Smyth, Richard M.; Williams, Andrew, Journal of the Chemical Society. Perkin transactions II, 1993, # 11, p. 2171 - 2174
作者:Smyth, Richard M.、Williams, Andrew
DOI:——
日期:——
Mechanism of Alkaline Cyclization of 2-(Substituted benzamido)benzamides to 4-Quinazolinones
作者:Barry Gardner、Angeline J. S. Kanagasooriam、Richard M. Smyth、Andrew Williams
DOI:10.1021/jo00100a026
日期:1994.10
The title amides cyclize rapidly to the corresponding quinazolin-4-ones in aqueous alkaline solution at 25 degrees C; the pseudo-first-order rate constants fit the empirical equation k(obs) = k(max) [OH-]/K-m + [OH-] + [OH-]K-2(m')) where K-m' is essentially zero for all except the 4-nitro species. The value of K-m measures the ionization of the neutral amide 1 to nonproductive conjugate base 2. Studies of the cyclization in alkali of 2-benzamido-N-methylbenzamide (1i) and 2-(N-methylbenzamido)benzamide (1j) indicate that 7 carries over 99% of the reaction flux and that the tautomer 8 does not contribute significantly. The ratio k(max)/K-m, is a composite rate constant first order in 1 and first order in [OH-]. The value of the Hammett rho for k(max)/K-m (0.67) is consistent with the above scheme where decomposition of 7 is rate limiting.
Kidwai, Mazaahir; Priya, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2008, vol. 47, # 12, p. 1876 - 1881