作者:Masaaki Omote、Akira Ando、Toshiyuki Takagi、Mayumi Koyama、Itsumaro Kumadaki
DOI:10.1016/0040-4020(96)00858-7
日期:1996.10
Benzyl 3,5-dimethyl-2-pyrrolecarboxylate (1) was converted to 4-(2,2,2-trifluoro-1-hydroxyethyl) derivative (2) on treatment with trifluoroacetaldehyde ethyl hemiacetal in the presence of zinc chloride. After protection of the hydroxyl group with a methyl group, 2 was converted to benzyl 4-methyl-3-(2,2,2-trifluoro-1-methoxyethyl)-2-pyrrolecarboxylate (9) and benzyl 5-acetoxymethyl-3-methyl-4-(2,2
在氯化锌的存在下,用三氟乙醛乙基半缩醛处理,将3,5-二甲基-2-吡咯甲酸羧苄酯(1)转化为4-(2,2,2-三氟-1-羟乙基)衍生物(2)。用甲基保护羟基后,将2转化为4-甲基-3-(2,2,2-三氟-1-甲氧基乙基)-2-吡咯羧酸苄酯(9)和5-乙酰氧基甲基-3-苄基4-(2,2,2-三氟-1-甲氧基乙基)-2-吡咯甲酸甲酯(10)。两种酯均缩合为二吡咯甲烷化合物11,将其脱苄基,脱羧并与卟啉的下半部分缩合,得到六氟血卟啉衍生物14,可能对癌症的光动力疗法有用。