(RS)-carbonic acid 1-chloro-ethyl ester 4-(4-fluoro-benzyloxy)-benzyl ester 以
piperazine-1-carboxylic acid 4-benzyloxy-benzyl ester 、 piperazine-1,4-dicarboxylic acid 4-benzyloxy-benzyl ester 9H-fluoren-9-ylmethyl ester 为溶剂,
生成 piperazine-1-carboxylic acid 4-(4-fluoro-benzyloxy)-benzyl ester