中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | (1S,4aS)-6-Methoxy-1,4a,7-trimethyl-1,2,3,4,4a,9,10,10a-octahydro-phenanthrene-1-carboxylic acid methyl ester | 18125-85-4 | C20H28O3 | 316.441 |
—— | 12,19-dimethoxypodocarpa-8,11,13-triene | 74763-95-4 | C19H28O2 | 288.43 |
—— | Methyl 13-formyl-12-methoxypodocarpa-8,11,13-trien-19-oate | 18125-65-0 | C20H26O4 | 330.424 |
—— | LY-180299 | 901-36-0 | C19H24O4 | 316.397 |
—— | 12-methoxypodocarpa-8,11,13-trien-19-ol | 1224-26-6 | C18H26O2 | 274.403 |
Methods for the oxidation of the aryl ring of derivatives of podocarpic acid have been examined. Oxidation of methyl 12-hydroxypodocarpa-8,11,13-trien-19-oate (2) with phenyliodonium diacetate in various solvents gives 8β-substituted dienones. An 8β-chloro dienone is formed during oxidation of the phenol (2) with t-butyl hypochlorite. Oxidation of (2) with dimethyldioxiran gives mainly the 7-ketone (13) but also affords the novel ε-lactone (26), while treatment with ruthenium tetraoxide also affords products of benzylic oxidation. Oxidation of methyl podocarpa-8,11,13-trien-19-oate (4) with m-chloroperbenzoic acid affords a B-ring lactone (29) and, unexpectedly, a 6α-chloro 7-ketone (30). The action of cerium(IV) ammonium nitrate on (2) gives nitro derivatives rather than oxidation products. Oxidation of methyl 12-hydroxy-13-methoxypodocarpa-8,11,13-trien-19-oate (22) with m-chloroperbenzoic acid gives a low yield of a 7-oxo derivative (17) while treatment with ozone gives an unusual α,β-unsaturated γ-lactone (31), the hydroxy lactone (33), the unsaturated keto ester (34), and the substituted furan (35). Oxidation of (22) with Fremy"s salt gives products of ring B oxidation. The structure of (31) has been confirmed by X-ray crystallography.