readily obtainable in large quantities from (+)-nopinone, (4aR,6RS, 8aR)-6-methoxy-5-methylene-8a-vinyl-7-oxaoctahydronaphthalen-2(1H)-one, a promising key intermediate for the asymmetric synthesis of C14-oxygenated elemanolides, (+)-vernolepin and (–)-vernomenin, are prepared in 14 steps and ca. 25% overall yield.
                                    以(1 R,5 S)-4,6,6-三甲基-3-(苯
硫基)双环[3.1.1]庚-3-烯-2-酮为原料,可以很容易地从(+)-壬酮大量获得,(4a R,6 RS,8a R)-6-甲氧基-5-亚甲基-8a-
乙烯基-7-氧八氢
萘-2(1 H)-一,是不对称合成C 14-氧化的香滑
酚的有前途的关键中间体(+)-vernolepin和(–)-vernomenin是分14步制备的。总产率为25%。