °C gave the corresponding hydrocarbons in good yield.
在自由基产生剂的存在下,在 140 °C 下用三苯基硅烷处理衍生自醇的羧酸酯,以良好的收率得到相应的烃。
Selective mono-acylation of 1,2- and 1,3-diols using (α,α-difluoroalkyl)amines
作者:Natsumi Wakita、Shoji Hara
DOI:10.1016/j.tet.2010.08.029
日期:2010.10
3-diols, selective mono-benzoylation occurs to afford mono-esters of the diols in good yield. The reaction is completed under mild conditions in a short reaction time. Further, prim-, sec-, and tert-diols and catechol can be converted to the corresponding mono-benzoates. DFBA is used for the protection of the hydroxy group in sugars. The selective mono-nicotinylation, formylation and pivaloylation of diols
One-Pot Preparation of Esters from Carboxylic Acids Using the PPh<sub>3</sub>-CCl<sub>3</sub>CN System
作者:Doo Ok Jang、Dae Hyan Cho、Joong-Gon Kim
DOI:10.1081/scc-120022178
日期:2003.1.8
A convenient one-pot process for preparing various esters from carboxylic acids using the Ph3P-CCl3CN has been developed. Racemic a-tocopherol, clofibrate and flavoxate were prepared in high yields using this method.