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- W2055919616 abstract "For the synthesis of 5-phenyl-1,4-benzodiazepines, reaction of quinazolinium salts with diazomethane was studied. In the course of the study, it was found by NMR spectroscopy that the starting materials (2) reacted even with a slight amount of water present in the solvent to give hydrates 5. Treatment of 2c with diazomethane at 10 °C under absolute anhydrous conditions gave quinazoline 8c and benzodiazepines 9 and 10c in about the same ratio. In the reactions at lower temperatures, the distribution of the products varied markedly, and the ring expansion product 10c was obtained in an improved yield. The mechanism for the formation of 8, 9, and 10 was discussed." @default.
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- W2055919616 date "1974-02-01" @default.
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- W2055919616 title "Reaction of 1-Methyl-4-phenylquinazolinium Salts with Diazomethane" @default.
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- W2055919616 doi "https://doi.org/10.1246/bcsj.47.343" @default.
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