Citation: Se. Watson et A. Markovich, SYNTHESIS OF PROTECTED 5-FORMYLPYRIDO[2,3-D]PYRIMIDINE VIA A 2,3,4-TRISUBSTITUTED PYRIDINE USING AN ORTHO-LITHIATION STRATEGY - APPLICATIONTO THE SYNTHESIS OF A FOLATE DERIVATIVE, Heterocycles, 48(10), 1998, pp. 2149-2155