作者:Mangaleswaran Sivaprakasam、François Couty、Olivier David、Jérôme Marrot、Regati Sridhar、Boga Srinivas、Kakulapati Rama Rao
DOI:10.1002/ejoc.200700616
日期:2007.12
epoxides and L-proline. The key step of this synthesis relied on a diastereoselective intramolecular alkylation of a proline enolate, which led to an azetidine ring fused to a five-membered ring. These strained bicyclic nitrogen derivatives were found to be good precursors for the preparation of azepanes, after transformation into the corresponding ammonium trifluoromethanesulfonates followed by reaction
对映体纯的 1-氮杂双环 [3.2.0] 庚烷衍生物以简单的方式从容易获得的手性来源合成,即对映体纯的环氧化物和 L-脯氨酸。该合成的关键步骤依赖于脯氨酸烯醇化物的非对映选择性分子内烷基化,这导致氮杂环丁烷环与五元环稠合。在转化为相应的三氟甲磺酸铵,然后与亲核试剂反应后,发现这些张力双环氮衍生物是制备氮杂环庚烷的良好前体。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)