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    • 4. 发明授权
    • Preparation of C22-alkyl derivative of digoxin
    • 地高辛C22烷基衍生物的制备
    • US3981862A
    • 1976-09-21
    • US558381
    • 1975-03-14
    • Wolfgang VoigtlanderFritz KaiserWolfgang SchaumannKurt Stach
    • Wolfgang VoigtlanderFritz KaiserWolfgang SchaumannKurt Stach
    • C07J19/00
    • C07J19/005
    • A process for the preparation of a C22-alkyl-derivative of digoxin of the formula ##SPC1##In whichR.sub.1 is an alkyl radical containing up to 4 carbon atoms,R.sub.2 and R.sub.3 are selected from the group consisting of hydrogen, acyl, benzyl, carbobenzoxy, trimethylsilyl, tetrahydropyranyl or phosphonoacyl radicals or together form an alkylidene radical,Comprising reacting a compound of the formula ##SPC2##With an alkyl iodide of the formula R.sub.1 I in the presence of a strongly polar aprotic solvent and an alkali metal hydride. If R.sub.2 and R.sub.3 are other than hydrogen they can subsequently be replaced by hydrogen by hydrolysis or hydrogenation. The product can be .alpha.- or .beta.-methylated to produce compounds of high resorption and low toxicity.
    • 制备式IN的地高辛的C22-烷基衍生物的方法,其中R1是含有至多4个碳原子的烷基,R2和R3选自氢,酰基,苄基,苄氧羰基,三甲基甲硅烷基 ,四氢吡喃基或膦酰基基团或一起形成亚烷基,在强极性非质子溶剂和碱金属氢化物的存在下,将式I化合物与式Ia化合物反应。 如果R2和R3不是氢,那么它们随后可以通过水解或氢化被氢代替。 该产物可以是α-甲基化或β-甲基化以产生高吸收和低毒性的化合物。