Catalyst‐Free System for Sulfenylation of Free (N—H) Indoles with 2,2′‐Dithiosalicylic Acid under Alkaline Conditions.
2014
A catalyst-free system for the sulfenylation of free (N–H) indoles using 2,2′-dithiosalicylic acid under alkaline conditions was developed in this study. This system provides a green, convenient and efficient method for sulfenylindole synthesis, with good yields and high selectivity. This simple synthesis was performed in a green solvent (isopropanol/H2O) under atmospheric and catalyst-free conditions. The procedure was suitable for use with N-unprotected indoles. An electrophilic coupling mechanism was proposed.
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