HCID 66978150, compound → HCID 86597204, compound

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A mixture of 3-[2,7,8-trimethyl-6-(tetrahydro-pyran-2-yloxy)-chroman-2-yl]-propan-1-ol (200 mg), pyridinium chlorochromate (PCC)(350 mg), and 4A° molecular sieves (100 mg) in dichloromethane (15 mL) was stirred at RT for overnight. The mixture was passed through a silica gel column chromatography eluting with 30% EtOAc in hexane to give 40 mg of 3-[2,7,8-trimethyl-6-(tetrahydro-pyran-2-yloxy)-chroman-2-yl]-propionaldehyde as an oily product. 1H-NMR (300 MHz, CDCl3) δ (ppm): 9.79 (s, 1H, CHO), 6.67 (s, 1H), 5.23 (d, J=2.2 MHz, 1H), 3.90 (m, 1H), 3.58 (m, 1H), 2.75-2.60 (m, 4H), 2.15, 2.08 (2s, 6H), 2.00-1.58 (m, 10H), 1.23 (s, 3H). 13C-NMR (CDCl3, 75 MHz) δ (ppm): 202.64, 148.26, 145.87, 125.57, 125.41, 117.39, 112.93, 112.87, 97.34, 97.22, 74.33, 62.11, 62.05, 38.58, 32.34, 32.09, 31.60, 31.53, 30.76, 25.41, 23.85, 23.64, 22.36, 19.11, 19.08, 12.11, 11.96. MS (m/z): 333 (MH+), 355 (M+Na+).

Provenance & Evidence