Under acidic conditions zinc reduces diselenides to afford selenols, which can be either isolated or treated in situ with alkyl halides to produce alkyl selenides or with epoxides to give β-hydroxyselenides.
One-Pot Synthesis of β-Amino/β-Hydroxy Selenides and Sulfides from Aziridines and Epoxides
作者:Srinivasan Chandrasekaran、Venkataraman Ganesh
DOI:10.1055/s-0029-1216960
日期:2009.10
Diaryl disulfides and diselenides undergo facile cleavage on treatment with rongalite (sodium hydroxymethanesulfinate) to generate the corresponding thiolate and selenolate species in situ, which effect the ring opening of aziridines and epoxides in a regioselective manner. A simple, mild, cost-effective protocol has been developed to prepare β-amino and β-hydroxy sulfides and selenides in a one-pot operation.
Tetrahydrofuran Derivatives from Epoxides <i>via</i> Group Transfer Cyclization or Reductive Radical Cyclization of Organotellurium and Organoselenium Intermediates
作者:Lars Engman、Vijay Gupta
DOI:10.1021/jo961578n
日期:1997.1.1
undergo grouptransfer cyclization to afford 2-substituted 4-[(aryltelluro)methyl]tetrahydrofurans (cis/trans = 1/3-1/10). The aryl beta-(prop-2-ynyloxy)alkyl tellurides similarly afforded 2-substituted 4-[(aryltelluro)methylene]tetrahydrofurans with an E/Z-ratio close to unity. The beta-(allyloxy)alkyl aryl selenides and aryl beta-(prop-2-ynyloxy)alkyl selenides failed to undergo grouptransfer cyclization
When tributylstannyl phenylselenolate (Bu3SnSePh) was allowed to react with epoxides in the presence of BF3·OEt2 as a Lewis acid, the ring opening reaction of epoxides proceeded with complete regioselectivity to afford the β-hydroxy phenylselenides in moderate to good yields.
Lipase-catalyzed resolution of β-hydroxy selenides
作者:Michelangelo Gruttadauria、Paolo Lo Meo、Serena Riela、Francesca D’Anna、Renato Noto
DOI:10.1016/j.tetasy.2006.10.010
日期:2006.10
Eleven beta-hydroxy selenides were kinetically resolved using an immobilized lipase (Amano PS-C II) in toluene in the presence of vinyl acetate at 30 degrees C. This approach provided, in several cases, both enantiomers in high enantiomeric excess. The role of the size of substituents and the behaviour of cyclic beta-hydroxy selenides is also discussed. Enantiopure beta-hydroxy selenides are useful building blocks. As an application of this chemistry, enantiopure (1S,2R)-indene oxide was obtained in one step from the proper enantiopure beta-hydroxy selenide. (c) 2006 Published by Elsevier Ltd.