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■ Recyclable Heterogeneous Nanocrystal Promoted Cascade Reaction in Water: An Access to Green Synthesis of Highly Functionalized 4H-Pyrans Containing Phosphonate Motif

Yong-Hong Cai, Ya-Sa Xie, Ran Li, Ming-Mei Fan, Jing-Jing Li, Chuan-Bao Zhang,* and Jin-Fang Yuan*

*College of Chemistry and Chemical Engineering, Henan University, Kaifeng, 475004, China.

Abstract

A green and environmentally friendly cascade reaction of diethyl (2-phenylacetyl)phosphonate with benzylidenemalononitrile promoted by Zr-Ce-SBA-15-NH2 in water was developed, and a wide range of highly functionalized 4H-pyrans containing phosphonate motif were obtained in up to 89% yield. Moreover, SBA-15-NH2 also showed good catalytic activity for this transformation in acetonitrile.