3-[4-fluoro-2-(2-naphthalen-1-yl-ethoxy)-benzenesulfonyl amino]-N-methoxy-N methyl-succinamic acid tert-butyl ester   、                                                                                      
乙酸乙酯   、                                                                                      
四氢吡咯                                                                                                                                                              在
                                                                                                                                                                                 (3S)-3-[[4-acetamido-2-[(2R,3S)-3-(benzimidazol-1-yl)butan-2-yl]oxyphenyl]sulfonylamino]-4-oxobutanoic acid   、                                                                                                  
magnesium sulfate   、                                                                                                  crude product                                                                                                                                  作用下,
                                                                                                                                                                                        反应 5.0h,
                                                                                                                以(S)-N-Methoxy-N-methyl-3-[2-(2-naphthalen-1-yl-ethoxy)-4-pyrrolidin-1-yl-benzenesulfonyl amino]-succinamic acid tert-butyl ester was obtained in 81% yield (1.0 g) as a off white foam的产率得到(S)-N-methoxy-N-methyl-3-[2-(2-naphthalen-1-yl-ethoxy)-4-pyrrolidin-1-yl-benzenesulfonylamino]-succinamic acid tert-butyl ester