A General Method for the Preparation of 5-Trifluoromethylated Oxazoles from .ALPHA.-Amino Acids.
作者:Masami KAWASE、Hiroshi MIYAMAE、Teruo KURIHARA
DOI:10.1248/cpb.46.749
日期:——
The reactions of N-acyl-N-benzyl-α-amino acids (1) or N-acylprolines (5) with trifluoroacetic anhydride in the presence of pyridine afford 5-trifluoromethyloxazoles (2 or 7) in good yields. The reaction could proceed through the transient formation of mesoionic 1, 3-oxazolium-5-olates, followed by oxazolium salts.
A new grape variety distinguished by its high vigour, circular shaped leaves, medium weight fruit clusters, early-medium harvesting time (end of August in northeastern Italy), green dorsal and ventral internodes, and resistance to downy mildew and powdery mildew.
Peptides, process for preparing the same and psychodepressant
申请人:Amano Pharmaceutical Co., Ltd
公开号:US04517180A1
公开(公告)日:1985-05-14
This invention provides a peptide represented by the formula R--Tyr(SO.sub.3 H)--Met--Gly--Trp--Met--Asp--W--NH.sub.2 wherein R is HOOC--A--CO--Asp-- (wherein A is lower alkylene), pGlu--Asp--, HOOC--A--CO-- (wherein A is lower alkylene) or ##STR1## and W is Phe or N.sup..alpha. -lower alkyl-Phe, or a salt thereof, process for preparing the peptide and psychodepressant composition containing the peptide. The peptides of the invention are useful as psychodepressant drug, and especially effective for curing schizophrenia.