cis-3-hydroxy-L-proline ethyl ester hydrochloride 、
2-(tert-butoxycarbonylamino)-3-(5,6-dichloro-2-(2-methylbut-3-en-2-yl)-1H-indol-3-yl)propanoic acid 在
N,N-二异丙基乙胺 、 N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate 作用下,
以
乙腈 为溶剂,
反应 3.0h,
以68%的产率得到ethyl (2S,3R)-1-(2-(tert-butoxycarbonylamino)-3-(5,6-dichloro-2-(2-methylbut-3-en-2-yl)-1H-indol-3-yl)propanoyl)-3-hydroxypyrrolidine-2-carboxylate