4-(2-oxo-1,2,4,5-tetrahydro-1,3-benzodiazepin-3-yl)-piperidine-1-carboxylic acid (R)-2-(4-benzyloxy-3,5-dimethyl-phenyl)-1-carboxy-ethyl ester 、 ethyl ([1,4']bipiperidinyl-4-yloxy)-acetate bis-hydrochloride 在
O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate 、
三乙胺 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 4.0h,
以72%的产率得到(R)-1-(4-benzyloxy-3,5-dimethyl-benzyl)-2-(4-ethoxycarbonylmethoxy-1,4'-bipiperidinyl-1'-yl)-2-oxo-ethyl 4-(2-oxo-1,2,4,5-tetrahydro-1,3-benzodiazepin-3-yl)-piperidine-1-carboxylate