Palladium-Catalyzed Mono-<i>N</i>-allylation of Unprotected Anthranilic Acids with Allylic Alcohols in Aqueous Media
作者:Hidemasa Hikawa、Yuusaku Yokoyama
DOI:10.1021/jo201691e
日期:2011.10.21
Palladium-catalyzed N-allylation of anthranilic acids 1a-j with allyl alcohol 2a in the presence of Pd(OAc)(2), sodium diphenylphosphinobenzene-3-sulfonate (TPPMS) in THF-H2O at room temperature gave only mono-N-allylated anthranilic acids 3a-j in good yields (70-98%). The reactions of 4-bromoanthranilic acid 1i with 2-methyl-3-buten-2-ol 2b showed complete chemoselectivity in N-allylation (neutral conditions) and C-vinylation (basic conditions). In our catalytic system, the keys to success are use of an unprotected anthranilic acid as a starting material and the presence of water in the reaction medium. The carboxyl group of anthranilic acid and water may play important roles for the smooth generation of the pi-allyl palladium species by activation of the hydroxyl group of the allylic alcohol.
Synthesis of 1-Substituted 4(1<i>H</i>)-Quinazolinones Under Solvent-Free Conditions
作者:Yao Wang、Mei Zhang、Shengli Cao、Huihui Lin、Man Gao、Zhongfeng Li
DOI:10.1080/00397911.2011.566407
日期:2012.9.15
Abstract Heating a mixture of 2-(N-alkylamino)benzoic acids, triethyl orthoformate, and ammonium acetate under solvent-free conditions generated 1-substituted 4(1H)-quinazolinones in 73−99% yields. Moreover, a possible reaction pathway was proposed. GRAPHICAL ABSTRACT