作者:Haishan Wang、A. Ganesan
DOI:10.1021/jo000306o
日期:2000.7.1
rearrangement of the indole to form a spirooxindole. Synthetically, formation of the oxindole ring was stereoselectively accomplished by reaction of the appropriate indole precursor with N-bromosuccinimide. For optimum results, the oxidation should be carried out prior to diketopiperazine cyclization. In this manner, we have synthesized the tetrahydro- and dihydro- analogues of spirotryprostatin B in four steps
得自Trp-Pro二酮哌嗪的异戊烯化的天然产物螺旋菌前列腺素A和B也具有吲哚的氧化重排以形成螺环吲哚的特征。合成地,通过适当的吲哚前体与N-溴代琥珀酰亚胺的反应立体选择性地完成羟吲哚环的形成。为了获得最佳结果,应在二酮哌嗪环化之前进行氧化。通过这种方式,我们从L-色氨酸甲酯的四个步骤中合成了螺旋菌前列腺素B的四氢和二氢类似物。然后,通过使吡咯烷环不饱和成吡咯啉,将二氢衍生物转化为螺菌素前列腺素B,从而明确确认了天然产物的结构。