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DOI: 10.1055/s-2006-956481
Hetero-Diels-Alder Reaction of 3-Bromo-7-(bromomethyl)tetracyclo[5.3.1.02,6.04,8]undec-10(12)-ene-9,11-dione with Pentafulvenes: Facile Synthesis of Novel Polycyclic Cage Compounds Having a Pyran Ring
Publikationsverlauf
Publikationsdatum:
08. Dezember 2006 (online)
Abstract
The enone moiety of 3-bromo-7-(bromomethyl)tetracyclo[5.3.1.02,6.04,8]undec-10(12)-ene-9,11-dione undergoes facile hetero-Diels-Alder reaction with pentafulvenes leading to novel cage systems with pyran moiety
Key words
polycyclic cage system - hetero-Diels-Alder reaction - pentafulvenes - pyran moiety
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References and Notes
Crystal Data for Compound 6a: C27H24Br2O2, colorless plates, 0.20 × 0.10 × 0.05 mm3; formula weight = 540.28; monoclinic, space group: P21/c; unit cell dimensions: a = 12.4363(16) Å, b = 14.1854(18) Å, c = 12.8075(16) Å, β = 91.000(2)°; V = 2259.1 (5) Å3; Z = 4; D(calcd) = 1.589 Mg/m3; F(000) = 1088; absorption coefficient = 3.610 mm-1; GoF = 0.992; R indices(I >2σ): R1 = 0.0565, wR2 = 0.1345. Crystal structure data for 6a have been deposited at the Cambridge Crystallographic Data Centre and the allocated deposition number is CCDC 602750.
16
Spectroscopic Data for Selected Compounds. Data for 6a: crystallized from CH2Cl2-hexane (1:5) mixture; mp 135-137 °C. Yield: 65%. FT-IR (KBr): 2974, 1751, 1665, 1243, 1228, 1176, 1070, 893, 692 cm-1. 1H NMR (300 MHz, CDCl3): δ = 7.22-7.46 (m, 5 H), 6.83-6.93 (m, 1 H), 6.57 (d, J = 15.3 Hz, 1 H), 6.26 (d, J = 5.7 Hz, 1 H), 6.15 (d, J = 11.4 Hz, 1 H), 6.02 (d, J = 5.4 Hz, 1 H), 5.29 (d, J = 5.7 Hz, 1 H), 4.29 (s, 1 H), 3.61 (d, J = 10.2 Hz, 1 H), 3.37-3.44 (q, J = 15.3 Hz, 1 H), 3.29 (d, J = 10.2 Hz, 1 H), 2.99-3.04 (t, J
1 = 6.3 Hz, J
2 = 7.5 Hz, 1 H), 2.84 (d, J = 4.5 Hz, 1 H), 2.63-2.74 (m, 3 H), 2.38-2.49 (m, 2 H), 2.02-2.10 (m, 1 H), 1.85 (d, J = 11.1 Hz, 1 H). 13C NMR (75 MHz, CDCl3): δ = 203.2, 149.8, 148.8, 137.5, 135.5, 132.7, 129.7, 128.9, 128.7, 127.6, 126.3, 125.2, 121.5, 103.5, 81.8, 55.5, 55.4, 54.1, 49.9, 45.8, 45.6, 45.0, 36.7, 35.4, 31.6, 28.2, 22.6. HRMS (EI): m/z [M+] calcd for C27H24O2Br2: 538.0143; found: 538.0132.
Data for 6b: crystallized from CH2Cl2-hexane (1:5) mixture; mp 124-126 °C. Yield: 61%. FT-IR (KBr): 2969, 1746, 1670, 1233, 1008, 974, 677, 653 cm-1. 1H NMR (300 MHz, CDCl3): δ = 7.46 (s, 1 H), 6.43 (s, 1 H), 6.25-6.27 (t, J
1 = 3.3 Hz, J
2 = 2.4 Hz, 2 H), 6.12 (s, 1 H), 5.99 (d, J = 3.6 Hz, 1 H), 5.30 (d, J = 6.9 Hz, 1 H), 4.29 (s, 1 H), 3.67-3.74 (dd, J = 6.9 Hz, 1 H), 3.62 (d, J = 10.2 Hz, 1 H), 3.27 (d, J = 10.2 Hz, 1 H), 2.98-3.02 (t, J
1 = 6.6 Hz, J
2 = 6.0 Hz, 1 H), 2.82 (d, J = 4.5 Hz, 1 H), 2.61-2.70 (m, 3 H), 2.56 (d, J = 8.4 Hz, 1 H), 2.34 (d, J = 4.5 Hz, 1 H), 1.93-2.01 (dd, J
1 = J
2 = 6.6 Hz, 1 H), 1.84 (d, J = 11.4 Hz, 1 H). 13C NMR (75 MHz, CDCl3): δ = 203.2, 152.6, 148.3, 146.9, 142.1, 137.2, 135.9, 111.6, 109.5, 109.1, 82.3, 55.6, 53.9, 49.9, 45.9, 45.6, 45.0, 37.9, 35.4, 31.6, 27.4, 22.6, 14.I. HRMS: m/z [M+] calcd for C23H20O3Br2: 501.9779; found: 501.9768.
Data for 6f: crystallized from CH2Cl2-hexane (1:5) mixture; mp 146-148 °C. Yield: 64%. FT-IR (KBr): 3434, 1756, 1665, 1226, 1243, 869, 658 cm-1. 1H NMR (300 MHz, CDCl3): δ = 8.62 (d, J = 4.5 Hz, 1 H), 7.63-7.58 (t, J
1 = 6.0 Hz, J
2 = 7.5 Hz, 1 H), 7.15 (d, J = 7.8 Hz, 1 H) 7.05-7.09 (t, J
1 = 4.8 Hz, J
2 = 7.2 Hz, 1 H), 6.30-6.35 (m, 2 H), 6.15 (d, J = 5.4 Hz, 1 H), 5.30 (d, J = 6.3 Hz, 1 H), 4.32 (s, 1 H), 4.20-4.28 (m, 1 H), 3.62 (d, J = 10.5 Hz, 1 H), 3.28 (d, J = 10.2 Hz, 1 H), 2.97-3.01 (t, J
1 = 7.2 Hz, J
2 = 6.3 Hz, 1 H), 2.82 (d, J = 4.5 Hz, 1 H), 2.61-2.76 (m, 4 H), 2.34 (d, J = 5.1 Hz, 1 H), 1.82-1.93 (m, 2 H). 13C NMR (75 MHz, CDCl3): δ = 203.3, 156.0, 153.7, 149.4, 148.0, 139.3, 136.6, 136.1, 124.3, 120.5, 120.1, 104.5, 82.4, 55.7, 55.4, 53.9, 49.9, 46.3, 45.9, 45.0, 37.9, 35.4, 31.6, 27.8. HRMS: m/z [M+] calcd for C24H21NO2Br2: 512.9939; found: 512.9943.
Data for 6g: crystallized from CH2Cl2-hexane (1:5) mixture; mp 154-156 °C. Yield: 54%. FT-IR (KBr): 2983, 1737, 1670, 1636, 1230, 740, 668 cm-1. 1H NMR (300 MHz, CDCl3): δ = 8.21 (s, 1 H), 7.63 (s, 1 H), 7.38 (d, J = 8.4 Hz, 1 H) 7.21-7.26 (m, 2 H), 6.57 (s, 1 H), 6.48 (s, 1 H), 6.34 (d, J = 5.7 Hz, 1 H), 5.95 (d, J = 5.4 Hz, 1 H), 5.34 (d, J = 6.9 Hz, 1 H), 4.23 (s, 1 H), 3.72-3.79 (m, 1 H), 3.61 (d, J = 10.2 Hz, 1 H), 3.27 (d, J = 10.2 Hz, 1 H), 2.92-2.96 (d, J
1 = 6.9 Hz, J
2 = 6.6 Hz, 1 H), 2.79 (d, J = 4.5 Hz, 1 H), 2.59-2.65 (m, 3 H), 2.42-2.51 (m, 1 H), 2.33 (s, 1 H), 1.99-2.01 (m, 1 H), 1.82 (d, J = 11.4 Hz, 1 H). 13C NMR (75 MHz, CDCl3): δ = 207.4, 148.5, 146.5, 138.3, 137.1, 134.3, 133.9, 124.6, 123.3, 123.0, 122.2, 120.5, 111.1, 104.9, 102.9, 82.9, 55.6, 53.9, 49.9, 45.9, 45.6, 44.9, 37.3, 35.4, 29.7, 26.5, 24.7. HRMS: m/z [M+] calcd for C27H23NO2Br2: 551.0096; found: 551.0087.