Hypervalent Iodine(III)-Mediated Benzannulation of Enamines with Alkynes: an Efficient Synthesis of Substituted Aminonaphthoic Acid Derivatives

Autor: Zijing Bai, Yunyang Wei, Peng Gao, Mingjin Fan
Rok vydání: 2015
Předmět:
Zdroj: Chinese Journal of Chemistry. 33:479-485
ISSN: 1001-604X
DOI: 10.1002/cjoc.201400802
Popis: An intermolecular two CC bond formation procedure for the synthesis of carbocycles mediated by hypervalent iodine(III) reagents was developed. This metal free protocol provided a new approach for the synthesis of useful substituted 1-amino-2-naphthoic acid derivatives via benzannulation reactions. Various N-unsubstituted and N-alkyl substituted aromatic enamines with terminal alkynes and non-terminal alkynes can be converted into corresponding 1-amino-2-naphthoic acid derivatives under mild reaction conditions. When meta-substituted phenyl enamines were employed in the reaction, two cyclization paths were detected in the reaction and ortho-cyclization products were the only or major products. Good functional group tolerance, readily available material and high atom utilization efficiency make this method a potential procedure which may find broad application in organic synthesis.
Databáze: OpenAIRE