反应详情

(S)-tert-butyl (4-methyl-1-((6-methyl-5-oxo-5,6-dihydrobenzo[c][2,7]naphthyridin-8-yl)oxy)pentan-2-yl)carbamate (0.4 g, 0.714 mmol), prepared as described in Example 19, Part B, was subjected to chlorination using NCS as described in Example 41, to afford (S)-tert-butyl (1-((9-chloro-6-methyl-5-oxo-5,6-dihydrobenzo[c][2,7]naphthyridin-8-yl)oxy)-4-methylpentan-2-yl)carbamate (0.3 g, 0.437 mmol, 61% yield) as a yellow solid. LC/MS (ESI) m/e 460.2 [(M+H)+, calcd for C24H31ClN3O4, 460.2]; LC/MS retention time (Method C) tR=2.17 min.