作者:Douglass F. Taber、Jonathan L. Schuchardt
DOI:10.1016/s0040-4020(01)87746-2
日期:1987.1
spiroannulation of 4,4-dimethyl cyclohexanone with -(2-iodoethyl)ether, followed by diazo transfer and Wolff rearrangement, gives acid 6. Homologation to the corresponding β-ketoester, followed by diazo transfer and Rh-mediated intramolecular C-H insertion, then gives ester 8. Reduction of 8 followed by dehydration leads to the α,β unsaturated ester, which on exposure to CrO3 in acetic acid is oxidized
建立了倍半萜类抗生素戊烯戊内酯3的简单途径。因此,将4,4-二甲基环己酮与-(2-碘乙基)醚螺环化,然后进行重氮转移和Wolff重排,得到酸6。同源化为相应的β-酮酸酯,然后进行重氮转移和Rh介导的分子内CH插入,然后得到酯8。还原8,然后脱水,得到α,β不饱和酯,该酯在乙酸中接触CrO 3时,在受阻较小的亚甲基中优先被氧化。然后,α-亚甲基化完成1的合成。