The synthesis and analgesic properties of thiazolo [4, 5-f] morphans (XIIa-c) are described. Monothiazolization of ethyl 2-methyl-1, 3-dioxo-2-cyclohexaneacetate (I) afforded the 2-aminothiazole derivative (II), which was deaminated to ethyl 4, 5, 6, 7-tetrahydro-4-methyl-5-oxo-4-benzothiazoleacetate (V) by means of the Sandmeyer reaction and subsequent hydrogenolysis of the resulting chloride (IVa). In several steps, V was converted to 2, 5-dimethyl-9-oxothiazolo [4, 5-f] morphan (X). Thiazolo [4, 5-f] morphan derivatives (XIIa-c) were synthesized from this key intermediate (X).
本文介绍了
噻唑并[4,5-f]
吗喃(XIIa-c)的合成和镇痛特性。将 2-甲基-1,3-二氧代-2-
环己烷乙酸乙酯(I)单
噻唑化后得到
2-氨基噻唑衍
生物(II),通过桑德迈尔反应将其脱
氨为 4,5,6,7-四氢-4-甲基-5-氧代-
4-苯并噻唑乙酸乙酯(V),随后将得到的
氯化物(IVa)进行氢解。经过几个步骤,V 被转化为 2,5-二甲基-9-氧代
噻唑并 [4,5-f]
吗喃(X)。
噻唑并 [4, 5-f]
吗啡衍
生物(XIIa-c)就是由这个关键的中间体(X)合成的。