(1R,2R)-1-amino-N-cyclopropylsulfonyl-2-ethylcyclopropane-1-carboxamide;4-methylbenzenesulfonic acid 、
(1R,21S,24S)-21-tert-butyl-16,16-dimethyl-3,19,22-trioxo-2,18-dioxa-4,20,23-triazatetracyclo[21.2.1.1(4,7).0(6,11)]heptacosa-6,8,10-triene-24-carboxylic acid 在
(1R,2R)-1-amino-N-cyclopropylsulfonyl-2-ethylcyclopropane-1-carboxamide;4-methylbenzenesulfonic acid 作用下,
以87的产率得到21-tert-butyl-N-[1-(cyclopropylsulfonylcarbamoyl)-2-ethylcyclopropyl]-16,16-dimethyl-3,19,22-trioxo-2,18-dioxa-4,20,23-triazatetracyclo[21.2.1.14,7.06,11]heptacosa-6(11),7,9-triene-24-carboxamide