Superelectrophiles in Synthesis: Preparation of Aromatic Imides
作者:Sean H. Kennedy、Mark N. Schaeff、Douglas A. Klumpp
DOI:10.1021/acs.joc.9b01437
日期:2019.11.1
Aromatic carboxylic acids are found to undergo reactions with isocyanates, wherein triflic acid promotes the formation of aromatic imide products in fair to good yields. It is proposed that the carboxylic acid group directs the isocyanate electrophile to the ortho-position. This is thought to occur by the formation of a temporary carbamic acid anhydride group, which cleaves upon ortho-functionalization
A Rhodium-Catalyzed Cascade Cyclization: Direct Synthesis of<i>N</i>-Substituted Phthalimides from Isocyanates and Benzoic Acids
作者:Xian-Ying Shi、Andrea Renzetti、Soumen Kundu、Chao-Jun Li
DOI:10.1002/adsc.201300834
日期:2014.3.10
A rhodium(III)‐catalyzed amidation between benzoicacids and isocyanates via direct functionalization of an ortho CH bond followed by intramolecular cyclization is described. This cascadecyclization affords N‐substituted phthalimides in one step in 26–91% yields. The reaction is highly atom‐economical, since no theoretical waste except for water is generated in the reaction.
intermolecular [3 + 2] annulation pathway for aromatic acids with isocyanates to afford N-substituted phthalimide in one step is demonstrated, which provides an efficient process to direct preparation of phthalimidefrom commercially available starting materials and environmentally benign catalysts. This cascadecyclization involves the direct functionalization of an ortho C–H bond and the subsequent