Sodium periodate → HCID 12088010, compound

Participants

Reaction Steps

To a well stirred mixture of sodium periodate (9.7 g, 45.3 mmol) in pH 7 buffer (115 mL) and tetrahydrofuran (115 mL) was added 3-(2-chloro-phenyl)-2-(dimethylamino-vinyl)-4-oxo-3,4-dihydro-thieno[3,2-d]pyrimidine (5.0 g, 15.1 mmol) all at once. The mixture warmed slightly to the touch and was stirred for 1 hour at ambient temperature. The reaction was filtered through celite and the pad was washed with ethyl acetate. The phases were separated from the filtrate and the aqueous layer was extracted with ethyl acetate. The combined organic phase was washed with brine, dried over sodium sulfate and concentrated to a yellow oil. The oil was flash chromatographed on silica gel (70 g) with elution proceeding as follows: 50% methylene chloride/hexane (500 mL), unweighed forerun; 50% ethyl acetate/hexane (1000 mL), 4.6 g (100%) of 3-(2-chloro-phenyl)-4-oxo-3,4-dihydro-thieno[3,2-d]pyrimidine-2-carboxaldehyde as a foam which was a 2:1 mixture of free aldehyde and hydrate and had: 1H NMR δ 9.56 (s) [CHO], 7.94 and 7.87 (pair of d, J=5.2, 5.4 Hz, respectively, 1 H), 7.60-7.30 (m, 5 H), 5.30 (dd, J=7, 9.5 Hz) [hydrate methine CH), 4.76 (d, J=9.5 Hz) [hydrate OH], 3.79 (d, J=7 Hz) [hydrate OH]. Note that the doublets at 4.76 and 3.79 ppm are washed out and the dd at 5.30 ppm is converted to a singlet when deuterium oxide is added to the NMR sample.

Provenance & Evidence