Self-Condensation of N-tert-Butanesulfinyl Aldimines: Application to the Rapid Asymmetric Synthesis of Biologically Important Amine-Containing Compounds
摘要:
Highly diastereoselective intra- and intermolecular self-condensation reactions of N-tert-butanesulfinyl aldimines have been developed and applied to the rapid, asymmetric synthesis of trans-2-aminocyclopentanecarboxylic acid and the drug candidate SC-53116. Key to both syntheses is a novel microwave-assisted reaction in which N-sulfinyl aldimines are cleanly converted into nitriles in high-yielding concerted elimination processes.
Provided herein are compounds, such as a compound of Formula (I), as described herein, or a pharmaceutically acceptable salt thereof, that are immunoproteasome (such as LMP2 and LMP7) inhibitors. The compounds described herein can be useful for the treatment of diseases treatable by inhibition of immunoproteasomes. Also provided herein are pharmaceutical compositions containing such compounds and processes for preparing such compounds.
Influence of HMPA on the Stereochemical Outcome of the Addition of a Racemic Allenylzinc onto Enantiopure N-tert-Butanesulfinimines: Stereoselective Access to Enantiopurecis-Ethynylaziridines
作者:Franck Ferreira、Max Audouin、Fabrice Chemla
DOI:10.1002/chem.200500268
日期:2005.9.5
presence of 60 equivalents of HMPA, the condensation of the racemicallenylzinc derived from 1-chloro-3-trimethylsilylpropyne ontoenantiopure non-alpha-branched N-tert-butanesulfinimines was proven to give access to the corresponding cis-ethynylaziridines as the major products. The good cis selectivity observed presumably resulted from a high kinetic resolution with the allenylzinc being partially configurationally
A rapid and general method for the asymmetric synthesis of 2-substituted pyrrolidines using tert-butanesulfinamide
作者:Kristin M. Brinner、Jonathan A. Ellman
DOI:10.1039/b502080h
日期:——
A new method for the asymmetricsynthesis of 2-substituted pyrrolidines in three steps from commercially available starting materials is described. Addition of the Grignard reagent prepared from 2-(2-bromoethyl)-1,3-dioxane to N-tert-butanesulfinyl aldimines proceeds in high yields and with good diastereoselectivities. The sulfinamide products are then cleanly converted into pyrrolidines in one step
A Highly Efficient and Direct Approach for Synthesis of Enantiopure β-Amino Alcohols by Reductive Cross-Coupling of Chiral <i>N</i>-<i>tert</i>-Butanesulfinyl Imines with Aldehydes
作者:Yu-Wu Zhong、Yi-Zhou Dong、Kai Fang、Kenji Izumi、Ming-Hua Xu、Guo-Qiang Lin
DOI:10.1021/ja054401w
日期:2005.8.1
approach for the synthesis of optically pure beta-amino alcohols by the SmI2-induced reductive cross-coupling of chiral N-tert-butanesulfinyl imines with aldehydes was developed. This method allows the preparation of a broad range of chiral beta-amino alcohols, including functionalized ones under mild conditions. It provides a straightforward access to enantiopure beta-amino alcohols that are widely
Diastereoselective and Enantioselective Rh(I)-Catalyzed Additions of Arylboronic Acids to <i>N</i>-<i>tert</i>-Butanesulfinyl and <i>N</i>-Diphenylphosphinoyl Aldimines
作者:Daniel J. Weix、Yili Shi、Jonathan A. Ellman
DOI:10.1021/ja044003d
日期:2005.2.1
Twonew Rh(I)-catalyzed methods for the synthesis of chiral alpha-branched amines via addition of arylboronic acids to N-tert-butanesulfinyl and N-diphenylphosphinoyl imines have been developed. The syntheses are more functional group tolerant than alternative methods utilizing Grignard or organolithium reagents, and the imine activating groups used are easily removed. These methods are both high-yielding