A highly efficient and stereoselective cycloaddition of nitrones to N-arylitaconimides
作者:Polina S. Teterina、Mariia M. Efremova、Ekaterina V. Sirotkina、Alexander S. Novikov、Olesya V. Khoroshilova、Alexander P. Molchanov
DOI:10.1016/j.tetlet.2019.151063
日期:2019.9
The 1,3-dipolar cycloaddition of keto- and aldonitrones with N-arylitaconimides proceeds regioselectively giving only 5-spiroisoxazolidines. In the case of aldonitrones the reaction proceeds with high diastereoselectivity. A range of the obtained adducts were subjected to reductive cleavage of the NO bond using zinc powder in acetic acid to give the corresponding spirolactones and 1,3-amino alcohols
酮基和醛基酮与N-芳基衣康酰亚胺的1,3-偶极环加成反应可选择性地进行,仅产生5-spiroisoxazolidines。在醛基亚硝基的情况下,反应以高非对映选择性进行。使用锌粉在乙酸中,将所得的一系列加合物进行N O键的还原性裂解,得到相应的螺内酯和1,3-氨基醇。