Studies on tetrahydroisoquinolines. XXIV. A synthesis of dibenzo(c,f)-1-azabicyclo(3.3.1)nonanes and dibenzo(d,g)-1-azabicyclo(4.3.1)decanes.
作者:HIROSHI HARA、OSAMU HOSHINO、BUNSUKE UMEZAWA
DOI:10.1248/cpb.33.2705
日期:——
Treatment of the N-benzyl p-quinol acetates 2a and 2b with trifluoroacetic acid gave dibenzo [c, f]-1-azabicyclo [3.3.1] nonanes (3a and 3b) in good yields. The homologs 3c, 3d, and 3e were similarly prepared from the N-phenethyl p-quinol acetates 2c, 2d, and 2e, respectively. On the other hand, the o-quinol acetate (17), obtained from the tetrahydroisoquinolin-6-ol (9) by lead tetraacetate oxidation, was rearranged to the 4-acetoxy derivative (18). Acid treatment of 18 induced cyclization to construct the same skeleton as that of 3a.
用三氟乙酸处理N-苄基对喹诺乙酸酯2a和2b,以良好的收率得到了二苯并[c,f]-1-氮杂双环[3.3.1]壬烷(3a和3b)。类似地,从N-苯乙基对喹诺乙酸酯2c、2d和2e分别制备了同系物3c、3d和3e。另一方面,从四氢异喹啉-6-醇(9)通过四乙酸铅氧化获得的邻喹诺乙酸酯(17)被重排为4-乙酸基衍生物(18)。对18进行酸处理引发环化,构建了与3a相同的骨架。