The present invention is relates to an improved process for the preparation (1S,4S,7Z,10S,16E,21R)-7-ethylidene-4,21-bis(1-methylethyl)-2-oxa-12,13-dithia-5,8,20,23-tetraazabi-cyclo[8.7.6]tricos-16-ene-3,6,9,19,22-pentone of formula I.
本发明涉及一种制备式 I 的(1S,4S,7Z,10S,16E,21R)-7-亚乙基-4,21-双(1-甲基乙基)-2-氧杂-12,13-二
硫杂-5,8,20,23-四
氮杂双环[8.7.6]三os-16-烯-3,6,9,19,2
2-戊酮的改进工艺。