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16.22.4.1.1.1.1.5 Variation 5: With Diethoxymethyl Acetate

DOI: 10.1055/sos-SD-016-01695

Ishikawa, T.Science of Synthesis, (2004161370.

Effective cyclization has been reported when using diethoxymethyl acetate as a carbon source. Heating 5-amino-2-chloropyrimidine-4-carboxamide (104) with diethoxymethyl acetate affords 6-chloropyrimido[5,4-d]pyrimidin-4(3H)-one (105) in 81% yield (Scheme 73).[‌119‌]

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