Selective transamidation of 3-oxo-N-acyl homoserine lactones by hydrazine derivatives
作者:Michael A. Bertucci、Stephen J. Lee、Michel R. Gagné
DOI:10.1039/c4ob01156b
日期:——
Hydrazine derivatives are employed for selective amide cleavage of 3-oxo-N-acyl homoserine lactones under physiologically relevant conditions.
在生理条件下,利用肼衍生物对3-氧代-N-酰基蛋氨酸内酯进行选择性酰胺裂解。
Method of producing 1-alkyl-3-aryl-5-difluoromethoxy-ih-pyrazoles
申请人:——
公开号:US20040059128A1
公开(公告)日:2004-03-25
The invention relates to a method of Aryl preparing 1-alkyl-3-aryl-5-difluoromethoxy-1H-pyrazoles of the formula (I), wherein aryl represents a mono- or polysubstituted phenyl ring, and R
1
represents C
1
-C
4
alkyl. The inventive method is characterized by reacting, in a first reaction step, a &bgr;-ketoester of the general formula (II) with hydrazine and by successively reacting the reaction product obtained with chlorodifluoromethane and a compound R
1
-L, wherein R
1
has the meanings indicated above and L represents the leaving group of a nucleophilic displacement reaction.
1