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9 article(s) from Misra, Anup Kumar

Convenient synthesis of the pentasaccharide repeating unit corresponding to the cell wall O-antigen of Escherichia albertii O4

Tapasi Manna,
Arin Gucchait and
Anup Kumar Misra

Full Research Paper
Published 22 Jan 2020

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1. Graphical Abstract
2. Figure 1: Structure of the pentasaccharide repeating unit corresponding to the cell wall O-antigen of Escheri...
  
  Jump to Figure 1
3. Scheme 1: (a) NIS, HClO₄/SiO₂, MS 4 Å, CH₂Cl₂, −45 °C, 1 h, 79%; (b) 0.1 M CH₃ONa, CH₃OH, room temperature, 2...
  
  Jump to Scheme 1
4. Scheme 2: (a) HClO₄/SiO₂, CH₂Cl₂, −10 °C, 1 h, 76%.
  
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5. Scheme 3: (a) NIS, HClO₄/SiO₂, MS 4 Å, CH₂Cl₂, −40 °C, 1 h, 22%.
  
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6. Scheme 4: (a) NIS, HClO₄/SiO₂, MS 4 Å, CH₂Cl₂, −45 °C, 1 h, 74%; (b) BnBr, NaOH, TBAB, THF, room temperature,...
  
  Jump to Scheme 4
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Beilstein J. Org. Chem. 2020, 16, 106–110, doi:10.3762/bjoc.16.12

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Convergent synthesis of the pentasaccharide repeating unit of the biofilms produced by Klebsiella pneumoniae

Arin Gucchait,
Angana Ghosh and
Anup Kumar Misra

Full Research Paper
Published 13 Feb 2019

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1. Graphical Abstract
2. Figure 1: Structure of the synthesized pentasaccharide corresponding to the repeating unit of the biofilms pr...
  
  Jump to Figure 1
3. Scheme 1: Reagents and conditions: (a) i: Bu₂SnO, CH₃OH, 80 °C, 2 h; ii: allyl bromide, CsF, DMF, 65 °C, 6 h;...
  
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4. Scheme 2: Reagents and conditions: (a) Benzoyl chloride, pyridine, 0 °C, 3 h, 75%; (b) Tf₂O, BSP, TTBP, CH₂Cl₂...
  
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5. Scheme 3: Reagents and conditions: (a) TMSOTf, CH₂Cl₂, −10 °C, 30 min, 45%; (b) NIS, TMSOTf, MS 4 Å, CH₂Cl₂, ...
  
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6. Scheme 4: Reagents and conditions: (a) NIS, TMSOTf, MS 4 Å, CH₂Cl₂, −50 °C, 2 h, 70%; (b) benzyl bromide, NaO...
  
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Beilstein J. Org. Chem. 2019, 15, 431–436, doi:10.3762/bjoc.15.37

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Convergent synthesis of a tetrasaccharide repeating unit of the O-specific polysaccharide from the cell wall lipopolysaccharide of Azospirillum brasilense strain Sp7

Pintu Kumar Mandal,
Debashis Dhara and
Anup Kumar Misra

Full Research Paper
Published 29 Jan 2014

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1. Graphical Abstract
2. Figure 1: Structure of the synthesized tetrasaccharide and its precursor intermediates. PMB: p-methoxybenzyl.
  
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3. Scheme 1: Reagents and conditions: (a) 2,2-dimethoxypropane, p-TsOH, DMF, room temperature, 12 h; (b) acetic ...
  
  Jump to Scheme 1
4. Scheme 2: Reagents: (a) N-iodosuccinimide (NIS), TfOH, CH₂Cl₂, MS 4 Å, −30 °C, 1 h, then 0 °C, 1 h, 77%; (b) ...
  
  Jump to Scheme 2
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Beilstein J. Org. Chem. 2014, 10, 293–299, doi:10.3762/bjoc.10.26

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Straightforward synthesis of a tetrasaccharide repeating unit corresponding to the O-antigen of Escherichia coli O16

Manas Jana and
Anup Kumar Misra

Full Research Paper
Published 28 Aug 2013

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1. Graphical Abstract
2. Figure 1: Structure of the tetrasaccharide repeating unit of the O-antigen of Escherichia coli O16.
  
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3. Figure 2: Structure of the synthesized pentasaccharide and its synthetic intermediates.
  
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4. Scheme 1: Reagents: (a) N-iodosuccinimide (NIS), TfOH, CH₂Cl₂, MS 4 Å, −30 °C, 1 h, then 0 °C, 1 h, 76%; (b) ...
  
  Jump to Scheme 1
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Beilstein J. Org. Chem. 2013, 9, 1757–1762, doi:10.3762/bjoc.9.203

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Appel-reagent-mediated transformation of glycosyl hemiacetal derivatives into thioglycosides and glycosyl thiols

Tamashree Ghosh,
Abhishek Santra and
Anup Kumar Misra

Full Research Paper
Published 22 May 2013

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1. Graphical Abstract
2. Scheme 1: Appel-reagent-mediated transformation of glycosyl hemiacetal derivatives into thioglycosides and β-...
  
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3. Scheme 2: Plausible mechanistic pathways for the formation of 1,2-trans-thioglycoside and β-glycosyl thiol.
  
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Beilstein J. Org. Chem. 2013, 9, 974–982, doi:10.3762/bjoc.9.112

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Short synthesis of the common trisaccharide core of kankanose and kankanoside isolated from Cistanche tubulosa

Goutam Guchhait and
Anup Kumar Misra

Letter
Published 11 Apr 2013

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1. Graphical Abstract
2. Figure 1: Structure of the synthesized trisaccharide core found in kankanose, kankanoside F, H₁, H₂ and I iso...
  
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3. Scheme 1: Reagents: (a) 0.1 M CH₃ONa, CH₃OH, room temperature, 3 h, 98% for compound 5, 94% for compound 1; (...
  
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Beilstein J. Org. Chem. 2013, 9, 705–709, doi:10.3762/bjoc.9.80

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Removal of benzylidene acetal and benzyl ether in carbohydrate derivatives using triethylsilane and Pd/C

Abhishek Santra,
Tamashree Ghosh and
Anup Kumar Misra

Full Research Paper
Published 14 Jan 2013

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1. Graphical Abstract
2. Scheme 1: Removal of benzylidene acetal and benzyl ether by using a combination of triethylsilane and 10% Pd/...
  
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Beilstein J. Org. Chem. 2013, 9, 74–78, doi:10.3762/bjoc.9.9

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Convergent synthesis of the tetrasaccharide repeating unit of the cell wall lipopolysaccharide of Escherichia coli O40

Abhijit Sau and
Anup Kumar Misra

Full Research Paper
Published 22 Nov 2012

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1. Graphical Abstract
2. Figure 1: Structure of the tetrasaccharide repeating unit of the cell-wall lipopolysaccharide of Escherichia ...
  
  Jump to Figure 1
3. Figure 2: Structure of the synthesized tetrasaccharide 1 and its synthetic precursors.
  
  Jump to Figure 2
4. Scheme 1: Synthesis of disaccharide derivative 8. Reagents and conditions: (a) benzyl bromide, NaOH, DMF, roo...
  
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5. Scheme 2: Synthesis of disaccharide derivative 9. Reagents and conditions: (a) NIS, HClO₄–SiO₂, MS 4Å, CH₂Cl₂...
  
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6. Scheme 3: Synthesis of target tetrasaccharide 1. Reagents and conditions: (a) NIS, HClO₄–SiO₂, CH₂Cl₂, −15 °C...
  
  Jump to Scheme 3
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Beilstein J. Org. Chem. 2012, 8, 2053–2059, doi:10.3762/bjoc.8.230

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Convergent synthesis of the tetrasaccharide repeating unit of the O-antigen of Shigella boydii type 9

Abhishek Santra and
Anup Kumar Misra

Full Research Paper
Published 29 Aug 2011

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1. Graphical Abstract
2. Figure 1: Structure of the tetrasaccharide repeating unit of the O-antigen of Shigella boydii type 9.
  
  Jump to Figure 1
3. Figure 2: Structure of the synthesized tetrasaccharide and its intermediates.
  
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4. Scheme 1: Reagents: (a) acetic anhydride, sulfamic acid, 60 °C, 30 min, 91%; (b) Et₃SiH, I₂, 0–5 °C, 30 min, ...
  
  Jump to Scheme 1
5. Scheme 2: Reagents: (a) HClO₄–SiO₂, CH₂Cl₂, −15 °C, 1 h, 81%; (b) benzyl bromide, NaOH, n-Bu₄NBr, THF, rt, 2 ...
  
  Jump to Scheme 2
6. Scheme 3: Reagents: (a) N-iodosuccinimide, HClO₄–SiO₂, −10 °C, 1 h, 82%; (b) 0.1 M CH₃ONa, CH₃OH, rt, 3 h; (c...
  
  Jump to Scheme 3
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Beilstein J. Org. Chem. 2011, 7, 1182–1188, doi:10.3762/bjoc.7.137

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