Ethyl 4-phenyl-1,3-thiazole-2-carboxylate → (4-Phenyl-1,3-thiazol-2-yl)methanol

Participants

Reaction Conditions

Reaction Steps

A solution of ethyl 4-phenylthiazole-2-carboxylate (Example 4B, 1.300 g, 5.57 mmol) in diethyl ether (60 mL) in a 500 mL flask under a nitrogen atmosphere was cooled to −40° C. (dry ice-water-calcium chloride bath) and treated with solid LiAH4 (0.40 g, 10.54 mmol) added all at once. The mixture was stirred at −40° C. over 2.5 h. The reaction was quenched by dropwise addition of ethyl acetate (1 mL), water (0.4 mL) followed by 15% aqueous sodium hydroxide (0.4 mL) and water (1.2 mL). The bath was then removed and the mixture was stirred at room temperature for 50 min. The solid formed was filtered and washed with ether (50 mL). The combined filtrate and washing was washed with brine (20 mL) and dried over anhydrous magnesium sulfate. Evaporation gave a yellow oil which was purified by silica gel chromatography (2.5×8 cm, elution toluene-ethyl acetate 9:1, 8:2 to 7:3). The resulting light yellow oil (0.931 g) was then distilled in vacuo (bp: 105-110° C./0.1 torr, bulb to bulb, air bath temperature) to provide the title material (0.918 g, 86%) of a colorless syrup. LC (Method C): 1.672 min. HRMS (ESI) calcd for C10H10NOS [M+H]+ m/z 192.0478, found 192.0508. 1H NMR (CDCl3, 400 MHz) δ ppm: 2.90 (br t, 1H), 5.02 (d, J=4.30 Hz, 2H), 7.31-7.38 (m, 1H), 7.39-7.45 (m, 2H), 7.46 (d, J=0.8 Hz, 1H), 7.85-7.92 (m, 2H).

Provenance & Evidence