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.
Structure-Based Design, Synthesis, and Biological Evaluation of Irreversible Human Rhinovirus 3C Protease Inhibitors. 3. Structure−Activity Studies of Ketomethylene-Containing Peptidomimetics
作者:Peter S. Dragovich、Thomas J. Prins、Ru Zhou、Shella A. Fuhrman、Amy K. Patick、David A. Matthews、Clifford E. Ford、James W. Meador、Rose Ann Ferre、Stephen T. Worland
DOI:10.1021/jm980537b
日期:1999.4.1
rhinovirus (HRV) 3C protease (3CP) inhibitors are described. These compounds are comprised of a peptidomimetic binding determinant and an ethyl propenoate Michael acceptor moiety which forms an irreversible covalent adduct with the active site cysteine residue of the 3C enzyme. The ketomethylene-containing inhibitors typically display slightly reduced 3CP inhibition activity relative to the corresponding
pungent principle of hot pepper, and its 15 analogs have been efficiently synthesized. The key step of this synthetic sheme is the orthoester Claisen rearrangement, which transformed allylic alcohols 2A-C to (E)-alkenoates 3A-C () in a highly stereoselective manner. The subsequent carbon chain elongations on 3 based on the cyanation or the malonic acid estersynthesis afforded (E)-alkenoic acids 8, which