反应详情

Prepared according to general procedure A using tert-butyl 3-(2-hydroxyphenyl)-3-oxopropanoate (18) (236 mg, 1.0 mmol), 2-chlorobenzaldehyde (113 μL, 1.0 mmol) 15 mL benzene, piperidine (10 μL, 0.1 mmol) and glacial acetic acid (5.6 μL, 0.1 mmol), refluxed for 90 min. Purified via recrystallization from hexanes/CH2Cl2, yielding 72 mg (20%) of a white solid. mp=75-78° C. IR (film) 2979.0; 1720.5; 1630.9; 1156.3 cm−1; 1H NMR (500 MHz, CDCl3) δ 11.80 (bs, 1H); 8.19 (s, 1H); 7.50 (d, J=7.9 Hz, 1H); 7.44 (t, J=7.9 Hz, 1H); 7.36 (d, J=7.9 Hz, 1H); 7.26 (d, J=7.9 Hz, 1H); 7.21 (t, J=7.6 Hz, 1H); 7.08 (t, J=7.06, Hz, 1H); 6.97 (d, J=7.9 Hz, 1H); 6.82 (t, J=7.6 Hz, 1H); 1.43 (s, 9H); 13C NMR (125 MHz, CDCl3) δ 200.6, 163.3, 162.8, 139.1, 137.2, 135.0, 134.0, 131.9 (double intensity), 131.3, 130.2, 130.1, 127.2, 120.0, 119.5, 118.5, 83.1, 28.1; LRMS (electrospray): Mass calculated for C20H19ClO4 [M]+, 358.09. Found [M+23]+, 381.5.

1. customPrepared
2. temperaturerefluxed for 90 min
3. customPurified via recrystallization from hexanes/CH2Cl2