| 中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
|---|---|---|---|---|
| —— | 12,12-ethylenedioxypodocarp-8-en-19-yl acetate | 79386-14-4 | C21H32O4 | 348.483 |
| —— | Acetic acid (1S,4aR,4bS,8aR)-8a-hydroxy-1,4b-dimethyl-6-oxo-1,2,3,4,4a,4b,5,6,7,8,8a,9-dodecahydro-phenanthren-1-ylmethyl ester | 79386-23-5 | C19H28O4 | 320.429 |
| —— | Acetic acid (1S,4bS,8aS)-8a-hydroxy-1,4b-dimethyl-6-oxo-1,2,3,4,4b,5,6,7,8,8a,9,10-dodecahydro-phenanthren-1-ylmethyl ester | 79386-24-6 | C19H28O4 | 320.429 |
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.