Synthesis of 7-Substituted 5-Oxo-5<i>H</i>-thiazolo[3,2-<i>a</i>]pyrimidine-6-carboxylic Acids, 2-Substituted 4-Oxo-4<i>H</i>-pyrido [1,2-<i>a</i>]pyrimidine-3-carboxylic Acids, and 2,6-Disubstituted 4-Quinolones from Meldrum's Acid Derivatives
作者:Fang-Chen Ye、Bang-Chi Chen、Xian Huang
DOI:10.1055/s-1989-27241
日期:——
The title compounds are prepared from the Meldrum acid derivatives 5-[bis(methylthio)methylene]-, 5-(1-methylthioalkylidene)- and 5-(α-methylthiobenzylidene)-2,2-dimethyl-4,6-dioxo-1,3-dioxanes by reaction with 2-aminothiazole, 2-aminopyridine, or anilines, respectively.
Preparation of Resin-Bound Bismethylene Cyclic Malonic Acid Ester and Facile Solid-Phase Synthesis of 2-Alkylthio-4(1<i>H</i>)-quinolone and 2-Alkyl-4(1<i>H</i>)-quinolone
作者:Jing Tang、Xian Huang
DOI:10.1081/scc-120026320
日期:2003.12
The resin-bound bismethylthiomethylene cyclic malonic acid ester 3 was built up efficiently. Resin 3 can react with arylamines and subsequent thermal cyclizations give 2-alkylthio-4-(1H)-quinolones. Furthermore, conjugate addition of Grignard reagents to the resin 3 forms the resin 6 which was reacted with arylamines and subsequent thermal-cyclization-cleavages afford the 2-alkyl-4-(1H)-quinolones.
YE, FANG-CHEN;CHEN, BANG-CHI;HUANG, XIAN, SYNTHESIS (BRD),(1989) N, C. 317-320
作者:YE, FANG-CHEN、CHEN, BANG-CHI、HUANG, XIAN
DOI:——
日期:——
Tang, Jing; Huang, Xian, Journal of Chemical Research - Part S, 2003, # 3, p. 140 - 141