Benzene, ((2-bromoethoxy)methyl)- → HCID 11369044, compound

Temperature

0 °C

A solution of 3.0 g (23 mmol) of ethyl cyclobutanecarboxylate in 10 mL of tetrahydrofuran was added to a −78° C. solution of 25.74 mmol of lithium diisopropylamide in 45 ml tetrahydrofuran. The reaction was warmed to 0° C. over 15 min and then cooled to −78° C., followed by the addition of 3.64 mL (25.74 mmol) of benzyl 2-bromoethyl ether in 10 mL of tetrahydrofuran. The reaction was gradually warmed to room temperature over 16 h and then quenched with 20 mL of saturated ammonium chloride. The reaction was concentrated and ethyl acetate was added. The organic layer was isolated, dried with magnesium sulfate, and concentrated under vacuum to afford an oil, which was purified by silica gel chromatography eluting with ethyl acetate:hexane (2:8) to afford 4.3 g (70%) of ethyl 1-[2-(benzyloxy)ethyl]cyclobutanecarboxylate as a colorless oil. 1H NMR (300 MHz, CDCl3) δ 7.31-7.22 (m, 5H), 4.01 (q, J=7 Hz, 2H), 4.40 (s, 2H), 2.40 (t, J=7 Hz, 2H), 1.92-1.84 (m, 6H), 1.14 (t, J=7 Hz, 3H). GC-MS m/z 263 (M+H).

1. temperaturecooled to −78° C.
2. temperatureThe reaction was gradually warmed to room temperature over 16 h
3. customquenched with 20 mL of saturated ammonium chloride
4. concentrationThe reaction was concentrated
5. additionethyl acetate was added
6. customThe organic layer was isolated
7. dry with materialdried with magnesium sulfate
8. concentrationconcentrated under vacuum
9. customto afford an oil, which
10. customwas purified by silica gel chromatography
11. washeluting with ethyl acetate:hexane (2:8)

ORD record

ord-ee2c7f34c3804c26a9a3fcef75b5e1c3

Source dataset

uspto-grants-2007_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07282512B2