N-methyl-N-[(4-(R)-methyldithio)-1-oxopentyl]-S-alanine 、
maytansinol 在
N,N'-二环己基碳二亚胺 、 zinc(II) chloride 作用下,
以
乙醚 、
二氯甲烷 为溶剂,
反应 2.0h,
生成 N
2'-deacetyl-N
2'-[4-(R)-(methyldithio)-1-oxopentyl]maytansine 、 [(1S,2R,3S,5S,6S,16E,18E,20R,21S)-11-chloro-21-hydroxy-12,20-dimethoxy-2,5,9,16-tetramethyl-8,23-dioxo-4,24-dioxa-9,22-diazatetracyclo[19.3.1.110,14.03,5]hexacosa-10,12,14(26),16,18-pentaen-6-yl] (2R)-2-[methyl-[(4R)-4-(methyldisulfanyl)pentanoyl]amino]propanoate