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An efficient synthesis of 1,1,3-trisubstituted-1H-isochromenes,  3  is reported from isochromen-1-ones,  1  and Grignard Reagents,  2a-h  through sequential Grignard reactions/acid-catalyzed cyclization. The cyclization underwent smoothly with montmorillonite K10 catalyst to obtain the 1,1,3-trisubstituted-1H-isochromenes in excellent yields.

Montmorillonite Catalyzed Tandem Synthesis of 1,1,3-Trisubstituted-1H-Isochromenes from 3-Phenylisochromenones