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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
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2), 18.2 (q, CHMe).
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36
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41049105984
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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
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4: C, 65.38; H, 5.76; N, 11.44. Found: C, 65.18; H, 5.94; N, 11.41.
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