New Uses for the Burgess Reagent in Chemical Synthesis: Methods for the Facile and Stereoselective Formation of Sulfamidates, Glycosylamines, and Sulfamides
作者:K. C. Nicolaou、Scott A. Snyder、Deborah A. Longbottom、Annie Z. Nalbandian、Xianhai Huang
DOI:10.1002/chem.200400503
日期:2004.11.19
Although the Burgess reagent (methoxycarbonylsulfamoyltriethylammonium hydroxide, inner salt) has found significant use in chemical synthesis as a dehydrating agent, almost no work has been directed towards its potential in other synthetic applications. As this article will detail, we have found that the Burgess reagent is remarkably effective at accomplishing a number of non-dehydrative synthetic
The Use of pH to Influence Regio- and Chemoselectivity in the Asymmetric Aminohydroxylation of Styrenes
作者:Vitaliy Nesterenko、Joshua T. Byers、Paul J. Hergenrother
DOI:10.1021/ol027242j
日期:2003.2.1
[reaction: see text] The pH-controlled Sharplessasymmetricaminohydroxylation (AA) of styrenes provides 1-aryl-2-amino ethanols (regioisomer B) with high enantio-, chemo-, and regioselectivity. As existing AA protocols typically give regioisomer A as the major reaction product when using carbamate nitrogen sources, this method is a convenient alternative for the selective production of regioisomer
Bismuth(III)-catalyzed oxidative cleavage of aryl epoxides: Substituent effects on the kinetics of the oxidation reaction
作者:Véronique Le Boisselier、Elisabet Duñach、Michèle Postel
DOI:10.1016/0022-328x(94)88192-8
日期:1994.11
Bismuth(III)mandelate catalyses the oxidative CC bond cleavage of a series of styrene epoxides in DMSO, to the corresponding aryl carboxylic acids. The reaction is accelerated in the presence of electron-donating groups substituting the phenyl ring. A good Hammet correlation of log kobs, versus σ has been obtained, with a ϱ of −1.08.
NaIO<sub>4</sub>/LiBr-mediated Diastereoselective Dihydroxylation of Olefins: A Catalytic Approach to the Prevost−Woodward Reaction
作者:Lourdusamy Emmanuvel、Tanveer Mahammad Ali Shaikh、Arumugam Sudalai
DOI:10.1021/ol052080n
日期:2005.10.1
LlBr catalyzes efficiently the dihydroxylation of alkenes to afford syn and anti diols with excellent diastereoselectivity depending upon the use of NaIO4 (30 mol %) or Phl(OAc)(2) (1 equiv), respectively, as the oxidants. The oxidation of non-benzylic halides has been achieved for the first time to afford the corresponding diols in excellent yields.
A Novel Regio- and Stereoselective Synthesis of Sulfamidates from 1,2-Diols Using Burgess and Related Reagents: A Facile Entry into β-Amino Alcohols We thank Professor K. Barry Sharpless for the gracious donation of several of the starting diol substrates. We also thank Drs. D. H. Huang, G. Suizdak, and R. Chadja for NMR spectroscopic, mass spectrometric, and X-ray crystallographic assistance, respectively. Financial support for this work was provided by The Skaggs Institute for Chemical Biology, predoctoral fellowships from the National Science Foundation and Pfizer (S.A.S.), a postdoctoral fellowship from The Skaggs Institute for Chemical Biology (X.H.), and grants from American Biosciences, Amgen, Array Biopharma, Boehringer-Ingelheim, Glaxo, Hoffman-LaRoche, DuPont, Merck, Novartis, Pfizer, and Schering Plough.
作者:K. C. Nicolaou、Xianhai Huang、Scott A. Snyder、Paraselli Bheema Rao、Marco Bella、Mali V. Reddy