Parallel Approaches for the Functionalization of Thietes: α-Metalation versus C-H Activation.

For the first time, an approach to 3,4-disubstituted thietes was developed through two complementary paths. While the first one relies on α-metalation, the second is based on direct C-H functionalization. A new library of sophisticated sulfur-containing four-membered rings is described, paving the way to new bioactive analogues and small heterocycle incorporation.