(1S,3R)-3-Methylamino-cyclopentanecarboxylic acid 9H-fluoren-9-ylmethyl ester; compound with trifluoro-acetic acid   、                                                                                      
BOC-L-亮氨酸                                                                                                                                                              在
                                                                                                                                                                                 
N,N-二异丙基乙胺   、                                                                                                  N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 1.0h,
                                                                                                                以737 mg的产率得到(1S,3R)-3-[((S)-2-tert-Butoxycarbonylamino-4-methyl-pentanoyl)-methyl-amino]-cyclopentanecarboxylic acid 9H-fluoren-9-ylmethyl ester