Synthesis of dl-dehydroiridodiol.
作者:HITOSHI KIMURA、SHIGEMI MIYAMOTO、HISASHI SHINKAI、TETSUZO KATO
DOI:10.1248/cpb.30.723
日期:——
Diethyl 3, 6-dioxooctanedioate (5), which can be prepared readily from ethyl acetoacetate and ethyl γ-bromoacetoacetate, was utilized for a facile preparation of dl-dehydroiridodiol (1). Compound 5 was treated with sodium hydroxide to give ethyl 2-ethoxycarbonyl-3-oxo-1-cyclopenteneacetate (6), which was methylated, and then reduced to give ethyl 2-(2-ethoxycarbonyl-3-oxocyclopentyl) propionate (8). Compound 8 was transformed to the phosphate (9). On methylation with lithium dimethylcuprate, followed by reduction, the phosphate (9) was converted to dl-dehydroiridodiol (1) via ethyl 2-(2-ethoxycarbonyl-3-methyl-2-cyclopentenyl) propionate (10).
3, 6-二氧代辛二酸二乙酯 (5) 可以很容易地由乙酰乙酸乙酯和 γ-溴乙酰乙酸乙酯制备,可用于轻松制备 dl-脱氢铱二醇 (1)。化合物5用氢氧化钠处理,得到2-乙氧基羰基-3-氧代-1-环戊烯乙酸乙酯(6),将其甲基化,然后还原,得到2-(2-乙氧基羰基-3-氧代环戊基)丙酸乙酯(8) 。化合物8转化为磷酸酯(9)。用二甲基铜酸锂甲基化,随后还原,磷酸酯(9)通过2-(2-乙氧基羰基-3-甲基-2-环戊烯基)丙酸乙酯(10)转化为dl-脱氢铱二醇(1)。