Synthesis of 3-Amino-6-dimethylamino-4-oxopyrazolo[3,4-<i>d</i>] [1,3]oxazine Derivatives
作者:Richard Neidlein、Zhihua Sui
DOI:10.1055/s-1991-26538
日期:——
3-Amino-1-aryl-6-dimethylamino-4-oxo-1,4-dihydropyrazolo[3,4-d][1,3] oxazines 4a-7a and 3-amino-2-aryl-6-dimethylamino-4-oxo-2,4-dihydropyrazolo [3,4-d][1,3]oxazines 4b-6b were synthesized from 4-chloro-5-cyano-2-dimethylamino-6-oxo-6H-1,3-oxazine 2 and arylhydrazines in good yields. The substituent effect of the arylhydrazines on the yields of products was clearly observed.
Synthesis of Some 4-Chloro-5-cyano-2-dialkylamino-6<i>H</i>-1,3-oxazin-6-ones and their Reactions with Trialkyl Phosphites to Give Dialkyl (5-Cyano-2-dialkylamino-6-oxo-6<i>H</i>-1,3-oxazin-4-yl)phosphonates
作者:Richard Neidlein、Peter Meffert、Zhihua Sui
DOI:10.1055/s-1992-26129
日期:——
The reaction of the salts of alkyl dicyanoacetates and N-(dichloromethylene) dialkylammonium chlorides in chloroform leads to 4-chloro-5-cyano-2-dialkylamino-6H -1,3-oxazin-6-ones. The chloro atom of these compounds can be easily substituted in a Michaelis-Arbuzov reaction with trialkyl phosphites, giving dialkyl (5-cyano-2-dialkylamino-6-oxo-6-H-1,3-oxazin-4-yl)phosphonates in good yields.
Syntheses of New Heterocycles Starting from Dicyanoacetates
作者:Richard Neidlein、Peter Meffert
DOI:10.3987/com-94-s5
日期:——
The reactions of 4-chloro-2-dialkylamino-6-oxo-6H-1,3-oxazine-5-carbonitriles (3) with C-, N- and S-nucleophiles are reported. The chloro atom can also be substituted in a Michaelis-Arbuzov reaction giving the corresponding 1,3-oxazinyl phosphinates and phosphinoxides.
NEIDLEIN, RICHARD;SUI, ZHIHUA, SYNTHESIS (BRD),(1990) N0, C. 959-961
作者:NEIDLEIN, RICHARD、SUI, ZHIHUA
DOI:——
日期:——
Synthesis of 4-Chloro-5-cyano-2-dimethylamino-6<i>H</i>-1,3-oxazin-6-one from the Salts of Alkyl Dicyanoacetates and Some of Its Reactions
作者:Richard Neidlein、Zhihua Sui
DOI:10.1055/s-1990-27065
日期:——
The salts of alkyl dicyanoacetates and methyl 3-amino-3-chloro-2-cyanoacrylate react in chloroform with N-(dichloromethylene)dimethylammonium chloride to give 4-chloro-5-cyano-2-dimethyl- amino-6H,3-oxazin-6-one. The chloro atom of this compound can be easily substituted by alcohols or amines in good yield.