The synthesis of (2S,12′R)-2-(12′-aminotridecyl)pyrrolidine [(S,R)-8], a defense alkaloid of the Mexican bean beetle Epilachna varivestis starting from (R)-proline is described. The second stereogenic center is generated by nucleophilic 1,2-addition of methyllithium to an aldehyde-SAMP-hydrazone, followed by reductive N-N bond cleavage. The product is obtained in good yield and high enantiomeric and diastereomeric purity.
本文描述了从(R)-脯
氨酸开始合成墨西哥豆甲虫 Epilachna varivestis 的防御
生物碱 (2S,12′R)-2-(12′-aminotridecyl)pyrrolidine [(S,R)-8] 的过程。第二个立体中心是通过
甲基锂与醛-
SAMP-腙的亲核 1,2-加成,然后进行还原性 N-N 键裂解生成的。该产品收率高,对映异构体和非对映异构体纯度高。