Total Synthesis of an <i>Isatis indigotica</i>-Derived Alkaloid Using a Biomimetic Thio-Diels–Alder Reaction
作者:Emma K. Davison、Paul A. Hume、Jonathan Sperry
DOI:10.1021/acs.orglett.8b01321
日期:2018.6.15
A biomimetic thio-Diels–Alder reaction between a dienylthiadiazole and 3-thioisatin leads to the Isatis indigotica-derived alkaloid (1), along with its diastereomer 2. This synthetic study, supported by molecular modeling, establishes the viability of the proposed biosynthesis by thio-Diels–Alder cycloaddition, a very rare reaction in nature. Moreover, the results described infer that the diastereomer
一个dienylthiadiazole和3- thioisatin引线之间仿生硫代Diels-Alder反应的菘蓝衍生的生物碱(1)中,用非对映体及其沿2。这项合成研究得到分子模型的支持,建立了拟议中的硫代-狄尔斯-阿尔德环加成生物合成的可行性,这是自然界中非常罕见的反应。此外,所描述的结果推断非对映异构体2是在板蓝根中存在的尚未发现的天然产物。