((1S,2R,4S,7S)-2-hydroxy-bicyclo[2.2.1]hept-7-yl)-methyl-carbamic acid tert-butyl ester   、                                                                                      
2-羟基-2,2-二(噻吩-2-基)乙酸乙酯                                                                                                                                                              在
                                                                                                                                                                                 
sodium methylate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲苯                                                                                  为溶剂,
                                                                                                                                                                                        以70%的产率得到hydroxy-di-thiophen-2-yl-acetic acid (1S,2R,4S,7S)-7-(tert-butoxycarbonyl-methyl-amino)-bicyclo[2.2.1]hept-2-yl ester