Efficient Copper-Catalyzed Synthesis of<i>N</i>-Alkylanthranilic Acids<i>via</i>an<i>ortho</i>-Substituent Effect of the Carboxyl Group of 2-Halobenzoic Acids at Room Temperature
We have developed an efficient copper‐catalyzed method for the synthesis of N‐alkylanthranilic acids. The protocol uses inexpensive copper(I) iodide/racemic 1,1′‐binaphthyl‐2,2′‐diol (rac‐BINOL) as the catalyst/ligand system, readily available 2‐halobenzoic acids and aliphatic amines as the starting materials, the coupling reactions were performed at room temperature, and various functionalities in
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.