Ethyl Acetate → HCID 118353311, compound

Participants

Reaction Conditions

Reaction Steps

To (E)-ethyl 3-(5-bromo-2-(cyclopropylmethoxy)phenyl)acrylate (S6) (3.78 g, 11.6 mmol, 1.00 equiv) in PhMe (30 mL) in a flame-dried round-bottom flask under a N2 atmosphere at −78 ° C. was added a 1.0 M solution of diisobutylaluminum hydride (DIBAL-H) in PhMe (26 mL, 26 mmol, 2.2 equiv) in 6 portions dropwise every 10 minutes for 1 hour. The reaction was warmed to 0 ° C. over 2 hours and then warmed to 23 ° C. and stirred at this temperature for 1 hour. The reaction mixture was poured onto a concentrated aqueous Rochelle's salt (potassium sodium tartrate) solution (400 mL). EtOAc (400 mL) was added and the mixture was stirred for 3 hour until two liquid phases separated cleanly. The phases were partitioned and the aqueous phase was extracted from with EtOAc (300 mL). The organic phases were combined and washed with brine (200 mL), dried with Na2SO4, and concentrated in vacuo. The residue was purified by chromatography on silica gel, eluting with a gradient of 10-25% EtOAc in hexanes (v/v) to afford 2.77 g of the title compound as a colorless solid (84% yield). Rf=0.15 (hexanes/EtOAc 6:1 (v/v)). NMR Spectroscopy: 1H NMR (500 MHz, CDCl3, 23 ° C., δ): 7.53 (d, J=2.4 Hz, 1H), 7.26 (dd, J=8.8, 2.4 Hz, 1H), 6.88 (d, J=16.1 Hz, 1H), 6.69 (d, J=8.8 Hz, 1H), 6.39 (dt, J=16.1, 5.9 Hz, 1H), 4.33 (br dd, J=4.6, 4.6 Hz, 2H), 3.79 (d, J=6.8 Hz, 2H), 1.71 (br t, J=5.1 Hz, 1H), 1.31-1.23 (m, 1H), 0.68-0.58 (m, 2H), 0.38-0.30 (m, 2H). 13C NMR (125 MHz, CDCl3, 23 ° C., δ): 155.4, 131.2, 130.5, 129.7, 128.2, 125.0, 114.2, 113.2, 73.7, 64.1, 10.3, 3.4. HRMS-FIA (m/z): calcd for C13H15BrNaO2 [M+Na]+, 305.0153; found, 305.0123.

Provenance & Evidence