Original articleA highly efficient In(OTf)3-catalyzed [3+3] annulation of spirocyclopropyl oxindoles with 1,4-di-THIANE (cas 1413-51-0)-2,5-diol

Add time:09/24/2019    Source:sciencedirect.com

Spirooxindoles play an important role in drug discovery and development. The development of efficient methods for the synthesis of spirooxindoles from easily available starting materials is of current interest. Herein, we report in detail the In(OTf)3-catalyzed [3 + 3] annulation of spirocyclopropyl oxindoles and 1,4-di-thiane-2,5-diol, which allows the facile preparation of spiro[indoline-3,4'-thiopyran]-2-ones bearing (tetrahydro)thiopyran skeleton.

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