Synlett 2012; 23(14): 2083-2086 DOI: 10.1055/s-0031-1290441
© Georg Thieme Verlag Stuttgart · New York
Synthesis of Sugar-Derived 2-Nitroalkanols via Henry Reaction Promoted by Samarium Diiodide or Indium
Humberto Rodríguez-Solla*
a
Departamento Química Orgánica e Inorgánica, Universidad de Oviedo, C/ Julián Clavería 8, 33006 Oviedo, Spain, Fax: +34(985)102971 Email:
hrsolla@uniovi.es
,
Noemí Alvaredo
a
Departamento Química Orgánica e Inorgánica, Universidad de Oviedo, C/ Julián Clavería 8, 33006 Oviedo, Spain, Fax: +34(985)102971 Email:
hrsolla@uniovi.es
,
Raquel G. Soengas*
b
Department of Chemistry & QOPNA, University of Aveiro, 3810-193 Aveiro, Portugal, Email:
rsoengas@ua.pt
› Author Affiliations
Abstract
We present herein an improved synthesis of nitro sugars, consisting of a Henry-type reaction of bromonitromethane and sugar aldehydes. The reaction can be promoted by either SmI2 or indium metal, yielding in both cases high yields and good diastereoisomeric ratios. However, while the SmI2 -promoted reaction is very sensitive to steric factors and only gives satisfactory results with bromonitromethane, the indium-mediated reaction is not subjected to this limitation, giving excellent results with bromonitromethane as well as more hindered bromonitroalkanes.
Key words carbohydrates - Henry reaction - 2-nitroalkanols - samarium - indium
References
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6 Soengas RG, Estévez JC, Estevez AM, Fernández F, Estévez RJ. Carbohydr. Chem. 2009; 35: 1
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The Chemistry of the Nitro and Nitroso Groups
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12f Bulbule VJ, Deshpande VH, Velu S, Sudalai A, Sivasankar S, Sathe VT. Tetrahedron 1999; 55: 9325
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12h Ballini R, Fiorini D, Gil MV, Palmieri A. Tetrahedron 2004; 60: 2799
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14 Concellón JM, Rodríguez-Solla H, Concellón C. J. Org. Chem. 2006; 71: 7919
Reactions of bromonitromethane and aldehydes to give 2-bromo-2-nitroalkan-1-ols have also been described:
15a Concellón JM, Rodríguez-Solla H, Concellón C, García-Granda S, Díaz MR. Org. Lett. 2006; 8: 5979
15b Blay G, Hernández-Olmos V, Pedro JR. Chem. Commun. 2008; 4840
16 Soengas RG, Estévez AM. Eur. J. Org. Chem. 2010; 5190
17
Representative Analytical Data
3-O -Benzyl-6-deoxy-6-nitro-1,2-O -isopropyliden-α-d -glucofuranose (3a)
Yellow oil; [α]D
20 –26.8 (c 1.0 in CHCl3 ). 1 H NMR (300 MHz, CDCl3 ): δ = 7.49–7.30 (m, 5 H), 5.91 (d, J = 3.7 Hz, 1 H), 4.76–4.60 (m, 4 H), 4.56–4.42 (m, 2 H), 4.14–4.06 (m, 2 H), 2.58 (d, J = 4.9 Hz, 1 H), 1.47 (s, 3 H), 1.32 (s, 3 H) ppm. 13 C NMR (75 MHz, CDCl3 ): δ = 136.8 (C), 128.8 (2 × CH), 128.4 (CH), 127.9 (2 × CH), 112.1 (C), 105.1 (CH), 82.0 (CH), 80.9 (CH), 79.9 (CH), 78.5 (CH2 ), 72.1 (CH2 ), 66.3 (CH), 26.9 (CH3 ), 26.1 (CH3 ) ppm. MS (ESI+ ): m/z (%) = 362 (15) [M + Na]+ , 357 (100) [M + NH4 ]+ , 316 (1), 288 (8), 282 (1). HRMS (ESI+ ): m/z calcd for [C16 H21 NO7 Na]+ [M + Na]+ : 362.1216; found: 362.1210; Rf
= 0.33 (hexane–EtOAc = 3:1).
7-Deoxy-1,2:3,4-di-O -isopropylidene-7-nitro-d
- glycero-β-d -galacto-heptopyranose (3c)
Yellow oil; [α]D
20 –49.4 (c 0.6 in CHCl3 ). 1 H NMR (300 MHz, CDCl3 ): δ = 5.49 (d, J =5.0 Hz, 1 H), 4.78 (app d, J = 11.2 Hz, 1 H), 4.65 (dd, J = 8.0, 2.5 Hz, 1 H), 4.51–4.47 (m, 2 H), 4.43 (dd, J = 8.0, 2.0 Hz, 1 H), 4.34 (dd, J = 4.9, 2.5 Hz, 1 H), 3.73 (dd, J = 8.2, 2.0 Hz, 1 H), 2.89 (d, J = 5.9 Hz, 1 H), 1.51 (s, 3 H), 1.46 (s, 3 H), 1.37 (s, 3 H), 1.32 (s, 3 H) ppm. 13 C NMR (75 MHz, CDCl3 ): δ = 109.6 (C), 108.9 (C), 96.2 (CH), 78.1 (CH2 ), 70.6 (CH), 70.5 (CH), 70.1 (CH), 67.7 (CH), 67.4 (CH), 25.9 (2 × CH3 ), 24.8 (CH3 ), 24.3 (CH3 ) ppm. MS (ESI+ ): m/z (%) = 342 (24) [M + Na]+ , 337 (100) [M + NH4 ]+ , 320 (19) [M + H]+ , 262 (48). HRMS (ESI+ ): m/z calcd for [C13 H22 NO8 ]+ [M + H]+ : 320.1340; found: 320.1339. Rf
= 0.20 (hexane–EtOAc = 3:1).
18
General Procedure for the Samarium Diiodide Mediated Reaction of Bromonitromethane and Aldehydes
SmI2 (0.8 mmol, 0.1 M) in THF (8 mL) was added to a stirred solution of bromonitromethane (0.8 mmol) and the corresponding aldehyde (0.8 mmol) in THF (5 mL). After stirring the reaction mixture at r.t. for 5 h it was quenched with aq HCl (10 mL, 0.1 M) and extracted with CH2 Cl2 (3 × 25 mL). The combined extracts were washed with an aq sat. solution of Na2 S2 O3 (20 mL), then dried over MgSO4 , filtered, and the solvent was evaporated in vacuo. The residue was purified by flash column chromatography with mixtures of EtOAc–hexane.
19
General Procedure for the Indium-Mediated Reaction of Bromonitroalkanes and Aldehydes
To a suspension of indium powder (0.5 mmol) in THF (1 mL) was added the bromonitroalkane (0.6 mmol), and the mixture was sonicated for 20 min. The corresponding aldehyde (0.5 mmol) was added, and sonication was continued for a further 4 h. The reaction mixture was neutralized with sat. aq NaHCO3 , diluted with H2 O (10 mL), and extracted with Et2 O (3 × 25 mL). The combined organic layers were dried over MgSO4 , filtered, and the solvent was evaporated in vacuo. The residue was purified by flash column chromatography with mixtures of EtOAc–hexane.
Reviews on indium chemistry:
20a Cintas P. Synlett 1995; 1089
20b Li CJ. Tetrahedron 1996; 52: 5643
20c Marshall JA. Chemtracts – Org. Chem. 1997; 10: 481
20d Li CJ In
Green Chemistry: Frontiers in Benign Chemical Syntheses and Processes
. Anastas P, Williamson TC. Oxford University Press; New York: 1998. Chap. 14
20e Paquette LA.
Green Chemistry: Frontiers in Benign Chemical Syntheses and Processes
. Anastas P, Williamson TC. Oxford University Press; New York: 1998. Chap. 15
20f Li CJ, Chan TK. Tetrahedron 1999; 55: 11149
21
Representative Analytical Data 1-O -tert -Butyldimethylsilyl-2,3-di-O -isopropylidene-5(R )-(1-methyl-1-nitroethyl)-α-d -lyxofuranose (5c)
Yellow oil; [α]D
23 –21.3 (c 0.4 in CHCl3 ). 1 H NMR (300 MHz, CDCl3 ): δ = 5.09 (s, 1 H, 1-H), 4.84 (dd, 1 H, J = 3.8, 5.8 Hz), 4.53–4.63 (m, 2 H), 3.80–4.48 (m, 2 H), 2.85 (d, 1 H, J = 5.6 Hz, OH), 1.61 (s, 6 H, 2 × CH3 ), 1.31, 1.47 (2 × s, 6 H, 2 × CH3 ), 0.86 (s, 9 H, 3 × CH3 ), 0.10 (s, 3 H, CH3 ), 0.11 (s, 3 H, CH3 ) ppm. 13 C NMR (75 MHz, CDCl3 ): δ = 113.12 (C), 106.13 (CH), 91.1 (C), 84.3 (CH), 81.1 (CH), 79.3 (CH), 73.9 (CH), 69.6 (CH), 26.3 (CH3 ), 25.0 (CH3 ), 24.0 (CH3 ), 21.0 (CH3 ), 19.8 (C), 17.8 (3 × CH3 ), –4.5 (CH3 ), –5.5 (CH3 ) ppm. ESI-MS: m /z (%) = 488 (10) [M + H]+ . HRMS: m/z calcd for C26 H38 NO6 Si [M + H]+ : 488.2462; found: 488.2471. Rf
= 0.30 (hexane–EtOAc = 7:1).
4-O -tert -Butyldiphenylsilyl-2,3-di-O -isopropylidene-1(S )-(1-methyl-1-nitroethyl)-d -threitol (5e)
Yellow oil. 1 H NMR (300 MHz, CDCl3 ): δ = 7.66–7.73 (m, 4 H, 4 × HAr), 7.35–7.48 (m, 6 H, 6 × HAr), 4.10–4.23 (m, 2 H), 3.83–3.90 (m, 2 H), 3.66–3.74 (m, 1 H), 1.67, 1.69 (2 × s, 6 H, 2 × CH3 ) ppm. 13 C NMR (75 MHz, CDCl3 ): δ = 135.7 (C), 135.6 (C), 128.1 (CH), 128.0 (CH), 127.8 (CH), 127.7 (CH), 127.6 (CH), 110.2 (C), 91.3 (C), 81.0 (CH), 79.6 (CH), 76.3 (CH), 65.2 (CH2 ), 26.7 (CH3 ), 26.6 (CH3 ), 23.3 (CH3 ), 21.6 (CH3 ), 19.3 (CH3 ) ppm. ESI-MS: m /z (%) = 505 (100) [M + Na]+ : 488 (20) [M + H]+ . HRMS: m/z calcd for C26 H38 NO6 Si [M + H]+ : 488.2462; found: 488.2484. Rf
= 0.29 (hexane–EtOAc = 4:1).
22
Representative Analytical Data 3-O -Benzyl-5(R )-(2,2-dimethyl-5-nitro-1,3-dioxan-5-yl)-1,2-O -isopropylidene-α-d -xylofuranose (7a)
Yellow oil; [α]D
24 –39.7 (c 1.2 in CHCl3 ). 1 H NMR (300 MHz, CDCl3 ): δ = 7.36–7.24 (m, 5 H, 5 × HAr), 5.91 (d, 1 H, J
1,2 = 3.7 Hz, 1-H), 4.42–4.57 (m, 5 H), 4.05–4.34 (m, 5 H), 1.34, 1.39, 1.43, 1.45 (4 × s, 12 H, 4 × CH3 ) ppm. 13 C NMR (75 MHz, CDCl3 ): δ = 136.8 (C), 129.2 (2 × CH), 128.9 (CH), 128.3 (2 × CH), 112.6 (C), 105.6 (C), 99.5 (CH), 90.2 (C), 82.5 (CH), 81.3 (CH), 78.7 (CH2 ), 72.4 (CH), 70.4 (CH), 62.8 (CH2 ), 61.1 (CH2 ), 26.5 (CH3 ), 25.6 (CH3 ), 21.5 (CH3 ), 20.6 (CH3 ) ppm. ESI-MS: m /z (%) = 440 (21) [M + H]+ , 462 (100) [M + Na]+ . HRMS: m/z calcd for C21 H30 NO9 [M + H]+ : 440.1915; found: 440.1894. Rf
= 0.31 (hexane–EtOAc = 3:1).
1,2:3,4-Di-O -isopropylidene-6(R )-(2,2-dimethyl-5-nitro-1,3-dioxan-5-yl)-β-d -galacto-heptopyranose (7b)
Colorless oil; [α]D
25 +33.4 (c 0.9 in CHCl3 ). 1 H NMR (300 MHz, CDCl3 ): δ = 5.50 (d, 1 H, J = 5.1 Hz, H-1), 4.52–4.71 (m, 3 H), 4.03–4.37 (m, 5 H), 3.92 (dd, 1 H, J = 8.9, 1.9 Hz,), 3.16 (d, 1 H, J = 7.1 Hz, OH), 1.33, 1.35, 1.36, 1.45, 1.46, 1.59 (6 × s, 18 H) ppm. 13 C NMR (75 MHz, CDCl3 ): δ = 109.6 (C), 109.1 (C), 98.9 (C), 96.1 (CH), 89.9 (C), 70.8 (CH), 70.6 (CH), 70.5 (CH), 70.0 (CH), 66.6 (CH), 62.7 (CH2 ), 61.1 (CH2 ), 27.3 (CH3 ), 25.8 (CH3 ), 25.6 (CH3 ), 24.3 (CH3 ), 19.5 (CH3 ) ppm. ESI-MS: m /z (%) = 420 (31) [M + H]+ , 442 (9) [M + Na]+ . HRMS: m/z calcd for C18 H30 NO10 [M + H]+ : 420.1870; found: 420.1863. Rf
= 0.31 (hexane–EtOAc = 2:1).