benzyl 1-((((3R)-1-aza-6-(2,3-dihydro-2,2,4,6,7-pentamethyl-2H-1-benzofuran-5-yl)sulfonyl)guanidino)-3-(9H-9-fluorenylmethoxycarbonylamido)-2-oxohexanyl)cyclobutanecarboxylate 在
哌啶 作用下,
以
乙腈 为溶剂,
以82%的产率得到benzyl 1-(((3R)-3-amino-1-aza-6-[(2,3-dihydro-2,2,4,6,7-pentamethyl-2H-1-benzofuran-5-yl)sulfonyl]guanidino)-2-oxohexan-1-yl)cyclobutanecarboxylate