Hydrochloric Acid → 5-(4-Nitro-phenyl)-3-oxo-pentanoic acid ethyl ester

Temperature

-78 °C

A solution of malonic acid monoethyl ester (16.9 g, 128 mmol) in dry THF (200 mL) was cooled to -78° C. under nitrogen, treated dropwise with 130 mL of isopropyl magnesium chloride (2.0 M in THF; 260 mmol), and stirred at -78° C. for 45 minutes. A solution of 3-(4-nitrophenyl)propanoyl chloride prepared in Example EE (13.5 g, 64 mmol) in dry THF (100 mL) was added dropwise. When addition was complete, the reaction mixture was stirred at -78° C. for 1 hour and then allowed to warm to room temperature, where the solution was stirred for 3 more hours. A mixture of ice (50 mL) and 3N HCl (100 mL) was added. The solution was extracted with EtOAc, and the combined extracts were washed with brine and dried (MgSO4). Concentration gave the title compound. 1H NMR (CDCl3) δ 1.21 (t, 3 H), 2.88-3.00 (m, 4 H), 3.40 (s, 2 H), 4.13 (q, 2 H), 7.32 (d, 2 H), 8.09 (d, 2 H).

1. additionwas added dropwise
2. additionWhen addition
3. stirringthe reaction mixture was stirred at -78° C. for 1 hour
4. temperatureto warm to room temperature
5. stirringwhere the solution was stirred for 3 more hours
6. additionwas added
7. extractionThe solution was extracted with EtOAc
8. washthe combined extracts were washed with brine
9. dry with materialdried (MgSO4)
10. concentrationConcentration

ORD record

ord-843c09297c324c77a2063ac944af2045

Source dataset

uspto-grants-2000_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06046355