Chemo-enzymatic synthesis of the azasugars 1,4-dideoxyallonojirimycin and 1,4-dideoxymannojirimycin
摘要:
The enzymatic resolution of the N-phenylacetyl derivative of racemic homoserine lactone with penicillin G acylase immobilized on Eupergit C gave (R)-(+)-alpha-amino-gamma-butyrolactone and (S)-(-)-alpha-N-phenylacetamido-gamma-butyrolactone in high enantiomeric purity (ee >99%) and 46-47% yields for each enantiomer. The enantiomers were converted into azasugars 1,4-dideoxyallonojirimycin and 1,4-dideoxymannojirimycin using Wittig olefination, catalytic ring-closing metathesis (RCM), and stereoselective dihydroxylation with OsO4 in 29% overall yield over 11 high yielding steps. Enzyme inhibition studies showed that 1,4-dideoxyallonojirimycin is a better beta-glucosidase inhibitor (IC50 32.4 mu M toward beta-glucosidase from almonds) and a better beta-galactosidase inhibitor (IC50 5.9 mM for beta-galactosidase from Aspergillus oryzae) than 1,4-dideoxymannojirimycin (IC50 2.86 mM and 12.5 mM for beta-glucosidase and beta-galactosidase, respectively). (C) 2011 Elsevier Ltd. All rights reserved.
Herein we report the firsttotalsynthesis of alkaloid caulophyllumine B in 14 steps by an iterative olefincross-metathesis strategy from l-glutamic acid.
在本文中,我们报道了由I-谷氨酸通过迭代烯烃交叉复分解策略在14个步骤中首次合成生物碱花青素B。
Unified Approach to the Asymmetric Synthesis of Higher Homologues of (3-Quinolyl)-alanine
作者:Shital K. Chattopadhyay、Indranil Kundu
DOI:10.1080/00397911.2014.882002
日期:2014.7.18
A new protocol based on a palladium-catalyzed Heck reaction of an amino acid-derived vinyl unit with 3-bromoquinoline has been developed to access the title compounds in good yield and optical purity.
Chemo-enzymatic synthesis of the azasugars 1,4-dideoxyallonojirimycin and 1,4-dideoxymannojirimycin
作者:Mallam Venkataiah、Gowrisankar Reddipalli、Lakshmi Swarnalatha Jasti、Nitin W. Fadnavis
DOI:10.1016/j.tetasy.2011.10.015
日期:2011.11
The enzymatic resolution of the N-phenylacetyl derivative of racemic homoserine lactone with penicillin G acylase immobilized on Eupergit C gave (R)-(+)-alpha-amino-gamma-butyrolactone and (S)-(-)-alpha-N-phenylacetamido-gamma-butyrolactone in high enantiomeric purity (ee >99%) and 46-47% yields for each enantiomer. The enantiomers were converted into azasugars 1,4-dideoxyallonojirimycin and 1,4-dideoxymannojirimycin using Wittig olefination, catalytic ring-closing metathesis (RCM), and stereoselective dihydroxylation with OsO4 in 29% overall yield over 11 high yielding steps. Enzyme inhibition studies showed that 1,4-dideoxyallonojirimycin is a better beta-glucosidase inhibitor (IC50 32.4 mu M toward beta-glucosidase from almonds) and a better beta-galactosidase inhibitor (IC50 5.9 mM for beta-galactosidase from Aspergillus oryzae) than 1,4-dideoxymannojirimycin (IC50 2.86 mM and 12.5 mM for beta-glucosidase and beta-galactosidase, respectively). (C) 2011 Elsevier Ltd. All rights reserved.
Cross-Metathesis of <i>C</i>-Allyl Iminosugars with Alkenyl Oxazolidines as a Key Step in the Synthesis of <i>C</i>-Iminoglycosyl α-Amino Acids.<sup>1</sup> A Route to Iminosugar Containing <i>C</i>-Glycopeptides
作者:Alessandro Dondoni、Pier Paolo Giovannini、Daniela Perrone
DOI:10.1021/jo050494o
日期:2005.7.1
oxazolidine ring by the Jones reagent. All amino acids were characterized as their methyl esters. The insertion of a model C-iminoglycosyl-2-aminopentanoic acid into a tripeptide via sequential carboxylic and amino group coupling with l-phenylalanine derivatives was carried out as a demonstration of the potential of these sugar amino acids in designed glycopeptide synthesis.