、
2,2-dimethylpropanoic acid;methyl (2S)-5-amino-2-[(2,4-dimethoxyphenyl)methyl-prop-2-enoxycarbonylamino]pentanoate 在
4-二甲氨基吡啶 作用下,
以
四氢呋喃 为溶剂,
反应 16.0h,
以86 mg的产率得到N
5-<4-<(2R,3R,3aS,5R,5aS,6R,7R,8aR,8bS)-5-(tert-butyldimethylsiloxy)-6-ethyl-2-formyldodecahydro-7-methyl-as-indacen-3-yl>tetroloyl>-N
2-carboxy-N
2-(2,4-dimethoxybenzyl)-L-ornithine, N
2-allyl methyl ester, 2-(dimethyl acetal)