Boron trifluoride etherate → 1-tert-Butyl 4-ethyl 5-oxoazepane-1,4-dicarboxylate

Participants

Reaction Conditions

Reaction Steps

To a 0° C. solution of 1-BOC-4-piperidone (20 g, 0.10 mol) in Et2O (200 mL) was added BF3.Et2O (14 mL, 0.11 mol) followed by drop-wise addition of ethyl diazoacetate (13.7 mL, 0.11 mol) over 1 h. After addition was complete, the mixture was stirred at 0° C. for 1 h. The mixture was diluted with 30% aq. Na2CO3 and water at 0° C. and extracted with EtOAc. The combined organic layers were dried (Na2SO4) and concentrated. Purification of the residue (FCC) afforded the title compound (25.6 g, 98%). 1H NMR (CDCl3): 4.25-2.03 (m, 11H), 1.47-1.45 (d, J=7.8 Hz, 9H), 1.31-1.24 (m, 3H).

Provenance & Evidence