反应详情

To a suspension of 1.0 g (5.3 mmol) of 6,8-dihydro-1-thia-3,6-diaza-as-indacen-7-one in 7.5 mL of DMF was added 1.38 g (6.80 mmol) of N,N-dimethylformamide-di-t-butyl acetal. The mixture was stirred at ambient temperature for 1 h and diluted with 7.5 mL of Et2O. The resulting precipitate was isolated filtration to afford 8-dimethylamino-methylene-6,8-dihydro-1-thia-3,6-diaza-as-indacen-7-one as a tan solid (1.0 g, 77%): 1H NMR (DMSO-d6): δ3.33 (bs, 3H), 3.59 (bs, 3H), 6.97 (d, J=8.4,1 H), 7.33 (s,1H), 7.62 (d, J=8.4, 1H), 9.13 (s, 1H), 10.29 (s, 1H); APCI−MS: m/z 246 (M+H)+.

1. customThe resulting precipitate was isolated
2. filtrationfiltration