Concise synthesis of vinylheterocycles through beta-elimination under solventless phase transfer catalysis conditions

Various vinylheterocycles compounds have been prepared in excellent yields through betaelimination of the corresponding sulfonate esters with 50% aq NaOH under phase transfer catalysis conditions without organic solvent. The new approach provides an economic and environmentally friendly solution to removal of hazardous bases as well as toxic and expensive dipolar aprotic solvents.