(R)-5-[5-(3-chloro-phenylethynyl)-2,4-difluoro-phenyl]-6,6-difluoro-5,7,7-trimethyl-[1,4]oxazepan-3-one   、                                                                                      
劳森试剂                                                                                                                                                                                              以
                                                                                         
1,4-二氧六环                                                                                  为溶剂,
                                                                                                                                                                                        以yielded the (R)-5-[5-(3-chloro-phenylethynyl)-2,4-difluoro-phenyl]-6,6-difluoro-5,7,7-trimethyl-[1,4]oxazepan-3-thione (432 mg, 67% yield) as a light brown gum的产率得到(R)-5-[5-(3-chloro-phenylethynyl)-2,4-difluoro-phenyl]-6,6-difluoro-5,7,7-trimethyl-[1,4]oxazepan-3-thione