Sequential deprotection–cyclisation reaction: stereoselective synthesis of azabicyclic β-enamino ester derivatives and (−) indolizidine 209D
作者:Thanasekaran Ponpandian、Shanmugam Muthusubramanian
DOI:10.1016/j.tet.2012.11.029
日期:2013.1
This paper describes a new strategy for the stereoselective synthesis of pyrrolizidine and indolizidine based enamino esters and their acyl derivatives from l-proline. The key reaction in this process involves deprotection followed by ring closure of cyclic N-Boc amino-β-ketoesters. Also, the synthesis of 5R,9R-(−)-indolizidine 209D has been accomplished using this protocol.
本文描述了一种新的策略,用于从1-脯氨酸立体选择性地合成吡咯烷和吲哚并立定的烯胺酯及其酰基衍生物。该过程中的关键反应包括脱保护,然后关闭环状N -Boc氨基-β-酮酸酯的环。同样,已经使用该方案完成了5 R,9 R -(-)-吲哚并立定209D的合成。