Triethylamine → Methyl 4-formylcyclohexane-1-carboxylate

Participants

Reaction Steps

The title intermediate (700 mg, 1.87 mmol, 40%) was obtained as a white solid from 4-formyl-cyclohexanecarboxylic acid methyl ester (800 mg, 4.7 mmol) and 4-iodoaniline (601 mg, 2.74 mmol) analogously to Intermediate 75.7. HPLC: GtRet=7.874 min; LC-MS: m/z 374.2 [M+H]+. 4-Formyl-cyclohexanecarboxylic acid methyl ester was prepared by the following method. To a solution of trans-4-hydroxymethyl-cyclohexanecarboxylic acid methyl ester (which is reported in Synthesis Comm. (1982) page 42-43) (861 mg, 5.0 mmol) and Et3N (2.1 mL, 15.0 mmol) in DCM (16 mL) was slowly added a solution of pyridine sulfur trioxide (2.39 g, 15 mmol) in DMSO (10 mL) at 0° C. (ice bath). After 70 min stirring, it was then diluted into DCM and washed with water. The organic layer was dried over Na2SO4, filtered and evaporated to dryness. This crude material (0.8 g, 4.7 mmol) was used for the next step without further purification.

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