Pyrimidine derivatives and related compounds. 38. Synthesis of 1,3-oxazine-2,4-diones and their reaction with nucleophiles. Ring transformation of 1,3-oxazines to pyrimidines
作者:Motoi Yogo、Kosaku Hirota、Shigeo Senda
DOI:10.1002/jhet.5570180607
日期:1981.10
the corresponding 6-chloro derivatives (1 and 2). Treatment of 6-chloro-3-methyl-1,3-oxazine-2,4-dione (1a) with sodium azide, sodium cyanide, secondary amines and aniline gave the corresponding 6-substituted compounds (7, 9, 10 and 11) while the reaction of 1a and 2a,b with primary aliphatic amines such as methylamine and ethylamine caused a ring transformation to pyrimidine ring system giving barbituric
Pyrimidine derivatives and related compounds. XLIII. Studies on the mechanism of the ring transformation of 6-chloro-1,3-oxazine-2,4-diones to barbituric acids.
作者:MOTOI YOGO、KOSAKU HIROTA、SHIGEO SENDA
DOI:10.1248/cpb.30.1333
日期:——
The mechanism of the ring transformation of 6-chloro-1, 3-oxazine-2, 4-diones (1) into barbituric acids (2) in the presence of primary aliphatic amines was studied. It has been elucidated that the mechanism involves initial attack on the 2-position of 1 by an amine and subsequent intramolecular cyclization of the ureide intermediate (5).
TRANSITION METAL-CATALYZED PROCESSES FOR THE PREPARATION OF N-ALLYL COMPOUNDS AND USE THEREOF
申请人:Rhodes Technologies
公开号:US20130102780A1
公开(公告)日:2013-04-25
The present disclosure provides processes for the N-dealkylation of tertiary amines and the use of transition metal catalysts to prepare tertiary N-allyl amine derivatives and secondary amine derivatives thereof. The tertiary amines can be alkaloids and, more particularly, the tertiary amines can be opioids. In specific embodiments, the present disclosure provides methods for use in processes for the synthesis of naloxone and naltrexone from oripavine.
COLORING COMPOSITION CONTAINING ISOINDOLINE COMPOUND AND USE OF SAME
申请人:TOYO INK SC HOLDINGS CO., LTD.
公开号:US20220213324A1
公开(公告)日:2022-07-07
A coloring composition which contains an isoindoline compound represented by formula (1) (wherein A represents a group that is expressed by formula (2), formula (3) or formula (4)) and a dispersion medium.