A new synthetic strategy for heteroanthracyclines: Total synthesis of D-ring thiophene analogs of daunomycin
作者:Yasumitsu Tamura、Masayuki Kirihara、Jun-ichi Sekihachi、Ryuichi Okunaka、Shin-ichiro Mohri、Teruhisa Tsugoshi、Shuji Akai、Manabu Sasho、Yasuyuki Kita
DOI:10.1016/s0040-4039(00)96434-7
日期:1987.1
The strong base-induced cycloaddition of appropriately functionalized thiophene analogs of homophthalic anhydride constitutes a highly regiospecific and convenient route to the D-ring thiophene analogs ( and ) of daunomycin.
base-induced cycloaddition reaction of 8 with the chloroquinone acetal (29). These cycloadducts (12 and 30) were converted to D-ring thiophene analogues (28 and 38) of daunomycin (1a). Another D-ring thiophene analogue (42) which has a trimethylsilyl substituent in the D-ring was also prepared.