As a new protective group for diols, cyclic oxalates [trans-1,2-cyclo-hexane diol 1,2-oxalate (1), 1,2:5,6-di-O-isopropylidene-D-mannitol 3,4-oxalate (2) and 1,2-propanediol 1,2-oxalate (3)] were synthesized by using oxalyl chloride, ethyloxalyl chloride, diethyl oxalate and oxalic acid. Cyclic oxalates were readily cleaved to the corresponding diols by various bases such as sodium methoxide, potassium carbonate, 1 % sodium hydroxide, triethylamine and lithium aluminium hydride, but were stable in acid.
Preparation and Reaction of Cyclic Oxalate of Diols
作者:Kwan Soo Kim、Eun Young Hurh、Kyutae Na、Dai-Il Chung
DOI:10.1080/00397919108021596
日期:1991.12
Abstract Cyclic oxalates were efficiently prepared by the reaction of diols with ethyl oxalyl chloride in the presence of triethylamine. They were stable under acidic conditions but cleaved to diols under basic conditions.