Syntheses of optically active 9-hydroxymethyl- and 9-carbamoyloxymethyl-9-deacetyl-4-demethoxydaunomycinone.
作者:MICHIYO SUZUKI、TERUYO MATSUMOTO、MASAKO OHSAKI、YOSHIKAZU KIMURA、SHIRO TERASHIMA
DOI:10.1248/cpb.35.3658
日期:——
Reduction of (R) -methyl 2, 5, 12-trihydroxy-6, 11-dioxo-1, 2, 3, 4-tetrahydronaphthacene-2-carboxylate ((R) -5) with lithium tri-tert-butoxyaluminum hydride in dimethyl sulfoxide was found to proceed chemoselectively, giving the corresponding alcohol ((R) -11) in 50-55% yield. The produced (R) -alcohol ((R) -11) could be readily isolated as its acetonide ((R) -12) or tert-butyldimethylsilyl ether ((R) -13). Stereoselective C7α -hydroxylation (the anthracycline numbering) of (R) -13 and urethane formation produced the optically active title compounds, which are the aglycones of unnatural anthracyclines showing excellent anticancer activity.
在二甲亚砜中用氢化三叔丁氧基铝锂还原 (R) -2,5,12-三羟基-6,11-二氧代-1,2,3,4-四氢并四苯-2-甲酸甲酯 ((R) -5),发现可进行化学选择性还原,得到相应的醇((R) -11),收率为 50-55%。生成的(R) -醇 ((R) -11)可以很容易地分离成其丙酮((R) -12)或叔丁基二甲基硅醚 ((R)-13)。(R) -13的立体选择性C7α-羟基化(蒽环类编号)和氨基甲酸酯的形成产生了具有光学活性的标题化合物,它们是非天然蒽环类化合物的苷元,具有出色的抗癌活性。