描述:
methyl 1-[(3,4-dihydro-6-hydroxy-2,5,7,8-tetramethyl-2-H-[1]-benzopyran-2-yl)carbonyl]-4-(S)-(4-nitrophenoxy)-pyrrolidine-2-(S)-carboxylate 以95%的产率得到methyl 1-[(3,4-dihydro-6-hydroxy-2,5,7,8-tetramethyl-2-H-[1]-benzopyran-2-yl)carbonyl]-4-(S)-(4-aminophenoxy)-pyrrolidine-2-(S)-carboxylate