Synthesis, Table of Contents Synthesis 2023; 55(03): 465-472DOI: 10.1055/a-1932-5811 paper New Efficient Synthesis of 6,12-Dihydro-5H-quinazolino[3,2-a] quinazolin-5-ones via Ugi/Staudinger/Aza-Wittig/Addition/Nucleophilic Acyl Substitution Sequence Mao-Lin Yang , Hao-Ran Chen , Long Zhao , Ming-Wu Ding ∗Recommend Article Abstract Buy Article All articles of this category Abstract A new efficient synthesis of 6,12-dihydro-5H-quinazolino[3,2-a]quinazolin-5-ones by sequential Ugi/Staudinger/aza-Wittig/addition/nucleophilic acyl substitution has been developed. α-Amino amides, obtained from Ugi-3CR of 2-azidobenzaldehydes, methyl 2-aminobenzoates, and isocyanides in the presence of catalytic amount of phenylphosphinic acid, reacted with triphenylphosphine and isocyanates to give 6,12-dihydro-5H-quinazolino[3,2-a]quinazolin-5-ones in good yields. This method provides a domino and effective strategy for the preparation of various substituted quinazolino[3,2-a]quinazolin-5-ones under mild reaction condition. Key words Key wordsquinazoline - 6,12-dihydro-5H-quinazolino[3,2-a]quinazolin-5-one - Ugi reaction - Staudinger reaction - aza-Wittig reaction Full Text References References 1a Ozaki KI, Yamada Y, Oine T. Chem. Pharm. Bull. 1984; 32: 2160 1b Ahmed Kamal A, Sattur PB. Arch. Pharm. (Weinheim) 1983; 316: 702 2 Zhang J, Liu J, Ma YM, Ren DC, Cheng P, Zhao JW, Zhang F, Yao Y. Bioorg. Med. Chem. Lett. 2016; 26: 2273 3 Aly MM, Mohamed YA, El-Bayouki KA, Basyouni WM, Abbas SY. Eur. J. Med. Chem. 2010; 45: 3365 4 Bouley R, Ding D, Peng ZH, Bastian M, Lastochkin E, Song W, Suckow MA, Schroeder VA, Wolter WR, Mobashery S, Chang M. J. Med. Chem. 2016; 59: 5011 5a Mohamed MA, Ayyad RR, Shawer TZ, Abdel-Aziz AA. M, El-Azab AS. Eur. J. Med. Chem. 2016; 112: 106 5b Huang W.-Y, Zhang X.-R, Lyu L, Wang S.-Q, Zhang X.-T. Bioorg. 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