Base mediated green synthesis of enantiopure 2-C-spiro-glycosyl-3-nitrochromenes
Sabita Nayak1, Pravati Panda, Bishnu Prasad Raiguru
1Department of Chemistry, Ravenshaw University, Cuttack, Odisha, India. sabitanayak18@gmail.com.
Abstract:
A novel green synthetic methodology has been developed to obtain enantiopure (2S)-2-C-spiro-glycosyl-3-nitrochromenes following the oxa-Michael-aldol condensation reaction of sugar derived 3-C-vinyl nitro olefins with substituted salicylaldehydes using Et3N as a base under neat conditions at rt-40 °C. The stereochemistry of the product is confirmed by a single crystal X-ray study. Several advantages are associated with this protocol such as cost effectiveness, easy accessibility, short reaction time, high yields, wide substrate scope and high enantiopurity.
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