反应详情

Compound 269a was synthesized from compound 268a (3.50 g, 1 eq) as an orange solid in 84% yield, following the procedure as described for compound 218a (80° C. overnight). 1H NMR (CDCl3, 400 MHz): δ (ppm) 1.04-1.07 (m, 4H), 2.13-2.18 (m, 1H), 4.06 (s, 3H), 6.75 (s, 1H), 7.06 (d, J=9.10 Hz, 1H), 7.09 (s, 1H), 8.27 (d, J=9.10 Hz, 1H), 9.92 (br s, 1H); MS (ESI, EI+): m/z=333.13 (MH+).