cyclopropyl(4-ethynylbenzyl)carbamic acid tert-butyl ester 、
4-(2,2-二溴乙烯基)苯甲酸甲酯 以to provide the desired compound 5 (615 mg, 36%) as a white solid的产率得到4-(4-(4-((tert-butoxycarbonyl(cyclopropyl)amino)methyl)phenyl)buta-1,3-diynyl)benzoic acid methyl ester