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Volumn , Issue 11, 2008, Pages 1737-1741

Total synthesis of amphidinolide X and its 12Z-isomer by formation of the C12-C13 trisubstituted double bond via ring-closing metathesis

Author keywords

Anti selective aldehyde crotylation; Macrodiolide; Microwave; Ring closing metathesis; Trisubstituted olefin

Indexed keywords

AMPHIDINOLIDE A; CARBON; CARBON 13; RUTHENIUM;

EID: 48449090382     PISSN: 09365214     EISSN: None     Source Type: Journal    
DOI: 10.1055/s-2008-1077885     Document Type: Article
Times cited : (29)

References (73)
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    • See also: Handbook of Metathesis, 1-3; Grubbs, R. H., Ed.; Wiley-VCH: Weinheim, 2003.
    • (k) See also: Handbook of Metathesis, Vol. 1-3; Grubbs, R. H., Ed.; Wiley-VCH: Weinheim, 2003.
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    • For the second total synthesis of amphidinolide Y, see
    • For the second total synthesis of amphidinolide Y, see: Jin, J.; Chen, Y.; Li, Y.; Wu, J.; Dai, W.-M. Org. Lett. 2007, 9, 2585.
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    • (n) For Mo-mediated RCM to macrocyclic trisubstituted Z-alkenes or E/Z mixtures, see: Xu, Z.; Johannes, C. W.; Houri, A. F.; La, D. S.; Cogan, D. A.; Hofilena, G. E.; Hoveyda, A. H. J. Am. Chem. Soc. 1997, 119, 10302; and references cited therein.
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    • We used noncrystallized form of the reagent. An 85:15 mixture of (S,S)-9 and its Z-isomer was prepared from an 85:15 mixture of E- and Z-crotyl chloride obtained from Aldrich according to the literature procedure (ref. 11, The Z-isomer of (S,S)-9 reacted with (R)-8 to produce a syn-homoallyl alcohol which is different from 3′. The diastereomeric ratio of >99:1 was estimated according to the 1H NMR spectrum of the product mixture
    • 1H NMR spectrum of the product mixture.
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    • Procedure for Synthesis of (12Z)-Amphidinolide X via Ring-Closing Metathesis of the seco Ketone 19 Using Second-Generation Grubbs Initiator 23 To a degassed, refluxing solution of the seco ketone 19 (30.0 mg, 6.310-2 mmol) in anhyd CH 2Cl2 (100 mL) under a nitrogen atmosphere was added the second-generation Grubbs initiator 23 (2.7 mg, 0.3-10-2 mmol, The resulting clear, pale pink solution changed to a clear yellow color after refluxing for 24 h. Three additional portions of 23 (2.7 mg, 0.3 · 10-2 mmol; a total of 1.2 · 10-2 mmol) were added after 24, 48, and 72 h, respectively. After refluxing for a total of 4 d, the reaction mixture was concentrated to <1 mL on a rotary evaporator, and the remaining mixture was purified directly by flash column chromatography over SiO2 [eluting with 3% EtOAc in PE (bp 60-90 °C, to give (12Z)-amphi
    • -2 mmol) were added after 24, 48, and 72 h, respectively. After refluxing for a total of 4 d, the reaction mixture was concentrated to <1 mL on a rotary evaporator
  • 57
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    • Procedure for the Synthesis of Amphidinolide X via Ring-Closing Metathesis of 17 Using Second-Generation Grubbs Initiator 23 as the Key Step To a degassed, refluxing solution of 17 (150.0 mg, 0.21 mmol) in anhyd CH2Cl2 (150 mL) under a nitrogen atmosphere was added the second-generation Grubbs initiator 23 (8.9 mg, 1.1-10-2 mmol, The resulting clear, pale pink solution changed to a clear yellow color after refluxing for 24 h. Three additional portions of 23 (8.9 mg, 1.1.M0 -2 mmol; a total of 4.4.10-2 mmol) were added after 24,48, and 72 h, respectively. After refluxing for a total of 6 d, the reaction mixture was concentrated to >1 mL on a rotary evaporator and the remaining mixture was purified directly by flash column chromatography over SiO 2 [eluting with 3% EtOAc in PE (bp 60-90 °C, to give a 71:29 mixture of the Z and E RCM products 20 and 21 70.0 m
    • 3): δ = 7.12 (dd, J = 15.8, 7.2 Hz, 1 H), 5.79 (dd, J = 15.8, 1.6 Hz, 1 H), 5.20 (m, 2 H), 4.95 (d, J = 10.3 Hz, 1 H), 3.96 (dt, J = 11.2, 3.6 Hz, 1 H), 2.78 (m, 1 H), 2.69 (dd, J = 16.6,6.1 Hz, 1 H), 2.69 (m, 1 H), 2.58 (dd, J = 13.6,3.9 Hz, 1 H), 2.58 (dd, J = 16.5, 7.5 Hz, 1 H), 2.41 (dd, J = 13.3, 6.3 Hz, 1 H), 2.18 (m, 1 H), 2.17 (m, 1 H), 2.14 (s, 3 H), 2.12 (m, 1 H), 1.94 (tt, J = 13.5, 3.3 Hz, 1 H), 1.75 (dd, J = 13.9, 2.4 Hz, 1 H), 1.55 (s, 3 H), 1.54 (m, 1 H), 1.50 (m, 2 H)
  • 58
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    • Remote control of alkene geometry by endocyclic groups in ring-closing metathesis has been reported. For examples of formation of disubstituted macrocyclic alkenes, see: (a) Meng, D, Su, D.-S, Balog, A, Bertinato, P, Sorensen, E. J, Danishefsky, S. J, Zheng, Y.-H, Chou, T.-C, He, L, Horwitz, S. B. J. Am. Chem. Soc. 1997, 119, 2733
    • Remote control of alkene geometry by endocyclic groups in ring-closing metathesis has been reported. For examples of formation of disubstituted macrocyclic alkenes, see: (a) Meng, D.; Su, D.-S.; Balog, A.; Bertinato, P.; Sorensen, E. J.; Danishefsky, S. J.; Zheng, Y.-H.; Chou, T.-C.; He, L.; Horwitz, S. B. J. Am. Chem. Soc. 1997, 119, 2733.
  • 66
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    • For examples of formation of trisubstituted macrocyclic alkenes, see: Meng, D, Bertinato, P, Balog, A, Su, D.-S, Kamenecka, T, Sorensen, E. J, Danishefsky, S. J. J. Am. Chem. Soc. 1997, 119, 10073
    • (i) For examples of formation of trisubstituted macrocyclic alkenes, see: Meng, D.; Bertinato, P.; Balog, A.; Su, D.-S.; Kamenecka, T.; Sorensen, E. J.; Danishefsky, S. J. J. Am. Chem. Soc. 1997, 119, 10073.
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    • see also ref. 7
    • see also ref. 7.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.