Reduction of quinoxalines and pteridines with sodium borohydride or sodium cyanoborohydride in the presence of benzyl chloroformate gives N-benzyloxycarbonyl- or N,N′-bisbenzyloxycarbonyl tetrahydro derivatives.
J. R. Russell, C. D. Garner and J. A. Joule, J. Chem. Soc., Perkin Trans. 1, 1992, 1245 DOI: 10.1039/P19920001245
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