Twisted Amides as Selective Acylating Agents for Hydroxyl Groups under Neutral Conditions: Models for Activated Peptides during Enzymatic Acyl Transfer Reaction
摘要:
The highly twisted amide 2 served as a selective acylating agent; for dials under neutral conditions. The reaction of primary-secondary dials with 2 led to the corresponding primary alkyl monopivalates. For dials containing alcoholic and phenolic hydroxyl groups, alcoholic hydroxyl groups were selectively acylated under neutral conditions, whereas, the opposite selectivity was observed under basic conditions, similar to the cases using acyl halides or acid anhydrides. Although 1 and 3 were unreactive to alcohols, 5-10 having substituent groups at C-4 were reactive to alcohols to give the corresponding acetates or benzoates.
Selective pivaloylation of Hydroxyl Groups by 3-Pivaloyl-1,3-thiazolidine-2-thione Under Neutral Conditions
作者:Shinji Yamada
DOI:10.1016/0040-4039(92)88169-6
日期:1992.4
conditions, 3-pivaloyl-1,3-thiazolidine-2-thione (PTT) was found to act as a selective pivaloylating reagent for hydroxyl groups. The primary hydroxyl groups of diols containing primary and secondary hydroxyl groups, and the phenolic hydroxyl groups of the diols having alcoholic and phenolic hydroxyl groups were selectively pivaloylated by PTT.
Twisted Amides as Selective Acylating Agents for Hydroxyl Groups under Neutral Conditions: Models for Activated Peptides during Enzymatic Acyl Transfer Reaction
The highly twisted amide 2 served as a selective acylating agent; for dials under neutral conditions. The reaction of primary-secondary dials with 2 led to the corresponding primary alkyl monopivalates. For dials containing alcoholic and phenolic hydroxyl groups, alcoholic hydroxyl groups were selectively acylated under neutral conditions, whereas, the opposite selectivity was observed under basic conditions, similar to the cases using acyl halides or acid anhydrides. Although 1 and 3 were unreactive to alcohols, 5-10 having substituent groups at C-4 were reactive to alcohols to give the corresponding acetates or benzoates.