tert-Butyl bromoacetate → HCID 15896050, compound

Temperature

-78 °C

N--Octyl-toluene-4-sulfonamide (7.0 g, 0.025 mol) was dissolved in dry THF (200 ml) and cooled to -78° C. A 1M solution of LHMDS in THF (27.2 ml, 0.028 mol) was then added over 10 minutes. The reaction mixture was allowed to warm to -400° C. with stirring over 30 minutes. Neat tert-butyl bromoacetate (4.8 ml, 0.03 mol) was added over 5 minutes and the reaction mixture was allowed to warm to ambient temperature overnight. The reaction mixture was diluted with saturated aqueous NH4Cl (200 ml) and ethyl acetate (200 ml). The organic layer was separated and washed consecutively with 1M HCl, 0.5M Na2CO3 and brine, dried over Na2SO4, filtered and concentrated in vacuo. The resulting crude oil was purified by flash chromatography (silica gel, 6% ethyl acetate in hexane) to give the title compound as a white solid (5.2 g, 53%). 1H NMR: δ (CDCl3), 7.72 (2H, d, J=8.3 Hz), 7.27 (2H, d, J=8.4 Hz), 3.94 (2H, s), 3.23 (2H, dd, J=7.5, 7.6 Hz), 2.42 (3H, s), 1.60-1.42 (2H, m), 1.39 (9H, s), 1.34 -1.17 (10H, m), 0.88 (3H, t, J=6.9 Hz).

1. temperatureto warm to -400° C.
2. temperatureto warm to ambient temperature overnight
3. customThe organic layer was separated
4. washwashed consecutively with 1M HCl, 0.5M Na2CO3 and brine
5. dry with materialdried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customThe resulting crude oil was purified by flash chromatography (silica gel, 6% ethyl acetate in hexane)

ORD record

ord-b20a91db86c74977bcba28c0d4a5263c

Source dataset

uspto-grants-2000_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06022898