Synthetic anthracyclinones-XXVII anthracyclinones by intramolecular marschalk reaction
作者:Karsten Krohn、Wahyudi Priyono
DOI:10.1016/s0040-4020(01)91521-2
日期:1984.1
1,4,5-Trihydroxy-9,10-anthraquinone is transformed regioselectively to the α-hydroxy dichlorides 18-21, which are cyclized to yield predominantely the naturally configurated 9,10-trans-diols 1,3,26, and 27 (80 to 96% d.e.). The monotrifluoroacetates 38-40 derived from the trans-diols are hydroxylated via bromination at C-7 to yield almost exclusively the 7,9-cis-9,10-trans-triols α1-rhodomycinone (4)
1,4,5-三羟基-9,10-蒽醌区域选择性转化为α羟基二氯化物18-21,其环化,得到predominantely天然可配置9,10-反式-diols 1,3,26,和27(80至96%de)。所述monotrifluoroacetates 38-40从派生反式-diols经由溴化羟基在C-7,以产生几乎完全7,9-顺-9,10-反三醇α 1 -rhodomycinone(4),feudomycinone d(7)和4- 0-甲基-β-菱霉素(42)。通过10个脱氧化合物33和34的羟基化反应,获得了具有较低的化学和立体选择性的非地霉素A(5)和C(6)。