One-pot synthesis of thia-Michael products from thio acids, epoxides, and electron-deficient alkenes promoted by a silica gel/Et3N combined catalyst

Thiol-free multicomponent synthesis of non-racemic β-acyloxy thioethers from biocatalytically obtained chiral halohydrins

A novel multicomponent chemoenzymatic strategy for the preparation of enantioenriched β-acyloxy thioethers has been developed. This robust methodology employs mild bases, air atmosphere, room temperature and avoids the use of foul-smelling thiols. Instead, potassium thioacetate is employed as a universal sulfur source. This chemoselective strategy tolerates aromatic and aliphatic components and diverse functional groups. The chirality is enzymatically defined by ADH-catalyzed bioreduction of α-haloketones delivering an enantioenriched halohydrin which is one of the three components, and the optical purity remains untouched in the final product. Semipreparative scale multicomponent reaction affords high yield of the products (up to 96%).

Thio-Michael addition of α,β-unsaturated amides catalyzed by Nmm-based ionic liquids

Most substrates work well for this transformation in water, and the IL-catalyst is recyclable and applicable for gram-scale synthesis.

The synthesis of symmetrical disulfides by reacting organic halides with Na2S2O3·5H2O in DMSO

Symmetrical disulfides were prepared by heating organic halides with Na₂S₂O₃ in DMSO in high yields and good purities.

One-pot odourless synthesis of thioesters via in situ generation of thiobenzoic acids using benzoic anhydrides and thiourea

An efficient and odourless procedure for a one-pot synthesis of thioesters by the reaction of benzoic anhydrides, thiourea and various organic halides (primary, allylic, and benzylic) or structurally diverse, electron-deficient alkenes (ketones, esters, and nitriles) in the presence of Et3N has been developed. In this method, thiobenzoic acids were in situ generated from the reaction of thiourea with benzoic anhydrides, which were subjected to conjugate addition with electron-deficient alkenes or a nucleophilic displacement reaction with alkyl halides.