A novel and efficient synthesis of 3- and 2-substituted indoles starting from 2-(2-nitro-1-phenylethyl or 2-nitro-1-alkyl)cyclohexanones and 1,4-diketones, respectively, using a catalytic amount of Pd/C and 1-octene system is reported.
Key words
2- and 3- substituted indoles - Pd/C - 1-octene - one-pot synthesis - nitrone - 5-keto nitroalkanes - 1,4-diketone - ammonium acetate