O,ω‐Unsaturated N‐tosyl alkoxyamines undergo unexpected RhIII‐catalyzed intramolecular cyclization by oxyamination to produce oxygen‐containing heterocycles. Mechanistic studies show that an aziridine intermediate seems to be responsible for the formation of the heterocycles, possibly via a RhV species.
The present invention features compounds of formula (I): and salts thereof, pharmaceutical compositions comprising said compounds, and uses of such compounds in treating or preventing viral infections, such as HCV infections, and diseases associated with such infections.
作者:Michael A. Schafroth、Stephan M. Rummelt、David Sarlah、Erick M. Carreira
DOI:10.1021/acs.orglett.7b01346
日期:2017.6.16
systems enabled through the combination of Lewis acid activation and iridium-catalyzedallylicsubstitution is described. The reaction proceeds with branched, allylic alcohols and carbon nucleophiles as well as heteronucleophiles to give a diverse set of ring systems in good yields and with high enantioselectivities. The utility of the method is highlighted by the asymmetric syntheses of erythrococcamides
Remote Control of Regio- and Diastereoselectivity in the Hydroformylation of Bishomoallylic Alcohols with Catalytic Amounts of a Reversibly Bound Directing Group
作者:Christian U. Grünanger、Bernhard Breit
DOI:10.1002/anie.200905949
日期:2010.1.25
Remote and reversible! Phosphinites serve as reversiblybounddirectinggroups for the remotecontrol of the regio‐ and diastereoselectivehydroformylation of bishomoallylicalcohols (see scheme; r.r: regioisomer ratio). The distance between the double bond and the functional hydroxy group to which the directinggroup is reversiblybound is the longest ever reported.
A Ring‐Closing Metathesis Approach to Cyclic α,β‐Dehydroamino Acids
作者:Koen F. W. Hekking、Dennis C. J. Waalboer、Marcel A. H. Moelands、Floris L. van Delft、Floris P. J. T. Rutjes
DOI:10.1002/adsc.200700308
日期:2008.1.4
the synthesis and ring-closingmetathesis (RCM) of α,β-dehydroamino acids is described. This sequence has led to the formation of a range of biologically relevant functionalized nitrogen heterocycles. The incorporation of chiral building blocks in the RCM precursors eventually resulted in the formation of optically active 4-substituted cyclic dehydroamino acids. In addition, olefin isomerization under