α-Keto amides bearing (S)-indoline chiral
auxiliaries reacted with lithiated methoxyallene or lithium acetylides to
produce the corresponding dihydrofuranones 7 through formation of the
tertiary α-hydroxy allenes, or tertiary α-hydroxy acetylenes,
respectively, at â78 °C with high diastereoselectivities (up to
>99% de).
带有(S)-
吲哚啉手性基团的β-酮酰胺类辅助试剂与
锂化甲氧基烯炔或
乙炔锂反应,通过在â78°C下分别形成叔-γ-羟基烯
丙炔或叔-γ-羟基
乙炔,以高立体选择性(高达99%以上)来生产相应的二氢
呋喃酮7。