254753-79-2Relevant articles and documents
Ring closure reactions of pyrido[2,3-d]pyrimidines to pyrano[2′, 3′:4,5]- and oxazolo[5′,4′:4,5]pyrido[2,3-d]pyrimidines
Tinh, Dang Van,Stadlbauer, Wolfgang
experimental part, p. 1359 - 1364 (2009/04/07)
(Chemical Equation Presented) The cyclocondensation of 5-hydroxy-pyrido[2, 3-d]pyrimidines 1 with malonates gives pyrano[2′,3′:4,5]-pyrido[2,3- d]pyrimidines 2. Nitration of 1 and reduction with zinc in the presence of carboxylic acids/anhydrides gave 2-a
Ring closure reactions of 5-azidopyrido[2,3-d]pyrimidinetriones to isoxazolo- and oxadiazolopyrido[2,3-d]pyrimidinetriones
Van Tinh, Dang,Stadlbauer, Wolfgang
experimental part, p. 1695 - 1699 (2009/09/06)
(Chemical Equation Presented) Thermal decomposition of 5-azidopyrido[2,3-d] pyrimidines 2 and 7 having reactive ortho-substituents such as a formyl or a nitro group yielded isoxazolo[3′,4′:4,5]pyrido[2,3-d]pyrimidines 3 or oxadiazolo-[3′,4′:4,5]pyrido[2,3-d]pyrimidines 9. The reaction conditions of the azide decomposition were studied by differential scanning calorimetry (DSC). In addition, desoxygenation of N-oxides 9 to oxadiazoles 10 and regioselective reduction of azides 7 to amines 8 were studied.
