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Volumn , Issue 17, 2007, Pages 2659-2662

New chiral hydroxyoxazolines based on ketopinic acid and their use in the asymmetric Diels-Alder reaction

Author keywords

Alkenes; Asymmetric catalysis; Copper; Diels Alder reactions; Ligands

Indexed keywords

ACID; AMINOALCOHOL; COPPER; HYDROXYOXAZOLINE; KETOPINIC ACID; OXAZOLINE DERIVATIVE; UNCLASSIFIED DRUG;

EID: 35748944147     PISSN: 09365214     EISSN: None     Source Type: Journal    
DOI: 10.1055/s-2007-991052     Document Type: Article
Times cited : (6)

References (38)
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    • Experimental Procedure for the Synthesis of Compound 2d: A solution of (S, )-ketopinic acid (1, 1.0 g, 5.5 mmol) in SOCl2 (4.5 mL) was refluxed for 2 h and the excess SOCl2 was removed under reduced pressure. The residue dissolved in CH 2Cl2 (3.8 mL) was added dropwise to a solution of (1R,2S)-1-amino-2,3-dihydro-1H-inden-2-ol (3d, 0.82 g, 5.5 mmol) and Et3N (0.75 mL, 5.5 mmol) in CH2Cl 2 (3 mL) at 0°C under nitrogen. After 1 h, the mixture was diluted with EtOAc (150 mL, washed with 2 M HCl (2 x 30 mL, sat. aq NaHCO 3 (2 x 30 mL) and brine (30 mL, dried over MgSO4 and concentrated. The crude product was crystallized from hexane-CH 2Cl2 to give 4d; yield: 2.0 g (80, mp 163-165°C; [α]D25 +28.5 (c, 0.69, CHCl3, 1H NMR 300 MHz, CDCl3
    • 2 to give 4d; yield: 2.0 g (80%);(...)


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