Borinic Acid/Halide Co-catalyzed Semipinacol Rearrangements of 2,3-Epoxy Alcohols
作者:Kashif Tanveer、Seung-Joon Kim、Mark S. Taylor
DOI:10.1021/acs.orglett.8b02248
日期:2018.9.7
A new mode of catalysis of the semipinacol rearrangement of 2,3-epoxy alcohols is described. In combination with a halide salt additive, diarylborinic acids promote a Type II rearrangement that occurs with net retention of configuration. This unusual stereochemical outcome is consistent with a mechanism involving regioselective ring opening of the epoxy alcohol by halide, followed by rearrangement
Highly efficient methods for the one-pot synthesis of β-substituted enones
作者:William J. Kerr、Colin M. Pearson、Graeme J. Thurston
DOI:10.1039/b512177a
日期:——
A mild and practically-convenient one-pot procedure for the direct beta-substitution of enones has been developed using a conjugate addition-oxidation strategy with a full range of copper-based reagents and N-tert-butylphenylsulfinimidoyl chloride; alkyl- and aryl-substituted enones are delivered in good to excellent yields.
Resolutions of endo-bicyclo[4.1.0]heptan-2-ols were achieved by acylation in the presence of lipase from Candida antarctica (Novozym(R)). The (1S,2R,6R) enantiomers reacted faster and the enantiomeric ratios were between 60 and 800 for the 6-substituted bicycloalkanols. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.