An Efficient Synthesis of 3,4-Dihydro-2,2-Dimethyl-2h-Pyrano Coumarin Derivatives

P. E. Kumar and K. J. Rajendraprasad*

Department of Chemistry, Bharathiar University, Coimbatore - 641 046 India.

ABSTRACT:

5-Hydroxy-7-methoxy-2,2-dimethyl chroman (1) on condensation with ethyl acetoacetate in the presence of anhydrous aluminium chloride and phosphorous oxychloride gave 5-methoxy-9,10-dihydro-4,8,8-trimethyl pyrano(2,3-h) pyranocoumarin (2) In quantitative yield. The same reaction of hydroxychroman8,3 and 5 afforded the pyranocoumarins4 and 3 respectively. All these products were characterised by spectral means.

KEYWORDS:

acetoacetate; hydroxychroman8; respectively

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Copy the following to cite this article: Kumar P. E, Rajendraprasad K. J. An Efficient Synthesis of 3,4-Dihydro-2,2-Dimethyl-2h-Pyrano Coumarin Derivatives. Orient J Chem 1998;14(3).

Copy the following to cite this URL: Kumar P. E, Rajendraprasad K. J. An Efficient Synthesis of 3,4-Dihydro-2,2-Dimethyl-2h-Pyrano Coumarin Derivatives. Orient J Chem 1998;14(3). Available from:http://www.orientjchem.org/?p=37249