Synthesis and Cytotoxic Activity of Benzo[a]pyrano[3,2-h] and [2,3-i]xanthone Analogues of Psorospermine, Acronycine, and Benzo[a]acronycine
作者:Chavalit Sittisombut、Sabrina Boutefnouchet、Hanh Trinh Van-Dufat、Wen Tian、Sylvie Michel、Michel Koch、François Tillequin、Bruno Pfeiffer、Alain Pierré
DOI:10.1248/cpb.54.1113
日期:——
phloroglucinol afforded 9,11-dihydroxy-12H-benzo[a]xanthen-12-one (6). Construction of an additional dimethylpyran ring onto this skeleton, by alkylation with 3-chloro-3-methyl-1-butyne followed by Claisen rearrangement, gave access to 6-hydroxy-3,3-dimethyl-3H,7H-benzo[a]pyrano[3,2-h]xanthen-7-one (12) and 5-hydroxy-2,2-dimethyl-2H,6H-benzo[a]pyrano[2,3-i]xanthen-6-one (13), which were methylated into 6-methoxy-3
将2-羟基-1-萘甲酸与间苯三酚缩合,得到9,11-二羟基-12H-苯并[a]黄原-12-(6)。通过用3-氯-3-甲基-1-丁炔进行烷基化,然后进行克莱森重排,在该骨架上构建一个额外的二甲基吡喃环,可以得到6-羟基-3,3-二甲基-3H,7H-苯并[a]吡喃并[3,2-h]黄嘌呤-7-一(12)和5-羟基-2,2-二甲基-2H,6H-苯并[a]吡喃并[2,3-i]黄嘌呤-6-(13 ),将其甲基化为6-甲氧基-3,3-二甲基-3H,7H-苯并[a]吡喃并[3,2-h]黄嘌呤-7-一(14)和5-甲氧基-2,2-二甲基-2H,6H-苯并[a]吡喃并[2,3-i]黄嘌呤-6-一(15)。四氧化14和15的氧化得到相应的(+/-)-顺式二醇16和17,其在酰化后得到相应的酯18-21。同样,2-羟基-1-萘甲酸与3的缩合,5-二甲氧基苯胺得到11-氨基-9-甲氧基-12H-苯并[a]黄原-12