Synthesis and properties of 3-chloro- and 3,7-dichloro-3,4-dihydro-1-hydroxycarbostyrils and related heterocyclic compounds
作者:T. J. McCord、C. E. DuBose、P. L. Shafer、A. L. Davis
DOI:10.1002/jhet.5570210303
日期:1984.5
3-Chloro- and 3,7-dichloro-3,4-dihydro-1-hydroxycarbostyrils were synthesized by the catalytic hydrogenation of the α-chloro- and α,4-dichloro-β-(o-nitrophenyl)propionic acids in strong acidic solution over platinum-on-carbon sulfided catalyst. However, the catalytic hydrogenation of α-bromo-β-(o-nitrophenyl)propionic acid yielded 3,4-dihydro-1-hydroxycarbostyril under the same experimental conditions
通过在强浓度下对α-氯-和α,4-二氯-β-(邻硝基苯基)丙酸进行催化加氢合成了3-氯和3,7-二氯-3,4-二氢-1-羟基咔唑碳/铂硫化催化剂上的酸性溶液。然而,在相同的实验条件下,α-溴-β-(邻-硝基苯基)丙酸的催化加氢反应生成了3,4-二氢-1-羟基卡替丁。在温和的碱性溶液中对3-氯-3,4-二氢-1-羟基卡斯蒂尔和α-氯-β-(邻硝基苯基)丙酸进行轻松的脱氯化氢,得到1-羟基卡斯蒂尔和o-硝基肉桂酸。通过在铂黑催化剂上在盐酸中催化加氢,将3-氯-3,4-二氢-1-羟基卡斯蒂尔和1-羟基卡斯蒂尔选择性还原成相应的内酰胺3-氯-3,4-二氢卡斯蒂尔和咔唑。取代的羧甲苯乙烯衍生物的结构与其质子核磁共振谱相关。