PROCESSES FOR THE PREPARATION OF 5-HYDROXY-3-OXOPENTANOIC ACID DERIVATIVES
申请人:KANEKA CORPORATION
公开号:EP1104750A1
公开(公告)日:2001-06-06
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 °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 °C or above.