Chloroacetyl chloride → Benzyl 4-(2-chloroacetyl)morpholine-2-carboxylate

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Reaction Steps

In a 100-mL round-bottom flask, the benzyl morpholine-2-carboxylate (50%, 1.00 g, 2.3 mmol) as the crude tfa salt was taken up in dichloromethane (8 mL), resulting in a white suspension. N-Ethyl-N-isopropylpropan-2-amine (1.4 ml, 7.9 mmol) was added, and the solid dissolved. The solution was cooled to 0 deg, and 2-chloroacetyl chloride (0.20 ml, 2.5 mmol) was added. The reaction mixture was allowed to warm naturally to ambient temperature where it was stirred for 14 h. The reaction mixture was diluted with DCM (75 mL), and the organic layer was extracted with dilute sodium bicarbonate (2×7 mL) then with half-saturated brine (7 mL), then was dried over sodium sulfate. The residue was purified through silica gel (100 mL) which had been deactivated with TEA (10 mL) using 90% EtOAc-hexane, affording the title compound (474 mg, 1.6 mmol). MS m/z 298 (M+1).

Provenance & Evidence