Synthesis, anti-virus and anti-tumour activities of dibenzylbutyrolactone lignans and their analogues
作者:Yamu Xia、Jia You、Yuanyuan Zhang、Zhongliang Su
DOI:10.3184/030823409x12506792542747
日期:2009.9
and seven analogues. Four natural lignans were prepared by this method, and five lignans were synthesised for the first time. The synthesised compounds were evaluated for anti-HIV, anti-HSV, and anti-tumour activities. Results showed that the dibenzylbutyrolactone lignans and their analogues were inactive against HIV Tat transactivation and HSV-1 in vitro, but some compounds displayed significant activity
已开发出二苄基丁内酯木脂素及其类似物的有效合成。基于胡椒醛或藜芦醛与琥珀酸二乙酯的 Stobbe 缩合,以及与 3,4-亚甲基二氧苄基溴的烷基化反应,得到木脂素的骨架。(±)-二酸用奎宁分解并转化官能团以获得三种苄基丁内酯木脂素和七种类似物。采用该方法制备了4种天然木脂素,首次合成了5种木脂素。对合成的化合物进行了抗 HIV、抗 HSV 和抗肿瘤活性的评估。结果表明,二苄基丁内酯木脂素及其类似物在体外对 HIV Tat 反式激活和 HSV-1 无活性,但一些化合物对 MDA-MB-435 人乳腺癌细胞显示出显着的活性。
Unusual visible-light photolytic cleavage of tertiary amides during the synthesis of cyclolignans related to podophyllotoxin
作者:Kamil Lisiecki、Krzysztof K. Krawczyk、Piotr Roszkowski、Jan K. Maurin、Armand Budzianowski、Zbigniew Czarnocki
DOI:10.1016/j.tet.2017.09.021
日期:2017.11
During the attempted photochemical cyclization of 2,3-bisbenzylidene-γ-hydroxybutyric acid cyclic amideester, it was observed that a γ-butyrolactone ring was formed, which was concurrent with the release of the amine fragment from the amide. The process occurs with high yield giving rise to the formation of β-apopicropodophyllin and its regioisomer. Additional experiments confirmed the photochemical
Relationship between structure and efficiency of atropisomeric phosphine ligands in homogeneous catalytic asymmetric hydrogenation
作者:Oleg M. Demchuk、Dieter Arlt、Radomir Jasiński、K. Michal Pietrusiewicz
DOI:10.1002/poc.2998
日期:2012.11
A relationshipbetween the structure of biaryl atropisomeric diphosphine ligands and their efficiency in model rhodium catalyzed asymmetriccatalytichydrogenation reactions have been studied with an attempt to separate the two main factors influencing the performance of the ligand in the catalyst core namely, the steric and the electronic factors. A series of new biaryl atropisomeric bisphosphines
Asymmetric synthesis of (R)- and (S)-4-(substituted benzyl)dihydrofuran-2(3H)-ones: an application of the ruthenium-binap complex-catalysed asymmetric hydrogenation of alkylidenesuccinic acids
A concise synthesis of (S)- or (R)-4-(substituted benzyl)dihydrofuran-2(3H)-ones (1) with high enantiomeric purity is presented. (S)- or (R)-(Substituted benzyl)succinic acids (6) 97% enantiomeric excess) were first prepared by Ru2Cl4[(R)- or (S)-binap)]2(NEt3) catalysed asymmetrichydrogenation of (substituted benzylidene)succinic acids. The diacids (6) were converted into (R)- or (S)-2-(substituted