The cdc25A protein phosphatase inhibitor dysidiolide (1) has been synthesized via intermolecular Diels-Alder reaction of the triene 4 with crotonaldehyde and construction of a quaternary carbon center by methylation of the exocyclic enolate. (C) 2000 Elsevier Science Ltd. All rights reserved.
作者:Douglas C. Behenna、Justin T. Mohr、Nathaniel H. Sherden、Smaranda C. Marinescu、Andrew M. Harned、Kousuke Tani、Masaki Seto、Sandy Ma、Zoltán Novák、Michael R. Krout、Ryan M. McFadden、Jennifer L. Roizen、John A. Enquist、David E. White、Samantha R. Levine、Krastina V. Petrova、Akihiko Iwashita、Scott C. Virgil、Brian M. Stoltz
DOI:10.1002/chem.201003383
日期:2011.12.9
functions with nearly identical efficiency in terms of yield and enantioselectivity. Catalyst discovery and development, the optimization of reaction conditions, the exploration of reactionscope, and applications in target‐directed synthesis are reported. Experimental observations suggest that these alkylationreactions occur through an unusual inner‐sphere mechanism involving binding of the prochiral
Synthesis of Racemic and Enantiomerically Pure Acetylenic ω-Keto Esters Derived from 2-Methyl-1,3-cycloalkanediones and 2-Methylcycloalkanones Respectively
Racemic and enantiomericallypure alkynyl esters tethered, respectively, to 2-methyl-1,3-cycloalkanediones and 2-methylcycloalkanones were readily obtained starting from common intermediates, which were available on large scale. alkynyl ester - enantiomer-chain - elongation - trimethylsilylpropyne - Corey-Fuchs reaction
Asymmetric Synthesis of Polyfunctionalized Allenic Esters: Toward the Synthesis of an Iphionane Sesquiterpene
作者:Michel Miesch、Aurélie Klein
DOI:10.1055/s-2006-942463
日期:2006.8
smoothly with optically active acetylenic ω-keto esters to afford optically active allenicesters (ee >95%) in high yield. After protection of the hydroxyl group, the addition of morpholine followed by an acidic hydrolysis, quantitatively led to optically active bicyclic α,β-unsaturated ketones (ee >95%). By using this methodology, the formal synthesis of an iphionane sesquiterpene was achieved.
The first catalytic enantioselective examples of the Tsuji allylation using enol carbonates and enol silanes are described. The products possess a quaternary stereogenic center and are useful building blocks for synthetic chemistry.
Silver-Catalyzed 7<i>-exo-</i>
dig Cyclization of Silylenolether-ynesulfonamides
作者:Clément F. Heinrich、Indira Fabre、Laurence Miesch
DOI:10.1002/anie.201510708
日期:2016.4.18
AbstractCyclization of silylenolether‐ynesulfonamides proceeds at ambient temperature under mild reaction conditions under silver catalysis. Bridged compounds were obtained exclusively through 7‐exo‐dig reactions. The protocol is applicable to a wide range of substrates, thus leading to azabicyclic frameworks.