Sodium Sulfite-Involved Photocatalytic Radical Cascade Cyclization of 2-Isocyanoaryl Thioethers: Access to 2-CF2/CF3-Containing Benzothiazoles
A visible-light-induced radical cascade cyclization of 2-isocyanoaryl thioethers for the synthesis of 2-CF2/CF3-containing benzothiazoles has been developed. Sodium sulfite can participate in the photocatalytic cycle as a reductant that efficiently transforms Ir4+ into Ir3+ to promote the fluoroalkylation under mild reaction conditions.
A general and straightforward method for the synthesis of 2-trifluoromethylbenzothiazoles
An efficient one-pot method for the synthesis of 2- trifluoromethylbenzothiazoles by the treatment of trifluoromethylimidoyl chlorides with sodium hydrosulfide hydrate using PdCl2 as the sole catalyst in DMSO is described. The reaction proceeds via thiolation/C-H bond functionalization/C-S bond formation in moderate to high yields with good functional group tolerance.