Publikation: Facile Synthesis of 6-Aryl-1,3-dimethyl-5H-pyrimido[4,5-b][1,4]diazepine-2,4(1H,3H)-diones
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A facile procedure for the preparation of 6-aryl-1,3-dimethyl-5H-pyrimido[4,5-b][1,4]diazepine2,4(1H,3H)-diones 8, 9 from 6-amino-5-arylideneamino-1,3-dimethyluracils 1, 2 and triethyl orthoacetate (3) in a two-step reaction via 6-aryl-8-ethoxy-6,7-dihydro-1,3-dimethyl-5H-pyrimido[4,5-b][1,4]diazepine-2,4(1H,3H)-diones 6, 7 is described. Condensation of 1 with diethoxymethyl acetate (10) resulted in the formation of (1,3-dimethyl-2,6-(1H,3H)-dioxopurin-7-yl)(phenyl)methyl acetate (11) and a small amount of 1,3-dimethyl-6-phenylpyrazino[2,3-d]pyrimidine-2,4(1H,3H)-dione (12). The structures of 6 and 11 were unambiguously confirmed by single-crystal X-ray diffraction analysis.
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TAGHAVI-MOGHADAM, Shahriyar, Rüdiger STUMPF, Helmut FISCHER, Wolfgang PFLEIDERER, 1999. Facile Synthesis of 6-Aryl-1,3-dimethyl-5H-pyrimido[4,5-b][1,4]diazepine-2,4(1H,3H)-diones. In: Collection of Czechoslovak Chemical Communications. 1999, 64(2), pp. 313-320. ISSN 0010-0765. eISSN 1212-6950. Available under: doi: 10.1135/cccc19990313BibTex
@article{TaghaviMoghadam1999Facil-23043, year={1999}, doi={10.1135/cccc19990313}, title={Facile Synthesis of 6-Aryl-1,3-dimethyl-5H-pyrimido[4,5-b][1,4]diazepine-2,4(1H,3H)-diones}, number={2}, volume={64}, issn={0010-0765}, journal={Collection of Czechoslovak Chemical Communications}, pages={313--320}, author={Taghavi-Moghadam, Shahriyar and Stumpf, Rüdiger and Fischer, Helmut and Pfleiderer, Wolfgang} }
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