The first stereoselective syntheses of the naturally occurring, α,β-unsaturated lactone hyptolide 1 and of its nonnatural epimer at C-6 are described. Ethyl l-lactate was the chiral starting material. Key steps of these syntheses were a Brown's asymmetric allylation, a Carreira's asymmetric ethynylation and a ring closing metathesis.
描述了天然存在的α,β-不饱和内酯hyptolide 1及其在C-6处的非天然差向异构体的第一立体选择性合成。L-
乳酸乙酯是手性起始原料。这些合成的关键步骤是布朗的不对称烯丙基化,卡雷拉的不对称
乙炔化和闭环复分解。