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For a previous report on the use of H2SO4 in the diazotization of 2- alkynylanilines 1 to give 4-cinnolinones, see Ref. 7f
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For a previous report on the use of H2SO4 in the diazotization of 2- alkynylanilines 1 to give 4-cinnolinones, see Ref. 7f .
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0027378315
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note
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4, and concentrated under reduced pressure. The crude product was purified by column chromatography over silica gel to give 5.
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See Supplementary data
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See Supplementary data.
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85030578700
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note
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2/MeOH 40:1, 20:1, 10:1) to give 18e and 18f. In the case of 18g, the product decomposed during chromatography, giving mostly 16f (hydrolysis). Accordingly, 18g could only be isolated in crude form.
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Tetrabutylammonium bromide can also be used but co-eluted with a number of products during column chromatography.
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Tetrabutylammonium bromide can also be used but co-eluted with a number of products during column chromatography.
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