Sodium borohydride reduction of 5,8-dimethyl-3,4-dihydronaphthalen-1-(2H)-one (4) yielded 5,8-dimethyl-1,2,3,4-tetrahydro-1-naphthol (5). The tetralol 5 on Vilsmeier-Haack reaction with N,N-dimethylacetamide yielded 1-(5,8-dimethyl-3,4-dihydro-2-naphthyl)ethan-1-one (7) which on hydrogenation over Pd/C afforded 1-(5,8-dimethyl-1,2,3,4-tetrahydro-2-naphthyl)ethan-1-one (8). The tetralol 5 on Vilsmeier-Haack formylation gave 5,8-dimethyl-3,4-dihydro-2-naphthaldehyde (9) which on reduction with lithium aluminium hydride followed by oxidation with the Jones reagent furnished 5,8-dimethyl-1,2,3,4-tetrahydro-2-naphthoic acid (11). The acid 11 on treatment with excess of methyllithium yielded (±)-occidol (1); with two moles of methyllithium it yielded ketone 8, which on reaction with methyllithium furnished (±)-occidol (1).
钠硼氢化钠还原5,8-二甲基-3,4-二氢萘酮-1-(2H)-酮(4)得到5,8-二甲基-1,2,3,4-四氢萘酚(5)。四氢酚5在Vilsmeier-Haack反应中与N,N-二甲基乙酰胺反应,得到1-(5,8-二甲基-3,4-二氢-2-萘基)乙酮(7),在Pd/C上氢化后得到1-(5,8-二甲基-1,2,3,4-四氢-2-萘基)乙酮(8)。四氢酚5在Vilsmeier-Haack甲酰化反应中得到5,8-二甲基-3,4-二氢-2-萘醛(9),经过锂铝氢化还原后再经Jones试剂氧化得到5,8-二甲基-1,2,3,4-四氢-2-萘甲酸(11)。酸11与过量的甲基锂反应生成(±)-occidol(1);与两摩尔的甲基锂反应生成酮8,再与甲基锂反应生成(±)-occidol(1)。