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Volumn , Issue 6, 2008, Pages 857-860

A novel chiral H′4-NOBIN schiff base for hetero-diels-alder reaction of danishefsky's diene with aldehydes

Author keywords

Asymmetric catalysis; Diels Alder reactions; Heterocycles; Schiff bases; Titanium

Indexed keywords

ALDEHYDE; ALKADIENE; DANISHEFSKY DIENE; SCHIFF BASE; UNCLASSIFIED DRUG;

EID: 42049091441     PISSN: 09365214     EISSN: None     Source Type: Journal    
DOI: 10.1055/s-2008-1042913     Document Type: Article
Times cited : (7)

References (36)
  • 18
    • 37549060019 scopus 로고    scopus 로고
    • Very recently, Motoyama reported hydrogenation of BINOL and BINAM using Ru/CNF-P as catalyst. See: Takasaki, M.; Motoyama, Y.; Yoon, S.-H.; Mochida, I.; Nagashima, H. J. Org. Chem. 2007, 72, 10291.
    • (b) Very recently, Motoyama reported hydrogenation of BINOL and BINAM using Ru/CNF-P as catalyst. See: Takasaki, M.; Motoyama, Y.; Yoon, S.-H.; Mochida, I.; Nagashima, H. J. Org. Chem. 2007, 72, 10291.
  • 30
    • 42049119435 scopus 로고    scopus 로고
    • Synthesis of (S)-5′,6′,7′,8′- tetrahydro-2-amino-2′-hydroxy-1,1′-binaphthyl (S, 5 (S)-NOBIN (0.57 g, 2 mmol, 5% Pd/C (0.21 g, and EtOH (15 mL) were placed into a 100 mL autoclave and stirred under 80 bar hydrogen pressure at 80°C for 10 h. The reaction mixture was cooled to r.t, the catalyst was filtered off, and washed with THF (2 x 10 mL, The combined filtrates were concentrated in vacuum to give a mixture of 3 and 5, which was submitted to column chromatographic separation on silica gel with hexane-EtOAc (9:1) as eluent to afford (S)-5 (382 mg, 66% yield) as a foam solid with >99.5% ee [HPLC on an AD-H column with hexane-i-PrOH (90:10) as eluent, 1 mL min-1, tR, 13.88 (R) min, tR, 22.73 min (S, mp 113-115°C; [α]D20 -59 (c 1, THF, 1H NMR 400
    • 19NO: C, 83.01; H, 6.62; N, 4.84. Found: C, 82.94; H, 6.68; N, 4.80.
  • 31
    • 42049119434 scopus 로고    scopus 로고
    • Synthesis of Ligand (S)-7 Compound (S)-5 (285 mg, 0.1 mmol) and salicylaldehyde (122 mg, 0.12 mmol) were stirred in toluene (20 mL) and the mixture was heated to reflux for 16 h. The solvent was removed in vacuo and the product was isolated by flash chromatography on silica gel (316 mg, 80.3% yield, mp 166-168°C, α]D20 -118 (c 0.2, THF, 1H NMR (400 MHz, CDCl3, δ, 1.54-1.58 (m, 2 H, 1.67-1.70 (m, 2 H, 1.99-2.10 (m, 1 H, 2.14-2.17 (m, 1 H, 2.76-2.81 (m, 2 H, 4.27 (s, 1 H, 6.84-6.89 (m, 3 H, 7.11-7.13 (m, 1 H, 7.27-7.32 (m, 3 H, 7.48-7.52 (m, 2 H, 7.59-7.61 (m, 1 H, 8.01-8.03 (m, 1 H, 8.51-8.53 (m, 1 H, 8.73 (s, 1 H, 12.3 (s, 1 H, 13C NMR 100 MHz, CDCl3, δ, 22.9, 23.0, 23.1, 27.4, 29.3, 112.7, 117.2, 117.4, 118.8, 119.3, 122.1, 125.7, 126.3, 127.2, 127.5, 128.2, 129.7, 130.2, 130.3, 132.3, 132.7, 132.9, 133.1, 136.4, 143.9, 150.6, 161.3
    • 2: C, 82.42; H, 5.89; N, 3.56. Found: C, 82.39; H, 5.88; N, 3.58.
  • 32
    • 42049119432 scopus 로고    scopus 로고
    • Crystallographic data (excluding structure factors) for the structures in this paper have been deposited with the Cambridge Crystallographic Data Centre as supplementary publication number CCDC 658558, R)-7, These data can be obtained free of charge via, or from the Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, UK; fax: +44(1223)336033 or e-mail: deposit@ccdc.cam.ac.uk
    • Crystallographic data (excluding structure factors) for the structures in this paper have been deposited with the Cambridge Crystallographic Data Centre as supplementary publication number CCDC 658558 [(R)-7]. These data can be obtained free of charge via www.ccdc.cam.ac.uk/conts/ retrieving.html [or from the Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, UK; fax: +44(1223)336033 or e-mail: deposit@ccdc.cam.ac.uk.].
  • 36
    • 42049121174 scopus 로고    scopus 로고
    • General Procedure for Catalytic Enantioselctive Hetero-Diels-Alder Reaction A mixture of (S)-Schiff Base (19.7 mg, 0.05 mmol, Ti(Oi-Pr)4 in toluene (0.25 M, 0.1 mL, 0.025 mmol) and activated powdered 4 Å MS (40 mg) in toluene (1 mL) was stirred for 2 h at 50°C. The red solution was cooled to r.t. and naproxen (5.8 mg, 0.025 mmol, aldehyde (0.25 mmol, and Danishefsky's diene (60 μL, 0.3 mmol) were added sequentially. The mixture was stirred for 12 h at r.t. before quenched with TFA (0.2 mL, After stirring for additional 30 min, the mixture was neutralized with sat. NaHCO3 (3 mL, After filtration through a plug of Celite, the organic layer was separated and the aqueous layer was extracted with EtOAc (3 x 5 mL, The combined organic layers were dried over anhyd Na 2SO4 and concentrated in vacuo. The residue was purified by flash chromatography (EtOAc-hexane, 1:4) to give the products for 1H NMR a
    • 1H NMR and HPLC analysis.


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