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.
The enantioselective organocatalytic conjugate alkenylation of β-substituted alkenyl benzimidazoles afforded β-stereogenic 2-alkyl benzimidazole derivatives in excellent enantioselectivities. Chiral binaphthols were effective catalysts for promoting the nucleophilic addition of bench-stable alkenyl trifluoroborate salts under mild conditions, expanding their applications by utilizing C=N-containing