作者:Wesam Qayed、Frederick Luzzio
DOI:10.2174/1570178612666150819194241
日期:2015.10.6
Enantiospecific and enantioselective approaches to the natural (16R,19R)- and the unnatural
(16S,19S)- THF core of the bioactive acetogenin annonacin are described which utilizes both a chiral
pool synthesis and enzymatic transformations. In the antipodal (2S,5S) THF series derived from D-
(+)-glucosamine, the semi-protected THF aldehyde synthon allows for two-directional synthetic
elaboration through a Henry reaction with a lipid-like nitroalkane. The resulting nitroalcohol having
the unnatural (2S,5S)-THF core was oxidized to the corresponding -nitroketone using a modified
Collins oxidation. The intermediate -nitroketone has potential for the preparation of the C15-C32 core and analogues
through subsequent removal of the nitro group and reduction of the carbonyl.
描述了针对生物活性乙酰合成素annonacin的天然(16R,19R)和非天然(16S,19S)四氢呋喃(THF)核心的消旋体特异性及消旋体选择性方法,这些方法结合了手性池合成和酶转化变换。在从D-(+)-葡萄糖胺衍生的对映体(2S,5S)THF系列中,半保护的THF醛前体通过与类脂质硝基烷的Henry反应,实现了双向合成的精细加工。所得的具有非天然(2S,5S)-THF核心的硝基醇通过改良的Collins氧化被氧化为相应的硝基酮。该硝基酮中间体在随后去除硝基并还原羰基后,可能用于制备C15-C32核心及其类似物。