Optically active 2,3-epoxy sulfides as precursors to 3-hydroxy-1,2-dithioethers and 3-hydroxy-1-alkenylthioethers
作者:Ian Forristal、Kevin R. Lawson、Christopher M. Rayner
DOI:10.1016/s0040-4039(99)01427-6
日期:1999.9
Procedures are reported far the conversion of 2,3-epoxysulfides to 3-hydroxy-1,2-dithioethers. Conventional nucleophilic ring opening using a thiolate gives a mixture of products resulting from ring opening at C-2 and C-3, with the latter predominating. With sodium thiolates in DMF a competing beta-elimination process is observed to form 3-hydroxy-1-alkenylthioethers. Alternatively, Lewis acid induced thiiranium ion generation from a 2,3-epoxy sulfide, and nucleophilic ring opening with S-trimethylsilylthiophenol gives 3-hydroxy-1,2-dithioethers with full regio- and stereo-control. (C) 1999 Elsevier Science Ltd. All rights reserved.