Sodium hydride → trans-3,4-dihydro-3-hydroxy-2,2-dimethyl-4-(3-oxo-1-cyclopent-1-enylamino)-2H-1-benzopyran-6-carbonitrile

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Reaction Steps

2.41 g of the epoxide of example 1 were solved in 36 ml of dimethylsulfoxide under a protective gas, and 360 mg of sodium hydrid were added. To this stirred suspension was added 1.71 g of 3-amino-cyclopent-2-en-1-one (Chem. Ber. 103, 2403 [1970]) in portions. After 21 hours, the reaction solution was worked up in an aqueous manner and extracted with ethyl acetate. The usual further processing and recrystallisation of the product obtained from ethyl acetate yielded white crystals having a m.p. of 174°-176° C.

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