Studies on 3,5-dioxopiperidines and related compounds: Synthesis of 5-(3-tert-butylamino-2-hydroxy)propoxy-1,2,3,4-tetrahydro-2-oxo-1,7-naphthyridine.
作者:YASUMITSU TAMURA、CHING LING CHEN、MASANOBU FUJITA、HIROSHI KIYOKAWA、YASUYUKI KITA
DOI:10.1248/cpb.29.2460
日期:——
The 7-aza analog (1·HCl) of 5-(3-tert-butylamino-2-hydroxy) propoxy-3, 4-dihydrocarbostyril·hydrochloride (2·HCl, carteolol·HCl) was prepared as part of a search for new adrenergic receptor antagonists. Thermal treatment of 1-acetyl-3-benzylamino-5-oxo-3, 4-dehydropiperidine (3), derived from N-acetylpiperidine-3, 5-dione (4a) by treatment with acryloyl chloride, gave 7-acetyl-1-benzyl-2, 5-dioxo-1, 2, 3, 4, 5, 6, 7, 8-octahydro-1, 7-naphthyridine (7). Dehydrogenation of 7 on 5% palladium carbon, and subsequent reductive debenzylation with liquid ammonia and sodium gave 5-hydroxy-1, 2, 3, 4-tetrahydro-2-oxo-1, 7-naphthyridine (5). Alkylation of 5 with epichlorohydrin, treatment with alkali and amination with tert-butylamine gave 5-(3-tert-butylamino-2-hydroxy)-propoxy-1, 2, 3, 4-tetrahydro-2-oxo-1, 7-naphthyridine·hydrochloride (1·HCl) in 45% overall yield from 5.
5-(3-叔丁基氨基-2-羟基)丙氧基-3,4-二氢-2-氧代-1,7-萘啶·盐酸盐(1·HCl)的7-氮杂类似物(1·HCl)是作为寻找新的肾上腺素能受体拮抗剂的一部分而制备的。1-乙酰基-3-苄基氨基-5-氧代-3,4-脱氢哌啶(3)由N-乙酰基哌啶-3,5-二酮(4a)与丙烯酰氯反应而得,经热处理后得到7-乙酰基-1-苄基-2,5-二氧代-1,2,3,4,5,6,7,8-八氢-1,7-萘啶(7)。在5%钯碳上对7进行脱氢,然后用液氨和钠还原脱苄得到5-羟基-1,2,3,4-四氢-2-氧代-1,7-萘啶(5)。用环氧氯丙烷对5进行烷基化,用碱处理,用叔丁胺胺化,从5得到5-(3-叔丁