Sulfated tungstate: A green catalyst for synthesis of thiomorpholides via Willgerodt–Kindler reaction

Use of sulfated tungstate as an efficient, green and reusable catalyst for preparation of thiomorpholides via Willgerodt–Kindler reaction pathway is presented. The reaction proceeds under solvent free condition. The advantages of this method are high yields, short reaction times, ease of product isolation and recyclability of catalyst for a number of times without significant loss of activity.

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► Sulfated tungstate is a new solid, mildly acidic, stable and eco-friendly catalyst.
► Efficient for synthesis of thiomorpholides via Willgerodt–Kindler reaction.
► Reactions are solvent free and with easy work up procedure.
► The catalyst can be easily recovered and recycled several times.