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Volumn 10, Issue 14, 2008, Pages 3073-3076

Further improvement on sulfonamide-based ligand for catalytic asymmetric 2-haloallylation and allylation

Author keywords

[No Author keywords available]

Indexed keywords

ALLYL COMPOUND; CHROMIUM; HALOGENATED HYDROCARBON; LIGAND; SULFONAMIDE;

EID: 52049109902     PISSN: 15237060     EISSN: None     Source Type: Journal    
DOI: 10.1021/ol801093p     Document Type: Article
Times cited : (43)

References (57)
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    • For Cr-mediated enantioselective allylation, see: (a) Cazes, B.; Vernière, C.; Goré, J. Synth. Commun. 1983, 13, 73.
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    • For reviews on metal-mediated enantioselective allylation, for example, see: a
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    • For the isolation of the halichondrins from a marine sponge Halichondria okadai Kadota, see: (a) Uemura, D.; Takahashi, K.; Yamamoto, T.; Katayama, C.; Tanaka, J.; Okumura, Y.; Hirata, Y J. Am. Chem. Soc. 1985, 107, 4796.
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    • (b) Yu, M. J.; Kishi, Y.; Littlefield, B. A. In Anticancer Agents from Natural Products, Eds. Cragg, G. M., Kingston, D. G. I., Newman, D. J., Eds.; CRC Press: Boca Raton, FL, 2005; pp 241-265.
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    • Littlefield, B. A.; Palme, M. H.; Seletsky, B. M.; Towle, M. J.; Yu, M. J.; Zheng, W. U.S. Patents 6214865 and 6365759 and International Patent WO99/65894.
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    • For the synthetic value of this functional group, for example, see Scheme 1 in: (a) Corey, E. J.; Yu, C-M.; Kim, S. S. J. Am. Chem. Soc. 1989, 111, 5495.
    • For the synthetic value of this functional group, for example, see Scheme 1 in: (a) Corey, E. J.; Yu, C-M.; Kim, S. S. J. Am. Chem. Soc. 1989, 111, 5495.
  • 44
    • 59949095352 scopus 로고    scopus 로고
    • This ligand was synthesized as depicted below. For the details, see the Supporting Information, Chemical Equation Presented
    • This ligand was synthesized as depicted below. For the details, see the Supporting Information. (Chemical Equation Presented)
  • 45
    • 59949085144 scopus 로고    scopus 로고
    • In addition to 2,6-dimethylbenzylsulfonamide B, 2-methylbenzyl, 2,4-dimethylbenzyl, and 2,5-dimethylbenzylsulfonamides were tested, but all of them existed as oils. Using the procedure shown in ref,10 we attempted to synthesize 2,4,6-trimethylbenzylsulfonyl chloride, but unsuccessfully
    • 10 we attempted to synthesize 2,4,6-trimethylbenzylsulfonyl chloride, but unsuccessfully.
  • 46
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    • The tested conditions included: complexation at rt for 45 min, 1.5 h, and 2.5 h; complexation at 42°C for 45 min, 1.5 h, and 2.5 h. We attempted to follow the complexation event by react IR spectroscopy, but the result was not conclusive. Therefore, we relied on the overall performance (asymmetric induction and yield) of 2-haloallylation to draw this conclusion. We should note that, with this optimized complexation protocol, the reproducibility of 2-haloallylation was also improved.
    • The tested conditions included: complexation at rt for 45 min, 1.5 h, and 2.5 h; complexation at 42°C for 45 min, 1.5 h, and 2.5 h. We attempted to follow the complexation event by react IR spectroscopy, but the result was not conclusive. Therefore, we relied on the overall performance (asymmetric induction and yield) of 2-haloallylation to draw this conclusion. We should note that, with this optimized complexation protocol, the reproducibility of 2-haloallylation was also improved.
  • 49
    • 59949097261 scopus 로고    scopus 로고
    • The catalyst loading was tested for the case of 2 + 4a → 7a; the following results were obtained: 10 mol % (yield = 85%, ee = 93%), 5 mol % (yield = 76%, ee = 92%), and 2.5 mol % (yield = 60%, ee = 91%).
    • The catalyst loading was tested for the case of 2 + 4a → 7a; the following results were obtained: 10 mol % (yield = 85%, ee = 93%), 5 mol % (yield = 76%, ee = 92%), and 2.5 mol % (yield = 60%, ee = 91%).
  • 50
    • 59949095209 scopus 로고    scopus 로고
    • The optical purity of 4b used was better than 99%.
    • The optical purity of 4b used was better than 99%.
  • 51
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    • 14
    • 14
  • 52
    • 59949091317 scopus 로고    scopus 로고
    • For the determination of absolute configuration, see Supporting Information of reference 1.
    • For the determination of absolute configuration, see Supporting Information of reference 1.
  • 53
    • 59949084802 scopus 로고    scopus 로고
    • In the catalytic system, Cr(III) is reduced to Cr(II) by Mn in situ
    • In the catalytic system, Cr(III) is reduced to Cr(II) by Mn in situ.
  • 54
    • 59949099691 scopus 로고    scopus 로고
    • 3·3THF.
    • 3·3THF.
  • 56
    • 59949094363 scopus 로고    scopus 로고
    • A 30-g scale 2-iodoallylation was carried out as below, Chemical Equation Presented A 2-L three-neck, round-bottomed flask equipped with a magnetic stir bar was charged with CoPc (0.18 g, 0.296 mmol, ent-B (7.68 g, 18.0 mmol, CrBr3 (Cerac, 5.08 g, 16.4 mmol, and Mn powder (Aldrich, 29.0 g, 523 mmol, The flask was capped with rubber septa. The inner atmosphere was replaced with N2 via gentle evacuation (oil pump) and purged with N2 three times. Anhydrous THF (Baker, ultra low water, no preservative, 700 mL) and then a THF solution of Et3N (2.73 mL, 19.2 mmol; THF: 30 mL) were cannulated into the flask. The reaction mixture was stirred at 42°C for 1.5 h with a slight positive pressure of N2 and then cooled to rt. A THF solution of 2,6-lutidine (2.50 mL, 20.9 mmol; THF: 30 mL) was cannulated into the reaction flask. The reaction mixture was stirred at rt for 15 min and cooled to 0°C. A THF solution of 2-i
    • 1H NMR analysis of its (+)-Mosher ester. Note: Large-scale 2-iodoallylation was carried out with the Pv- and TBDPS-protected aldehydes. The observed asymmetric induction was practically identical in the two series, but the yield in the TBDPS-series was 15-20% higher than that in the Pv series. In the TBDPS series, because of their similar polarity, the product and ligand B were separated after the alcohol was transformed into its 2,4,6-trimethylbenzenesulfonate. For the details, see the Supporting Information.
  • 57
    • 59949098894 scopus 로고    scopus 로고
    • This recovered ligand was shown to be as effective (asymmetric induction, yield, and reproducibility) as the original ligand
    • This recovered ligand was shown to be as effective (asymmetric induction, yield, and reproducibility) as the original ligand.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.