作者:Pedro Laborda、Francisco J. Sayago、Carlos Cativiela、Vicente Gotor
DOI:10.2174/1570178614666171130161203
日期:2018.4.12
trans-Fused octahydroisoindole-1-carboxylic acids are bicyclic proline analogues of potential
interest in the search for new drugs. Within this work, the trans-fused octahydroisoindole system
has been constructed using methyl trans-2-(hydroxymethyl)cyclohexane-1-carboxylate as the key synthetic
precursor, in turn readily prepared from inexpensive cis-cyclohexane-1,2-dicarboxylic anhydride.
Both the (1S*,3aR*,7aR*)- and the (1R*,3aR*,7aR*)-octahydroisoindole-1-carboxylic acids
were prepared through the Strecker reaction of methyl trans-2-formylcyclohexane-1-carboxylate as the
key step. Finally, (1S*,3aR*,7aR*)-octahydroisoindole-1-carboxylic acid was obtained with good
yields in a highly stereoselective manner using (3aR*,7aR*)-octahydroisoindole-1-one as a suitable
scaffold.
反式-融合八氢异吲哚-1-羧酸是一种双环脯氨酸类似物,在寻找新药方面具有潜在的意义。在这项工作中,我们使用反式-2-(羟甲基)环己烷-1-羧酸甲酯作为关键合成前体,构建了反式融合八氢异吲哚体系,而反式-2-(羟甲基)环己烷-1-羧酸甲酯又很容易从廉价的顺式-环己烷-1,2-二羧酸酐中制备出来。
(1S*,3aR*,7aR*)-和(1R*,3aR*,7aR*)-八氢异吲哚-1-羧酸都是通过反式-2-甲酰基环己烷-1-羧酸甲酯的 Strecker 反应作为关键步骤制备的。最后,以(3aR*,7aR*)-八氢异吲哚-1-酮为合适的支架,以高度立体选择性的方式获得了(1S*,3aR*,7aR*)-八氢异吲哚-1-羧酸。