Preparation of 1,4-Benzothiazines Using Stable Phosphorus Ylides

Abstract

Heating of stable phosphorus ylides in boiling dioxane as a solvent results in ring closure with extrusion alcohol and triphenyphosphine and to give alkyl-2-(3-oxo-3,4-dihydro-2H-1,4-benzothiazin-2-yliden)acetates in good to excellent yields.

Keywords:

• 1,4-Benzothiazines
• stable phosphorus ylides
• triphenylphosphine

We thank the Shahid Bahonar University for financial support as a Grant-in-Aid for Scientific Research.