新产品编号:1652117

Chemical Name: 20(S)-Methoxy-7beta-methyl-4-aza-5alpha-pregn-1-en-3-one
项目整合开发状态: Preclinical
项目研究机构: Merck & Co. (Originator)
合成路线:Pregnenolone acetate (I) was reduced with NaBH4 to give alcohol (II),which was subsequently protected as the silyl ether (III) by means of tert-butyl dimethylsilyl chloride and imidazole.Allylic oxidation of (III) with tert-butyl hydroperoxide and chromium hexacarbonyl produced the unsaturated ketone (IV).Addition of methylmagnesium chloride to (IV),with concomitant cleavage of the acetate ester,yielded diol (V),and further Oppenauer oxidation using cyclohexanone and aluminum triisopropoxide generated dienone (VI).Selective reduction of one double bond of (VI) to give enone (VII) was achieved by transfer hydrogenation with cyclohexene and Pd/C.Oxidative cleavage of the A ring of (VII) with NaIO4 and KMnO4 to give (VIII),followed by HF-promoted desilylation furnished the 7beta-methylpregnane seco-acid (IX).This was cyclized with 2,4-dimethoxybenzyl amine (X) affording the azasteroid (XI).

合成路线:After hydrogenation of the enamine double bond of (XI) to give (XII),alkylation of the hydroxyl group of (XII) in the presence of KH provided the methyl ether (XIII).The dimethoxybenzyl protecting group of (XIII) was then cleaved with trifluoroacetic acid to give (XIV).This was finally dehydrogenated to the title compound employing DDQ or (PhSeO)2O as the oxidant reagents.