Synthesis of new molecular scaffolds: 3-aza-7,9-dioxa-bicyclo[4.2.1]nonane (8-exo BTKa) and 3-aza-8,10-dioxa-bicyclo[5.2.1]decane (9-exo BTKa) carboxylic acids
作者:Dina Scarpi、Daniela Stranges、Luca Cecchi、Antonio Guarna
DOI:10.1016/j.tet.2004.01.039
日期:2004.3
Two classes of enantiopure molecular scaffolds were prepared, whose lactam structure formally derives from the coupling between tartaric acid and β- or γ-ketoamines. We labelled these compounds as 8-exo and 9-exo BTKa, indicating the lactam size (8- and 9-membered ring, respectively). Starting from β- and γ-nitroketones, the synthesis involves the ketal formation by (R,R)-dimethyl tartrate. The subsequent
制备了两类对映体纯的分子支架,其内酰胺结构形式上源自酒石酸与β-或γ-酮胺之间的偶联。我们将这些化合物标记为8- exo和9- exo BTKa,表明内酰胺的大小(分别为8和9元环)。从β-和γ-硝基酮开始,合成涉及由(R,R)-酒石酸二甲酯形成缩酮。随后的酰胺键形成发生在阮内镍上的硝基氢化期间,未观察到预期的开链胺。