作者:Yun-Young Kim
DOI:10.14233/ajchem.2014.16373
日期:——
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.
作为新型二醇保护基,合成了环草酸盐 [trans-1,2-环己烷二醇1,2-草酸盐 (1)、1,2:5,6-二-O-异丙烯基-D-甘露醇3,4-草酸盐 (2) 和1,2-丙二醇1,2-草酸盐 (3)],反应物包括草酰氯、乙氧草酰氯、二乙氧草酸和草酸。环草酸盐可以通过多种碱性试剂(如甲氧基钠、碳酸钾、1%氢氧化钠、三乙胺和氢化铝锂)轻易裂解为相应的二醇,但在酸性环境中则保持稳定。