(R)-tert-butyl 1-(4-(6-chloro-8-methoxy-4-oxo-4,5-dihydrothieno[2,3-c]quinolin-9-yl)phenyl)ethyl(methyl)carbamate   、                                                                                      
三溴化硼                                                                                                                                                                                                                                                                                                          以to afford the desired product as a white solid (15 mg, 45%)的产率得到(R)-6-chloro-8-hydroxy-9-(4-(1-(methylamino)ethyl)phenyl)thieno[2,3-c]quinolin-4(5H)-one hydrochloride