PROCESSES FOR THE PREPARATION OF 5-HYDROXY-3-OXOPENTANOIC ACID DERIVATIVES

摘要

Processes by which 5-hydroxy-3-oxopentanoic acid derivatives useful as intermediates of drugs can be prepared from inexpensive and easily available raw materials under noncryogenic conditions. Specifically, a process for preparing 5-hydroxy-3-oxopentanoic acid derivatives by making lithium amide act on a mixture of an acetic acid ester and a 3-hydroxypropionic acid derivative at a temperature of -20 DEG C or above; and another process for preparing 5-hydroxy-3-oxopentanoic acid derivatives by treating a mixture of an acetic acid ester and a 3-hydroxypropionic acid derivative with a Grignard reagent and then making lithium amide act on the resulting mixture at a temperature of -20 DEG C or above.