benzyl N-[(1R)-1-(4-methyl-2,6,7-trioxabicyclo[2.2.2]octan-1-yl)-2-oxoethyl]carbamate 、 1-tert-butyl 2-methyl (5R)-5-(benzyloxymethyl)pyrrolidine-1,2-dicarboxylate 在
lithium hexamethyldisilazane 作用下,
以
四氢呋喃 为溶剂,
生成 1-(tert-butyl) 2-methyl (2R,5R)-2-((1R,2R)-2-(((benzyloxy)carbonyl)amino)-1-hydroxy-2-(4-methyl-2,6,7-trioxabicyclo[2.2.2]octan-1-yl)ethyl)-5-((benzyloxy)methyl)pyrrolidine-1,2-dicarboxylate