Building the Housane: Diastereoselective Synthesis and Characterization of Bicyclo[2.1.0]pentane Carboxylic Acids
作者:Volodymyr V. Semeno、Vadym O. Vasylchenko、Bohdan V. Vashchenko、Dmytro O. Lutsenko、Rustam T. Iminov、Olesia B. Volovenko、Oleksandr O. Grygorenko
DOI:10.1021/acs.joc.9b03044
日期:2020.2.21
cyclopentane carboxylates bearing a leaving group (at the C-4 position) and an additional substituent (at the C-3 atom), in turn synthesized from cyclopent-3-ene carboxylate. The synthetic sequence allowed for the preparation of both cis- and trans-1,3-disubstituted housane-1-carboxylic acids in diastereoselective manner on up to 80 g scale. In particular, bicyclic γ-amino acids-γ-aminobutyric acid analogues-were
开发了一种1,3-二取代的双环[2.1.0]戊烷(hou烷)衍生物的方法。该方法依赖于双(三甲基甲硅烷基)酰胺锂介导的带有取代基的三取代的环戊烷羧酸酯的分子内环化,该羧基具有一个离去基团(在C-4位置)和一个附加的取代基(在C-3原子上),然后由环戊3合成-烯羧酸盐。该合成序列允许以非对映选择性的方式制备顺式和反式1,3-二取代的枯烷-1-羧酸,最多可制备80 g规模。特别地,合成了双环γ-氨基酸-γ-氨基丁酸类似物。结果表明,与环戊烷相比,双环[2.1.0]戊烷并没有显着影响相应衍生物的pKa,并且其亲水性略有提高(增加了0.07-0.25 Log P单位)。