A Practical and Efficient Vilsmeier Synthesis of 3-Chloroindole-2-carboxaldehydes
作者:Z. H. Li、Z. R. Hu、R. E. Chen、W. K. Su
DOI:10.1080/00304948.2010.514793
日期:2010.10.4
the Vilsmeier cyclization of 2[(carboxymethyl)amino]benzoic acids 1 has provided an effective and more convenient approach for the construction of indole derivatives without any metal catalysts, it suffers the disadvantages of low efficiency with some substrates and unsatisfactory yields.9 Herein, we disclose an efficient and practical process for the improved synthesis of 3-chloroindole2-carboxaldehydes