4-(3R,5S-dimethyl-piperazin-1-yl)-2-methanesulfonyl-pyrimidine   、                                                                                      1R-(4-trifluoromethanesulfonyloxy-pyrimidin-2-yl)-ethyl butyrate                                                                                                                                                                                              以
                                                                                         
乙腈                                                                                  为溶剂,
                                                                                                                                                                                        以4.01 g (62%)的产率得到1R-{4-[4-(2-Methanesulfonyl-pyrimidin-4-yl)-2R,6S-dimethyl-piperazin-1-yl]-pyrimidin-2-yl}-ethyl butyrate