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    • 37. 发明申请
    • Process for the preparation of 4,4-dimethyl-6-ethynylthiochroman
    • 制备4,4-二甲基-6-乙炔基二氢苯并噻喃的方法
    • US20050240029A1
    • 2005-10-27
    • US11158856
    • 2005-06-22
    • Bobba Venkata KumarVishvas PatilChangdev RautShekhar BhirudBatchu Chandrasekhar
    • Bobba Venkata KumarVishvas PatilChangdev RautShekhar BhirudBatchu Chandrasekhar
    • C07D335/06C07D335/04A61K31/382
    • C07D335/06
    • An improved process for the preparation of key intermediates for tazarotene, 4,4-dimethyl-6-ethynylthiochroman, is provided comprising (a) reacting 4,4-dimethyl-6-acetylthiochroman of the formula with an acid chloride and an amido-group containing compound of the general formula wherein R is hydrogen or a hydrocarbyl of from 1 to 15 carbon atoms and R1 and R2 can be the same or different and are hydrocarbyls of from 1 to 15 carbon atoms or R1 and R2 together with the nitrogen atom to which they are bonded are joined together to form a heterocyclic group, optionally containing one or more additional heterocyclic atoms, or one of R1 and R2 together with the nitrogen atom to which it bonded are joined together with the carbonyl radical to form a heterocyclic group, optionally containing one or more additional heterocyclic atoms to form a chloro vinyl carbonyl compound intermediate of the general formula wherein R has the aforestated meanings; and (b) reacting the β-chloro vinyl carbonyl compound intermediate with an alkali metal to provide the 4,4-dimethyl-6-ethynylthiochroman.
    • 提供了一种用于制备他扎罗汀4,4-二甲基-6-乙炔基二氢苯并噻喃的关键中间体的改进方法,其包括(a)使下式的4,4-二甲基-6-乙酰基二氢苯并二氢吡喃与酰氯和酰氨基 其中R是氢或1至15个碳原子的烃基,R 1和R 2可以相同或不同,并且是烃基的通式 1至15个碳原子或R 1和R 2与它们所键合的氮原子一起连接在一起形成杂环基,任选地含有一个或多个 另外的杂环原子或R 1和R 2中的一个与其键合的氮原子一起与羰基连接在一起形成杂环基,任选地含有 一个或多个另外的杂环原子以形成通式的氯乙烯基羰基化合物中间体,其中R具有af ;意 和(b)使β-氯乙烯基羰基化合物中间体与碱金属反应,得到4,4-二甲基-6-乙炔基二氢苯并噻喃。