Utilization of Sugars in Organic Synthesis. Part XXXI. Solvolytic Behaviors of O-Benzoyl, Cyclic O,O-Thionocarbonate, and O,S-Thiolcarbonate Groups in 3-0-Benzoyl-1,2-0-isopropylidene-.ALPHA.-D-glucofuranose Derivatives.
The transformation of acetonides into the corresponding diacetates is often required in the synthetic chemistry. An efficient procedure for direct conversion of acetonides into diacetates in the presence of Bi(OTf)3·xH2O under mild conditions has been developed. Primary hydroxyl-acetonides could be selectively transformed into diacetates in the presence of anomeric acetonides and the anomeric acetonides
在合成化学中通常需要将丙酮化物转化为相应的二乙酸盐。开发了一种在温和的条件下在Bi(OTf)3 · x H 2 O存在下将丙酮化物直接转化为二乙酸盐的有效方法。可以在异头丙酮化物的存在下将伯羟基丙酮化物选择性地转化为二乙酸盐,并且异头丙酮化物可以可调谐地转化为2-乙酰氧基异丙基或二乙酸盐基团。
The path of the conversion of 3,5,6-tri-O-benzoyl-1,2-O-isopropylidene-α-<scp>D</scp>-glucose into 4,5,6-tri-O-benzoyl-2,3-di-S-ethyl-2,3-dithio-<scp>D</scp>-allose diethyl dithioacetal
作者:G. S. Bethell、R. J. Ferrier
DOI:10.1039/p19720002873
日期:——
The reaction whereby 4,5,6-tri-O-benzoyl-2,3-di-S-ethyl-2,3-dithio-D-allose diethyldithioacetal can be obtained efficiently by direct ethanethiolysis of 3,5,6-tri-O-benzoyl-1,2-O-isopropylidene-α-D-glucose is shown to take place by way of 2-S-ethyl-2-thio-D-mannose intermediates. Migration of the 2-ethylthio-group to C-3 and of the 3-benzoyl substituent to C-4 follow, and an additional ethylthio-group