Tributylstannane → Benzopyran

Beteiligte Stoffe

Reaktionsschritte

In 3 ml of anhydrous toluene, is dissolved 73 mg of 6-cyano-2,2-dimethyl-4-{1,2-dihydro-2-oxo-4-(1-phenoxythiocarbonyloxy-2-ethoxycarbonylethyl)-1-pyridinyl}-2H-benzo[b]pyran obtained in Example 32. Then, 45 mg of 2,2'-azobisisobutyronitrile and 80 mg of tri-n-butyltin hydride are added to the solution at room temperature, and the resulting mixture is reacted at 100° C. for 30 minutes. After the reaction, the reaction mixture is directly purified by silica gel column chromatography to obtain 42 mg of 6-cyano-2,2-dimethyl-4-}-1,2-dihydro-2-oxo-4-(2-ethoxycarbonylethyl)-1pyridinyl}-2H-benzo[b]pyran.

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