Methanol → HCID 67247139, compound

Participants

Reaction Steps

To a cooled (−78° C.) solution of cis-2-methyl-4-oxo-cyclohexanecarboxylic acid ethyl ester (22 g, 119 mmol) and thiazole (16.9 mL, 239 mmol) in THF (154 mL) was added nBuLi (1.6 M in Hex, 74.6 mL, 119 mmol) dropwise at such a rate that the internal temperature was maintained <−65° C. The reaction mixture was stirred for 30 min, MeOH (4.83 mL, 119 mmol) was introduced, and the reaction warmed to room temperature where it was diluted with water and EtOAc. The layers were separated, the organic layer dried with MgSO4, filtered and concentrated in vacuo. The crude residue was purified by flash chromatography to afford 4-hydroxy-2-methyl-4-thiazol-2-yl-cyclohexanecarboxylic acid ethyl ester (21 g, 78 mmol).

Provenance & Evidence