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- W1998522080 abstract "The condensation of phthalic anhydride with 1,3-propanediamine afforded N-(o-carboxybenzoyl)-1,3-propanediamine (I) which by intravolecular cyclization was transformed into 2,3,4,6-b-tetrahydropyrimido[2,1-a]isoindol-6-one (II) rather than the benzodiazonine (III). An intermediate in the condensation is proposed. The reaction of 1,3-propanediamine with dimethyl phthalate also did not afford III, but rather a more complex product, dibenzo[c,l]-1,6,10,15-tetraazacyclooctadecane-5,11,16,22-tetraone (IX). Reaction of 1,3-propanediamine with phthaloyl chloride gave 6,13-propanodibenz[c,h]-1,6-diazecine-5,7,12,14-tetrone (XII). Spectroscopic data of the heterocycles obtained and chemical properties of II are given." @default.
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- W1998522080 date "1972-08-01" @default.
- W1998522080 modified "2023-09-23" @default.
- W1998522080 title "Heterocycles derived from the condensation of 1,3-propanediamine with phthalic acid derivatives" @default.
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- W1998522080 doi "https://doi.org/10.1002/jhet.5570090422" @default.
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