(S)-2-{[(S)-2-(Acetyl-methyl-amino)-4-methyl-pentanoyl]-methyl-amino}-3-methyl-butyric acid 、
(E)-(2S,3R,4R)-3-Hydroxy-4-methyl-2-methylamino-oct-6-enoic acid ((S)-1-dimethylcarbamoyl-propyl)-methyl-amide 在
N-甲基吗啉 、 (benzotriazo-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate 作用下,
以75%的产率得到(E)-(2S,3R,4R)-2-[((S)-2-{[(S)-2-(Acetyl-methyl-amino)-4-methyl-pentanoyl]-methyl-amino}-3-methyl-butyryl)-methyl-amino]-3-hydroxy-4-methyl-oct-6-enoic acid ((S)-1-dimethylcarbamoyl-propyl)-methyl-amide