| 中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
|---|---|---|---|---|
| —— | 4β-Methoxycarbonyl-4α,10β-dimethyl-1,2,3,4,5α,6,7,8β,10,12,13,14-dodecahydro-phenanthron-(12) | 24402-17-3 | C18H26O3 | 290.403 |
| —— | (1S,4aR,4bS,8aR,10aR)-8-Isopropyl-1,4a-dimethyl-6-oxo-1,2,3,4,4a,4b,5,6,8a,9,10,10a-dodecahydro-phenanthrene-1-carboxylic acid methyl ester | 73616-45-2 | C21H32O3 | 332.483 |
| —— | Methyl-12-oxopodocarp-13-en-19-oat | 24402-16-2 | C18H26O3 | 290.403 |
| —— | 12,12-ethylenedioxypodocarp-8-en-19-oic acid | 50866-12-1 | C19H28O4 | 320.429 |
| —— | (4aR,4bR,8S,8aR)-1-Isopropyl-4b,8-dimethyl-3-oxo-4,4a,4b,5,6,7,8,8a,9,10-decahydro-3H-2-oxa-phenanthrene-8-carboxylic acid methyl ester | 73616-48-5 | C20H30O4 | 334.456 |
Attempts to alkylate products from Birch reductions of derivatives of podocarpic acid are reported. Attempted reductive silylation of ring C of methyl 12-methoxypodocarpa-8,11,13-trien-19-oate (5) gives products of C4 ester reduction only. The enantiopure form of the bis(ethylene acetal) (15) of 19-norpodocarp-8-ene-3,12-dione, a potentially useful intermediate for quassinoid synthesis, has been prepared from the ketone (34). Functionality at C8 on the β-face has been successfully introduced by abnormal Reimer–Tiemann reactions of podocarpic acid (2) and its 13-methyl derivative (10). The saturated ketone (48) has been converted into an α,β-unsaturated ketone (18) which has potential for introducing functionality at C14.