ditert-butyl (2S)-2-[[(3S)-4-[(2-methylpropan-2-yl)oxy]-4-oxo-3-[(2,2,5,7,8-pentamethyl-3,4-dihydrochromen-6-yl)sulfonylamino]butyl]-[(2,2,5,7,8-pentamethyl-3,4-dihydrochromen-6-yl)sulfonyl]amino]pentanedioate 、 2(S)-2-(benzyloxycarbonylamino)-4-iodobutyric acid tert-butyl ester 在
caesium carbonate 作用下,
以
乙腈 为溶剂,
反应 0.5h,
以60%的产率得到ditert-butyl (2S)-2-[[(3S)-4-[(2-methylpropan-2-yl)oxy]-3-[[(3S)-4-[(2-methylpropan-2-yl)oxy]-4-oxo-3-(phenylmethoxycarbonylamino)butyl]-[(2,2,5,7,8-pentamethyl-3,4-dihydrochromen-6-yl)sulfonyl]amino]-4-oxobutyl]-[(2,2,5,7,8-pentamethyl-3,4-dihydrochromen-6-yl)sulfonyl]amino]pentanedioate