Aziridine 2-carboxylate ester mediated asymmetric synthesis of α-alkyl β-amino acids
摘要:
The highly stereoselective ring opening of N-tosylaziridine 2-carboxylate esters with LiAlH4 followed by oxidation of the ensuing syn alcohols results in a highly efficient 4 step asymmetric synthesis of alpha-methyl beta-amino acids from N-sulfinylaziridine 2-carboxylate esters. (C) 1997 Elsevier Science Ltd.
Stereoselective Synthesis of β-Substituted β-Amino Sulfones and Sulfonamides via Addition of Sulfonyl Anions to Chiral <i>N</i>-Sulfinyl Imines
作者:Francisco Velázquez、Ashok Arasappan、Kevin Chen、Mousumi Sannigrahi、Srikanth Venkatraman、Andrew T. McPhail、Tze-Ming Chan、Neng-Yang Shih、F. George Njoroge
DOI:10.1021/ol053132b
日期:2006.2.1
[reaction: see text] A highly stereoselective synthesis of beta-amino sulfones and sulfonamides via addition of sulfonyl anions to chiral N-sulfinyl imines is described. The addition reaction proceeds in good yield (75-99%) and stereoselectivity.
Asymmetric Synthesis of <i>syn</i>-α-Substituted β-Amino Ketones by Using Sulfinimines and Prochiral Weinreb Amide Enolates
作者:Franklin A. Davis、Minsoo Song
DOI:10.1021/ol0708166
日期:2007.6.1
Syn-alpha-substituted beta-amino Weinrebamides are new chiral building blocks for asymmetricsynthesis of syn-alpha-substituted beta-amino acids, aldehydes, and ketones and are prepared by addition of prochiral lithium enolates of Weinrebamides to sulfinimines (N-sulfinyl imines).
Asymmetric Thio-Michael/Nucleophilic Addition Domino Reaction with Chiral <i>N</i>-Sulfinimines
作者:Akio Kamimura、Hidenori Okawa、Yuki Morisaki、Shingo Ishikawa、Hidemitsu Uno
DOI:10.1021/jo062251h
日期:2007.4.1
active N-sulfinimines underwent stereoselective Michael/nucleophilicaddition domino reaction triggered by magnesium thiolate to give α-phenylthiomethyl-β-(N-sulfinylamino) esters in high diastereomeric excess. The adducts were readily converted into optically active α-methylene-β-(N-sulfinylamino)esters so that this reaction provides a useful asymmetric aza-Baylis−Hillman-equivalent method.
Synthesis of Enantiopure Sulfinimines (Thiooxime <i>S</i>-Oxides) Catalyzed by Yb(OTf)<sub>3</sub> from <i>p</i>-Toluenesulfinamide and Aldehydes in Mild Reaction Conditions
作者:Zhi-Yong Jiang、W. H. Chan、A. W. M. Lee
DOI:10.1021/jo048597e
日期:2005.2.1
Enantiomerically pure sulfinimines as important building blocks in the asymmetric synthesis of amine derivatives are prepared in good to excellent yields from chiral p-toluenesulfinamide with aromatic, heteroaromatic, and aliphatic aldehydes. The unprecedented feature of the reported procedure is that the formation of the sulfinimines was achieved by the catalytic action of Yb(OTf)(3) in THF at room temperature. The reaction conditions were also applicable to Ellman's sulfinimines.