【药物名称】
化学结构式(Chemical Structure):
参考文献No.32693
标题:2-Substd. aryl pyrroles, compsns. containing such cpds. and methods of use
作者:De Laszlo, S.E.; Mantlo, N.B.; Ponticello, G.S.; Selnick, H.G.; Liverton, N.J. (Merck & Co., Inc.)
来源:EP 0863757; JP 1999510510; US 5792778; WO 9705877
合成路线图解说明:

N-(Benzyloxycarbonyl)isonipecotic acid (I) was activated as the acid chloride (II) employing oxalyl chloride in the presence of a catalytic amount of DMF. Addition of diazomethane to acid chloride (II) produced the intermediate diazo ketone (III) which, upon treatment with an ethereal solution of HCl, led to the chloromethyl ketone (IV).

合成路线图解说明:

Acylation of the lithium derivative of 4-picoline (VI) with the Weinreb amide of 4-fluorobenzoic acid (V) yielded ketone (VII). The sodium enolate of (VII) was then alkylated with chloro ketone (IV) to afford diketone (VIII). The Paal-Knorr cyclization of diketone (VIII) in the presence of ammonium acetate in boiling HOAc led to pyrrole (IX). Finally, reduction of the benzyloxycarbonyl group of (IX) by means of LiAlH4 furnished the target N-methyl piperidine.

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