SYNTHESIS OF SOME DIETHYLPHOSPHONO SUBSTITUTED 2,5-DIHYDROFURAN, 2H-1-BENZOPYRANS AND 3H-NAPHTO[2,1-b]PYRAN

Abstract

The preparation of α,β unsaturated monophosphonate heterocycles is reported. 9-diethylphosphono-7-oxabicyclo[4.3.0]non-1(9)-ene, some 3-diethylphosphono-2H-1-benzopyrans and 2-diethylphosphono-3H-naphtol[2,1-b]pyran have been prepared from tetraethyl ethylidene gem-bisphosphonate and 2-hydrocydohexanone, substituted salicylaldehydes or 2-hydroxy-1-naphthaldehyde respectively.

Key Words:

• gem-bisphosphonate
• tetraethyl ethylidene gem-bisphosphonatez
• diethylphosphono 2,5-dihydrofuran
• diethylphosphono 2H-1-benzopyran
• diethylphosphono 3H-naphto[2,1-b]pyran
• synthesis of related compounds