One-pot chemo/regio/stereoselective generation of a library of functionalized spiro-oxindoles/pyrrolizines/pyrrolidines from α-aroylidineketene dithioacetals
Abstract A series of styryldyes: 2‐substituted styryl benzimidazole and α‐methyl‐2‐substituted styryl benzimidazole were synthesized under solvent‐free microwave irradiation by the condensation of 2‐methylbenzimidazole or 2‐ethylbenzimidazole with aromatic aldehydes in the presence of Ac2O.