Enantioselective Hydroazidation of Trisubstituted Non-Activated Alkenes
作者:Daniel Meyer、Philippe Renaud
DOI:10.1002/anie.201703340
日期:2017.8.28
A one-pot procedure for the enantioselective hydroazidation of non-activated trisubstituted alkenes is described. Hydroboration with monoisopinocampheylborane (IpcBH2) provides dialkylboranes that are in situ selectively converted into monoalkyl-substituted catecholboranes; these undergo radical azidation upon treatment with benzenesulfonyl azide and a radical initiator. Enantiomerically enriched azides
Alcohol dehydrogenases can act as powerful catalysts in the preparation of opticallypure γ-hydroxy-δ-lactones by means of an enantioconvergent dynamic redox isomerization of readily available Achmatowicz-type pyranones. Imitating the traditionally metal-mediated "borrowing hydrogen" approach to shuffle hydrides across molecular architectures and interconvert functional groups, this chemoinspired and
A Short Synthesis of (+)‐Brefeldin C through Enantioselective Radical Hydroalkynylation
作者:Lars Gnägi、Severin Vital Martz、Daniel Meyer、Robin Marc Schärer、Philippe Renaud
DOI:10.1002/chem.201903392
日期:2019.9.6
starting from 2-furanylcyclopentene is described. This approach is based on an unprecedented enantioselectiveradical hydroalkynylation process to introduce the two cyclopentane stereocenters in a single step. The use of a furan substituent allows a high trans diastereoselectivity to be achieved during the radicalprocess and it contains the four carbon atoms C1-C4 of the natural product in an oxidation state
Studies on the effects of substituents on rate enhancements in intramolecular diels-alder reactions: Reasons for the gem-dimethyl effect
作者:Michael E. Jung、Jacquelyn Gervay
DOI:10.1016/s0040-4039(00)87899-5
日期:1988.1
Comparison of the rates of cyclization of a series of 2-furfuryl methyl fumarates leads to the conclusion that the gem-dimethyl effect is due primarily to higher population of reactive rotamers.
A BINOL-phosphoric acid-catalyzed furylogous Pinacolrearrangement is developed. This reaction produces spiro cyclopentanone in good yields under mild conditions. The enantioselective version of this reaction is also investigated using chiral phosphoric acid (CPA) as the catalyst.