tert-butyl 2-{(9S,10S,18S,14R)-7,16,19-triaza-10-[4-(tert-butoxy)phenyl]-18-(carbamoylmethyl)-14-[(5-methylindolyl)methyl]-8,17,20-trioxospiro[5.14]icos-11-en-9-yl}acetate 在
ethandithiol 、
三氟乙酸 作用下,
反应 1.1h,
以20%的产率得到[(E)-(9S,10S,14R,18S)-18-Carbamoylmethyl-10-(4-hydroxy-phenyl)-14-(5-methyl-indol-1-ylmethyl)-8,17,20-trioxo-7,16,19-triaza-spiro[5.14]icos-11-en-9-yl]-acetic acid