(S)-tert-butyl 3-((2-(pent-4-enoyloxy)ethyl)carbamoyl)hex-5-enoate   、                                                                                      (S,E)-tert-butyl 2-(5,12-dioxo-1-oxa-4-azacyclododec-8-en-6-yl)acetate   、                                                                                      
三氟乙酸   、                                                                                      (S,E)-2-(5,12-dioxo-1-oxa-4-azacyclododec-8-en-6-yl)acetic acid   、                                                                                      
对氯苄胺                                                                                                                                                              在
                                                                                                                                                                                 ice water                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷   、                                                                                         
methanol-dichloromethane                                                                                  为溶剂,
                                                                                                                                                    反应 4.0h,
                                                                                                                以The product (70 mg) was obtained as a white solid in 58% yield over 3 steps after column chromatography (MeOH/DCM gradient)的产率得到