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All new compounds showed satisfactory analytical data for the assigned structure and purity. Spectroscopic Data for Selected Compounds Compound 1d: [α]D +142.8 (c 0.55, CHCl3, lit.2 [α]30 +115.5 (c 1.52, MeOH, 1H NMR (400 MHz, CDCl3, δ, 6.88-6.84 (dt, J, 10.1, 3.4 Hz, 1 H, 6.01-5.98 (dt, J, 9.8, 1.8 Hz, 1 H, 4.65-4.58 (m, 1 H, 4.09-4.04 (m, 1 H, 2.40-2.37 (m, 2 H, 2.02-1.95 (m, 1 H, 1.77-1.72 (dt, J, 12.6, 4.1 Hz, 1 H, 1.23 (d, J, 6.3 Hz, 3 H, 13C NMR (100 MHz, CDCl3, δ, 163.9, 145.1, 121.2, 76.8, 65.2, 43.6, 29.5, 23.7. Compound 1a: [α]D -115.5 (c 0.17, CHCl3, lit.22 [α]25 -111 (c 1, CHCl3, 1H NMR (400 MHz, CDCl3, δ, 6.89-6.84 (ddd, J, 13.9, 6.7, 4.6 Hz, 1 H, 6.01-5.97 dt, J
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