Synthesis of diversely substituted bis-pyrrolizidino/ thiopyrrolizidino oxindolo/acenaphthyleno curcuminoids via sequential azomethine ylide cycloaddition†
Meenakshi Singh,Abhijit Hazra,Yogesh P. Bharitkar,Ritu Kalia,Ashutosh Sahoo,Sneha Saha,V. Ravichandiran,Shekhar Ghosh,Nirup B. Mondal
RSC Advances Pub Date : 05/23/2018 00:00:00 , DOI:10.1039/C8RA02725K
Abstract

Curcumin has been transformed to several diversely substituted bis-pyrrolizidino/thiopyrrolizidino oxindolo/acenaphthyleno curcuminoids via a sequential azomethine ylide cycloaddition reaction using isatins/acenaphthoquinone and proline/thioproline as the reagents. The products were separated via extensive chromatography and characterized by 1D/2D NMR and HRMS analysis.

Graphical abstract: Synthesis of diversely substituted bis-pyrrolizidino/ thiopyrrolizidino oxindolo/acenaphthyleno curcuminoids via sequential azomethine ylide cycloaddition