An efficient one-pot synthesis of functionalized 2-amino-4H-pyrans by a meglumine-catalyzed three-component reaction has been developed. A broad range of substrates including aromatic and heteroaromatic aldehydes, isatin derivatives, and acenaphthenequinone are condensed with enolizable C-H activated compounds and alkylmalonates to give the desired products in high to excellent yields. This methodology provides an alternative approach for rapid access to construct a diversity-oriented library of 4H-pyrans.
Efficient synthesis of benzo[g]-and benzo[h]chromene derivatives by one-pot three-component condensation of aromatic aldehydes with active methylene compounds and naphthols
作者:B. Sunil Kumar、N. Srinivasulu、R. H. Udupi、B. Rajitha、Y. Thirupathi Reddy、P. Narsimha Reddy、P. S. Kumar
DOI:10.1134/s1070428006120098
日期:2006.12
A convenient procedure is reported for the synthesis of benzo[g]- and benzo[h]chromene derivatives via one-pot three-component condensation of aromatic aldehydes with malononitrile or ethyl cyanoacetate and 1- or 2-naphthol in the presence of 10 mol % of titanium tetrachloride as catalyst. The reactions require no solvent; they are characterized by simple experimental procedure and easy isolation and can be performed on enlarged scale.
Kumar, Sunil; Khalid, Saifuddin; Udupi, Asian Journal of Chemistry, 2010, vol. 22, # 4, p. 2685 - 2688