Direct Synthesis of 6-Azabicyclo[3.2.1]oct-6-en-2-ones and Pyrrolizidines from Divinyl Ketones and Observation of Remarkable Substituent Effects
作者:Xianxiu Xu、Yifei Li、Yu Zhang、Lingjuan Zhang、Ling Pan、Qun Liu
DOI:10.1002/adsc.201000880
日期:2011.5
Substituents create access to molecular diversity. Under basic conditions, 6‐azabicyclo[3.2.1]oct‐6‐en‐2‐ones 3 and pyrrolizidines 4 are efficiently synthesized, respectively, in a single step from ethyl isocyanoacetate 2 and divinyl ketones 1 bearing an aryl or alkyl group at the 2‐position. For comparison, only the corresponding pyrrolizidines 4′ can be obtained from divinyl ketones 1′ bearing a
取代基创造了获得分子多样性的途径。在碱性条件下,一步反应可分别由异氰基乙酸乙酯2和带有芳基或烷基的二乙烯基酮1分别高效合成6-氮杂双环[3.2.1] oct-6-en-2-酮3和吡咯烷核苷4。 2位。为了比较,仅可以从在2-位带有甲氧基羰基的二乙烯基酮1 '获得相应的吡咯烷核苷4 ' 。