Reaction of dianions of acetoacetic esters with epibromohydrin derivatives: a novel synthesis of tetrahydrofuran derivatives and tetrahydropyran derivatives
作者:Masahisa Nakada、Yukitaka Iwata、Masashi Takano
DOI:10.1016/s0040-4039(99)01913-9
日期:1999.12
The dianion of the acetoacetic ester reacts with epibromohydrin derivatives to afford a mixture of (Z)-2-alkoxycarbonylmethylidenetetrahydrofuran derivative and (E)-2-alkoxycarbonylmethylidenetetrahydropyran derivative. The selective formation of the tetrahydrofuran derivative is achieved by the use of LiClO4 as the additive.
Preparation of 3′-phosphonate analogs of 2′,3′-dideoxynucleosides
作者:Wai Y. Lau、Zhang Lihua、Wang Jianwu、Cheng Dongliang、Zhao Kang
DOI:10.1016/0040-4039(96)00829-5
日期:1996.6
γ-Hydroxyl vinylphosphonate (6) has been efficiently prepared by the base-catalyzed opening of the readily available epoxide (5) and converted to the corresponding nucleosides for antiviral studies.