中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
[(2E)-3,7-二甲基辛-2,7-二烯基]丙酸酯 | 3,7-dimethyl-2(E),7-octadienyl-1-propionate | 75705-48-5 | C13H22O2 | 210.316 |
—— | (Z)-3,7-dimethyl-2,7-octadien-1-yl propanoate | 73214-62-7 | C13H22O2 | 210.316 |
—— | (2Z)-3,7-dimethyl-2,7-octadien-1-ol | 14459-15-5 | C10H18O | 154.252 |
—— | (E)-3,7-dimethyl-2,7-octadien-1-ol | —— | C10H18O | 154.252 |
The three isomeric components of the San Jose scale pheromone, 5–7, have been synthesized from a common β-keto ester intermediate. A study of the alkylation of the dianion of methyl acetoacetate with a series of alkylating agents with the same carbon skeleton has been carried out. The trisubstituted alkenes in 5 and 6 have been synthesized stereospecifically via a copper-catalyzed coupling of a methyl Grignard reagent with the E or Z enol phosphate from the alkylated β-keto ester. In the case of the Z enol derivative, the coupling reaction was carried out on the diethyl- and diphenylphosphates, and the enol triflate. The diethyl enol phosphate gave the highest stereoselectivity. The synthetic pheromones were attractive to San Jose scale in the field.[Formula: see text]