(2R)-2-[[(3S)-3-[(3aR,5R,6S,6aR)-6-methoxy-2,2-dimethyl-3a,5,6,6a-tetrahydrofuro[2,3-d][1,3]dioxol-5-yl]-3-[(2-methylpropan-2-yl)oxycarbonylamino]propanoyl]amino]oxypropanoic acid 、 ethyl (2R)-2-[[(3S)-3-[(3aR,5R,6S,6aR)-6-methoxy-2,2-dimethyl-3a,5,6,6a-tetrahydrofuro[2,3-d][1,3]dioxol-5-yl]-3-aminopropanoyl]amino]oxypropanoate;2,2,2-trifluoroacetic acid 在
1-羟基苯并三唑 、
盐酸-N-乙基-Nˊ-(3-二甲氨基丙基)碳二亚胺 、
N,N-二异丙基乙胺 作用下,
以
二氯甲烷 为溶剂,
反应 5.25h,
以52%的产率得到ethyl (2R)-2-[[(3S)-3-[(3aR,5R,6S,6aR)-6-methoxy-2,2-dimethyl-3a,5,6,6a-tetrahydrofuro[2,3-d][1,3]dioxol-5-yl]-3-[[(2R)-2-[[(3S)-3-[(3aR,5R,6S,6aR)-6-methoxy-2,2-dimethyl-3a,5,6,6a-tetrahydrofuro[2,3-d][1,3]dioxol-5-yl]-3-[(2-methylpropan-2-yl)oxycarbonylamino]propanoyl]amino]oxypropanoyl]amino]propanoyl]amino]oxypropanoate