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.
A new route to the pavine (5,6,11,12-tetrahydro-5,11-imino-13-methyldibenzo[a,e]cyclo-octene) skeleton: synthesis of (±)-argemonine
作者:Takashi Nomoto、Hiroaki Takayama
DOI:10.1039/c39820001113
日期:——
A newroute to the pavineskeleton was investigated starting from the readily accessible tetrahydro-6,12-methanodibenz[c,f]azocine (1,RH or Me); an efficient synthesis of a typical pavine alkaloid (±)-argemonine (6, R = OMe) from (1, R = OMe) was accomplished in 53% overall yield.