35671-18-2Relevant academic research and scientific papers
Switching the reaction pathways of electrochemically generated β-haloalkoxysulfonium ions - Synthesis of halohydrins and epoxides
Shimizu, Akihiro,Hayashi, Ryutaro,Ashikari, Yosuke,Nokami, Toshiki,Yoshida, Jun-Ichi
supporting information, p. 242 - 248 (2015/06/01)
β-Haloalkoxysulfonium ions generated by the reaction of electrogenerated Br+ and I+ ions stabilized by dimethyl sulfoxide (DMSO) reacted with sodium hydroxide and sodium methoxide to give the corresponding halohydrins and epoxides, respectively, whereas the treatment with triethylamine gave α-halocarbonyl compounds.
Epoxidation of olefins by β-bromoalkoxydimethylsulfonium ylides
Majetich, George,Shimkus, Joel,Li, Yang
supporting information; experimental part, p. 6830 - 6834 (2011/03/18)
Olefins can be converted to their respective epoxides in a one-pot procedure by dissolving the olefin in anhydrous DMSO, adding NBS to the reaction mixture to generate a β-bromoalkoxydimethylsulfonium ylide, and then adding DBU to the reaction mixture. A large variety of alkenes were successfully epoxi-dized with yields largely dependent on the structure of the alkene. Most importantly, the facial selectivity of this one-pot process is the opposite of that observed when using traditional epoxidizing reagents. Electron-poor alkenes are not epoxidized under these conditions.
Diastereoselective epoxidation of olefins by organo sulfonic peracids, II
Kluge,Schulz,Liebsch
, p. 2957 - 2976 (2007/10/03)
We have investigated the behaviour of sulfonic peracids 2 in situ generated towards olefins 7a, 7b, 9, 11, 14, 16, 18, allylic acid and homoallylic alcohols 20, 22, 24, 26, 28, 30, 33 and α,β-unsaturated ketones 35, 37, 39. Generally, the epoxidation proceeds in a peracid-like manner with greater diastereoselectivity than those by common oxidants. In particular, the epoxidation of Δ4 3-ketosteroids 39a-i led to 4α,5α-epoxides 40a-i with remarkable high de-values. Enhanced α-selectivity was also found in the epoxidation of cholesterol 28b. Due to the mild reaction conditions, even acid sensitive epoxides 8a, 8b, 10, 12, 13, 15, 17, 19 were obtained in good yields.
A NEW PARADIGM FOR ALKENE EPOXIDATION. ACTIVATION OF HYDROGEN PEROXIDE BY ORGANOPHOSPHORUS ELECTROPHILES
Kende, Andrew S.,Delair, Philippe,Blass, Benjamin E.
, p. 8123 - 8126 (2007/10/02)
Diphenylphosphinic anhydride and certain other organophosphorus electrophiles mediate the high-yield conversion of alkenes to epoxides by hydrogen peroxide in buffered aqueous tetrahydrofuran.
Synthesis of naturally-occurring (-)-Δ9(12)-Capnellene and its antipode: An application of the photo-induced vinylcyclopropane-cyclopentene rearrangement
Sonawane,Nanjundiah,Shah,Kulkarni,Ahuja, Jaimala R.
, p. 1107 - 1108 (2007/10/02)
Abundantly available (+)-Δ3-Carene, 1 has been transformed into enantiomerically pure key intermediates viz. the enones (-)-7 and (+)-7, thus constituting a formal synthesis of both the enantiomers of Δ9(12)-Capnellene.
