K. Mizuno et al., REGIOSELECTIVE C-FUNCTIONALIZATION OF 2,3-DICYANOPYRAZINE DERIVATIVESVIA PHOTOINDUCED ELECTRON-TRANSFER, Chemistry Letters, (12), 1995, pp. 1077-1078
Irradiation of an acetonitrile solution containing 2,3-dicyano-5,6-dip
henylpyrazine with allylic silanes, benzylsilane, and ketene silyl ace
tal gave the mono-substituted products in excellent yields. This react
ion is useful for the functionalization of pyrazine ring.