反应详情

The procedure used for the preparation of 9a was repeated with 8l (167 mg, 0.279 mmol), Et3SiH (0.446 mL, 2.79 mmol), and trifluoroacetic acid (0.860 mL, 11.2 mmol) in dry ClCH2CH2Cl (6 mL) am 0° C. under nitrogen to give 9l (112 mg, 93%) as a yellowish solid after crystallization from THF/CH2Cl2 /hexane. mp 180° C. (dec); IR (KBr) 3540-2540 (br), 3280, 1774, 1725, 1661 cm-1 ; 1H NMR (DMSO-d6) δ1.97 (3H, s, CH3),3.30 (1H, d, J=18.0Hz), 3.51 (1H, d J=18.0 Hz), 3.79 (2H, s, CH2), 4.99 (1H, d, J=4.6 Hz), 5.56 (1H, dd, J=8.1 and 4.6 Hz), 7.37 (1H, dd, J=8.4 and 4.3 Hz), 7.44 (1H, dd, J=8.4 and 1.0 Hz), 7.58 (1H, s), 8.14 (1H, dd, J=4.3 and 1.0 Hz), 9.11 (1H, d, J=8.1 Hz, NH), 11.64 (1H, s, OH), 13.12 (1H, br s, CO2H); FDMS m/z 432 (M+), 433 (M+ +1); Anal. Calcd for C18H16N4O5S2 : C, 49.99; H, 3.73; N, 12.95. Found: C, 50.24; H, 3.58; N, 12.68.

1. customam 0° C. under nitrogen