The anomeric hydroxyl group of various pyranose hemiacetals can be esterified with inversion of configuration, conveniently, mildly and on large-scale using triphenylphosphine (TPP), with either diisopropylazodicarboxylate (DIAD) or diethylazodicarboxylate (DEAD) and a carboxylic acid in THF at either −50° C or at room temperature.
各种
吡喃糖
半缩醛的异头羟基可以使用
三苯基膦(
TPP),
偶氮二甲酸二异丙酯(
DIAD)或
偶氮二甲酸二乙酯(
DEAD)和
羧酸在THF中的构型反转,方便,温和且大规模地酯化- 50°C或在室温下。