N2-(tert-butoxycarbonyl)-N3-(4-methoxyfumaroyl)-L-2,3-diaminopropanoic acid p-nitrophenyl ester   、                                                                                      
(S)-Amino-[(2R,3S,4R,5R)-5-(2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-3,4-dihydroxy-tetrahydro-furan-2-yl]-acetic acid; hydrochloride                                                                                                                                                              在
                                                                                                                                                                                 
N,N-二异丙基乙胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二甲基亚砜                                                                                  为溶剂,
                                                                                                                                                    反应 17.0h,
                                                                                                                生成                                                 (E)-3-[(S)-2-tert-Butoxycarbonylamino-2-({(S)-carboxy-[(2R,3S,4R,5R)-5-(2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-3,4-dihydroxy-tetrahydro-furan-2-yl]-methyl}-carbamoyl)-ethylcarbamoyl]-acrylic acid methyl ester