New Applications of Hetaryl Thioketones for the Synthesis of Hetaryl-Substituted Ethenes via ‘Two-Fold Extrusion Reaction’
摘要:
A series of aryl/hetaryl thioketones was applied for the reactions with aryl/hetaryldiazomethanes yielding, after elimination of N-2, the corresponding thiiranes. The relatively unstable dihetaryldiazomethanes were generated in situ from the corresponding hydrazones by oxidation with DMSO. The obtained thiiranes were converted into tetraaryl/hetaryl-substituted ethenes in good yields by desulfurization performed with tris(diethylamino)phosphine ((Et2N)(3)P).
Oxidation of hydrazones to the corresponding diazo compound
申请人:Glaxo Laboratories Limited
公开号:US04083837A1
公开(公告)日:1978-04-11
A process for the preparation of diazo compounds, particularly diazoalkanes, is described in which a hydrazone is oxidized with an oxidizing agent, said oxidizing agent comprising an organic peracid, chloramine-T or N-chlorosuccinimide to a corresponding diazo compound, preferably in the presence of a base. The reaction may be catalyzed by an oxidation catalyst such as iodine.