HCID 86653081, compound → HCID 67191992, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of above crude (2-(trimethylsilyl)ethyl)(R)-2-(t-butoxycarbonylamino)-2-formylethylmethylcarbamate (0.71 g, 2.05 mmol) in toluene (6 mL) at −78° C. was added cyclohexylmagnesium chloride (2 M in ether, 5.13 mL) dropwise. The resulting solution was stirred at −78° C. for 1 h, allowed to warm slowly to rt, and quenched with sat'd aq NH4Cl (5 mL). The organic layer was separated, and aqueous layer was extracted with ether (2×5 mL). The combined organic layers were concentrated in vacuo, and the residue was purified by flash column chromatography to give (1R,2R)-2-(t-butoxycarbonylamino)-1-cyclohexyl-3-(N-methyl-N-(2-(trimethylsilyl)ethoxycarbonyl)amino)propan-1-ol (209.7 mg, 24%). 1H NMR (400 MHz, CDCl3): 4.94 (d, 1H), 4.16 (m, 2H), 3.80 (m, 1H), 3.78 (m, 1H), 3.04 (m, 1H), 2.88 (m, 1H), 2.86 (s, 3H), 2.10 (m, 1H), 1.64 (m, 4H), 1.42 (m, 1H), 1.40 (s, 9H), 1.28-1.02 (m, 4H), 0.98 (m, 2H), 0.82 (m, 4H), 0.02 (s, 9H); MS m/z 431 (M+H+).

Provenance & Evidence