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Volumn , Issue 4, 2008, Pages 535-538

Diastereoselective tandem Diels-Alder macrocyclizations starting from sorbyl or sorboyl derivatives

Author keywords

1,2,4 triazoline 3,5 dione; Diastereoselectivity; Diels Alder; Macrocycles; Sorbyl and sorboyl derivatives

Indexed keywords

SORBOYL DERIVATIVE; SORBYL DERIVATIVE; THROMBIN INHIBITOR; TRIAZOLINE DERIVATIVE; UNCLASSIFIED DRUG;

EID: 41049103984     PISSN: 09365214     EISSN: None     Source Type: Journal    
DOI: 10.1055/s-2008-1032083     Document Type: Article
Times cited : (5)

References (36)
  • 33
    • 41049102352 scopus 로고    scopus 로고
    • Giesecke, H.; Merten, R.; Rottmaier, L. EP 44421, 1982; Chem. Abstr. 1982, 96, 1999701q.
    • Giesecke, H.; Merten, R.; Rottmaier, L. EP 44421, 1982; Chem. Abstr. 1982, 96, 1999701q.
  • 34
    • 41049094571 scopus 로고    scopus 로고
    • General Procedure for Macrocyclizations A flask is charged with CH2Cl2 (800-1400 ml) as a diluting agent. Dichloromethane often contains 2-methylbut-2-ene as a stabilizer which undergoes ene reaction when it is treated with TAD derivatives. Therefore, it must be removed before using larger amounts of CH2Cl2, e.g. by the addition of a few drops of bromine. Furthermore, the flask is equipped with two dropping funnels containing 15-50 mM solutions of bis-TAD 2 and bisdiene 1. Both solutions are simultaneously added dropwise at r.t. into the vigorously stirred solvent at such a rate that only a faint pink color can be observed (normally 3-5 h, After complete addition, the reaction mixture is concentrated in vacuo and chromatographed on silica gel to yield colorless solids. Spectroscopic Data of rac-3ac, rac-3ad, and meso-3ad rac-3ac both enantiomers, mp 1
    • 2), 18.2 (q, CHMe).
  • 36
    • 41049105984 scopus 로고    scopus 로고
    • A diluted solution of 1g (1 equiv) in CH2Cl2 was treated with 4-phenyl-1,2,4-triazoline-3,5-dione (0.8 equiv) in CH 2Cl2 at r.t. After evaporation of the solvent, NMR analysis of the crude product revealed only a mixture of 1g and the PTAD-sorbyl adduct, which was isolated by flash chromatography in 69% yield as a colorless solid, 5S,8S)-8-Methyl-1,3-dioxo-2-phenyl-2,3,5,8- tetrahydro-1H-[1,2,4]triazolo[1,2-a]pyridazin-5-yl]methyl (2E,4E)-hexa-2,4-dienoate (both enantiomers, mp (CH 2Cl2-acetone, 117°C IR (CDCl3, v, 1770 (w, 1712 (vs, C=O, 1426 (m, 1243 (m) cm-1. 1H NMR (400 MHz, CDCl3, CHCl3, 7.26 ppm, δ, 7.52 (m, 2 H, 3-PhCH, 7.46 (m, 2 H, 2-PhCH, 7.36 (tt, J, 7.2, 1.2 Hz, 1 H, 4-PhCH, 7.25 (dd, J, 15.2, 10.8 Hz, 1 H, CH, 6.04-6.20 (m, 2 H, CH, 5.92 ddd, J
    • 4: C, 65.38; H, 5.76; N, 11.44. Found: C, 65.18; H, 5.94; N, 11.41.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.