作者:Daniel C. Elliott、John A. Beutler、Kathlyn A. Parker
DOI:10.1021/acsmedchemlett.7b00161
日期:2017.7.13
intermediates for analogue synthesis: the 4-desmethyl Δ5,6 tricycle and the 4-oxo Δ5,6 tricycle. The former was elaborated to 4-desmethyl englerin A and the latter served as a common precursor for englerin A, 4-ethyl englerin A, and 4-isopropyl englerin A. 4-Desmethyl englerin A was less active than the natural product by an order of magnitude, but the 4-ethyl and 4-isopropyl analogues were comparable
恩格尔林核的闭环易位/环戊醚化方法适于为类似物合成提供两个关键中间体:4-去甲基Δ5,6三环和4-氧代Δ5,6三环。前者被精加工成4-desmethyl englerin A,而后者则是englerin A,4-ethyl englerin A和4-isopropyl englerin A的共同前体。按顺序,4-Desmethyl englerin A的活性比天然产物低但是,4-乙基和4-异丙基类似物在活性上与恩戈林A相当。这些结果与4-烷基增强肉桂酰基酯取代基的结合构象的前提是一致的。此外,他们认为4-烷基恩格尔林结构可能被证明是有用的工具化合物。