Benzopyran derivativesR 0350 DOI: 10.1002/chin.201145133

An Efficient and Novel Synthesis of Chromonyl Chalcones Using Recyclable Zn(L-Proline)2 Catalyst in Water. — The cross-aldol condensation of 3-formyl-chromones with a series of acetyl-substituted heterocycles is investigated under opti-mized conditions. — (SIDDIQUI*, Z. N.; MUSTHAFA, T. N. M.; Tetrahedron Lett. 52 (2011) 31, 4008-4013, http://dx.doi.org/10.1016/j.tetlet.2011.05.118 ; Dep. Chem., Aligarh Muslim Univ., Aligarh 202 002, India; Eng.) — Mais

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