Synthesis of 3-amino-3,4-dihydroquinazolin-4-one derivatives from anthranilic acid hydrazide and dicarboxylic acids
摘要:
Treatment of anthranilic acid hydrazide with 2 equiv of ethoxalyl chloride gave the corresponding diester which underwent cyclization in acetic anhydride to produce ethyl 3-(ethoxalylamino)-4-oxo-3,4-dihydroquinazoline-2-carboxylate. Acylation of anthranilic acid hydrazide first with succinic anhydride and then with ethoxalyl chloride led to the formation of 4-[2-(2-{[ethoxy(oxo)acetyl]amino) benzoyl)hydrazino]-4-oxobutanoic acid whose cyclization in acetic acid afforded N-(2-ethoxycarbonyl-4-oxo-3,4-dihydroquinazolin-3-yl)succinamic acid, while in acetic anhydride ethyl 3-(2,5-dioxopyrrolidin-1-yl)-4-oxo-3,4-dihydroquinazoline-2-carboxylate was obtained. The latter was brought into reactions with amines and hydrazine hydrate and alkaline hydrolysis. Acylation of 2-[2-(2-aminobenzoyl)hydrazinocarbonyl]benzoic acid with ethoxalyl chloride gave ethyl N-[2-(phthalimidocarbamoyl)phenyl]oxamate, and with succinic anhydride, 3-[4-oxo-3-phthalimido-3,4-dihydroquinazolin-2-yl]propionic acid. 4-[2-(2-Aminobenzoyl)hydrazino]-4-oxobutanoic acid reacted with phthalic anhydride in boiling acetic acid to give phthalazino[1,2-b]quinazoline-5,8-dione via elimination of succinic acid residue.
Reddy, P. S. N.; Reddy, V. Gopal, Synthetic Communications, 1990, vol. 20, # 1, p. 23 - 33
作者:Reddy, P. S. N.、Reddy, V. Gopal
DOI:——
日期:——
Gakhar; Sangeeta; Gupta, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1990, vol. 29, # 2, p. 174 - 175
作者:Gakhar、Sangeeta、Gupta、Gupta
DOI:——
日期:——
Pathak, U. S.; Rathod, I. S.; Patel, M. B., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1995, vol. 34, # 7, p. 617 - 623
作者:Pathak, U. S.、Rathod, I. S.、Patel, M. B.、Shirsath, V. S.、Jain, K. S.
DOI:——
日期:——
GAKHAR, H. K.;SANGEETA;GUPTA, RAMAN;GUPTA, SHASHI BHUSHAN, INDIAN J. CHEM. B , 29,(1990) N, C. 174-175
作者:GAKHAR, H. K.、SANGEETA、GUPTA, RAMAN、GUPTA, SHASHI BHUSHAN
DOI:——
日期:——
Synthesis of 3-amino-3,4-dihydroquinazolin-4-one derivatives from anthranilic acid hydrazide and dicarboxylic acids
作者:L. A. Shemchuk、V. P. Chernykh、P. S. Arzumanov、I. L. Starchikova
DOI:10.1134/s1070428007120160
日期:2007.12
Treatment of anthranilic acid hydrazide with 2 equiv of ethoxalyl chloride gave the corresponding diester which underwent cyclization in acetic anhydride to produce ethyl 3-(ethoxalylamino)-4-oxo-3,4-dihydroquinazoline-2-carboxylate. Acylation of anthranilic acid hydrazide first with succinic anhydride and then with ethoxalyl chloride led to the formation of 4-[2-(2-[ethoxy(oxo)acetyl]amino) benzoyl)hydrazino]-4-oxobutanoic acid whose cyclization in acetic acid afforded N-(2-ethoxycarbonyl-4-oxo-3,4-dihydroquinazolin-3-yl)succinamic acid, while in acetic anhydride ethyl 3-(2,5-dioxopyrrolidin-1-yl)-4-oxo-3,4-dihydroquinazoline-2-carboxylate was obtained. The latter was brought into reactions with amines and hydrazine hydrate and alkaline hydrolysis. Acylation of 2-[2-(2-aminobenzoyl)hydrazinocarbonyl]benzoic acid with ethoxalyl chloride gave ethyl N-[2-(phthalimidocarbamoyl)phenyl]oxamate, and with succinic anhydride, 3-[4-oxo-3-phthalimido-3,4-dihydroquinazolin-2-yl]propionic acid. 4-[2-(2-Aminobenzoyl)hydrazino]-4-oxobutanoic acid reacted with phthalic anhydride in boiling acetic acid to give phthalazino[1,2-b]quinazoline-5,8-dione via elimination of succinic acid residue.