2'-(phenethyl)thiol to representative vinyl sulfonyl Michael acceptors were measured. The dependence of the reactivity of the Michael acceptor on the nature of the sulfonyl R substituent was determined in order to evaluate the effect of these substituents on the inactivation kinetics of comparably substituted vinyl sulfonyl cysteine protease inhibitors. The rates of these Michael additions vary over 3 orders of magnitude
[反应:见正文]测量了2'-(苯乙基)
硫醇向代表性的
乙烯基磺酰基迈克尔受体的迈克尔加成的相对速率。确定迈克尔受体的反应性对磺酰基R取代基的性质的依赖性,以评估这些取代基对相当取代的
乙烯基磺酰基半胱
氨酸蛋白酶抑制剂的失活动力学的影响。这些迈克尔加成的速率变化超过3个数量级,其中苯基
乙烯基磺酸酯(R = OPh)为约3。反应活性是N-苄基
乙烯基磺酰胺(R = NHBn)的3000倍。