An efficient, regiospecific synthesis of 4-demethoxydaunomycinone and daunomycinone.
作者:YASUMITSU TAMURA、MANABU SASHO、SHUJI AKAI、HISAKAZU KISHIMOTO、JUN-ICHI SEKIHACHI、YASUYUKI KITA
DOI:10.1248/cpb.35.1405
日期:——
4-Methoxy and 4-acetoxyhomophthalic anhydrides were prepared by convenient oxidations of homophthalic acid derivatives followed by hydrolysis and dehydrative cyclization. Strong base-induced cycloaddition of these anhydrides to 2-ehloro-6, 6-ethylenedioxy-5, 6, 7, 8-tetrahydro-1, 4-naphthoquinone gave the tetracyclic adducts, which were efficiently converted into 4-demethoxydaunomycinone and daunomycinone.
A highly convergent strategy for the synthesis of 4-demethoxydaunomycinone and daunohycinone: A novel synthesis of C4-acetoxylated homophthalic anhydrides
作者:Yasumitsu Tamura、Manabu Sasho、Shuji Akai、Hisakazu Kishimoto、Jun-ichi Sekihachi、Yasuyuki Kita
DOI:10.1016/s0040-4039(00)83975-1
日期:1986.1
The C4-acetoxyl derivatives of homophthalicanhydrides were prepared by a convenient α-acetoxylation of homophthalic acid followed by a dehydrative cyclization. The anhydrides have been converted into 4-demethoxydaunomycinone and daunomycinone in excellent overall yields.
A new general regiocontrolled synthesis of anthracyclinones using cycloaddition of homophthalic anhydrides to 2-chloro-6-oxo-5,6,7,8-tetrahydro-1,4-naphthoquinone 1,2-ethanediyl acetal
作者:Yasumitsu Tamura、Akimori Wada、Manabu Sasho、Keiko Fukunaga、Hatsuo Maeda、Yasuyuki Kita
DOI:10.1021/jo00143a052
日期:1982.10
Anthracyclinone syntheses using strong base induced cycloaddition of homophthalic anhydrides and related compounds
作者:Yasumitsu Tamura、Manabu Sasho、Shuji Akai、Akimori Wada、Yasuyuki Kita
DOI:10.1016/s0040-4020(01)91513-3
日期:1984.1
The strong base induced cycloaddition of homophthalic anhydrides and relatedcompounds to halo- 1,4-naphthoquinone derivatives has been shown to provide short convergent syntheses of anthracyclinones, 4-demethoxydaunomycinone (1), daunomycinone (2), 11-deoxydaunomycinone (3), and 11-deoxycarminomycinone (4).