Azide-Mediated Detosylation
of <i>N</i>-Tosylpyrroloiminoquinones and <i>N</i>-Tosylindole-4,7-quinones
作者:Sadanandan Velu、Swayamprabha Patel、Dwayaja Nadkarni、Srinivasan Murugesan、Jason King
DOI:10.1055/s-0028-1083570
日期:——
The utility of NaN3 as a reagent for the detosylation of N-tosylpyrroloiminoquinones and N-tosylindole-4,7-quinones is described. The NaN3-mediated detosylation is carried out in polar aprotic solvents such as DMF and DMSO. The reaction occurs under neutral, mild conditions and results in good to excellent yields of the detosylated quinones.
The synthetic and biological studies of discorhabdins and related compounds
作者:Yasufumi Wada、Yu Harayama、Daigo Kamimura、Masako Yoshida、Tomoyuki Shibata、Kousaku Fujiwara、Koji Morimoto、Hiromichi Fujioka、Yasuyuki Kita
DOI:10.1039/c1ob05058c
日期:——
Various analogues of the marine alkaloids, discorhabdins, have been synthesized. The strategy contains spirocyclization with phenyliodine(III) bis(trifluoroacetate) (PIFA), oxidative fragmentation of the β-amino alcohols with the hypervalent iodine reagent C6F5I(OCOCF3)2, the detosylation and dehydrogenation reaction of the pyrroloiminoquinone unit in the presence of a catalytic amount of NaN3 and
已经合成了海洋生物碱的各种类似物discorhabdins。该策略包含螺环化苯碘(III)双(三氟乙酸盐) (PIFA), β-氨基 高价酒精 碘 试剂 C 6 F 5 I(OCOCF 3)2的脱甲苯基化和脱氢反应 吡咯亚氨基醌 催化量的 NaN 3 和桥接醚合成 溴化氢–醋酸作为关键反应。所有合成的化合物通过评价在体外MTT 对人结肠癌细胞系的细胞毒活性试验 HCT-116。此外,discorhabdin A氧杂 还评估了类似物是否针对四种肿瘤模型细胞,即人结肠癌细胞系(威德),是人类前列腺癌细胞系(DU-145)和鼠白血病细胞系(P388和 L1210)。为了鉴定目标,discorhabdin A和discorhabdin A氧杂 类似物由 肝癌专门小组分析。在测试中,discorhabdins对肿瘤细胞可能具有新的作用方式。
A Biomimetic Approach to the Discorhabdin Alkaloids: Total Syntheses of Discorhabdins C and E and Dethiadiscorhabdin D
作者:Kelly Marshall Aubart、Clayton H. Heathcock
DOI:10.1021/jo9815397
日期:1999.1.1
The characteristic spirodienone structure of the discorhabdin alkaloids is readily formed by reaction of the tyramine-substituted indoloquinonimines 26, 35, and 36 with cupric chloride, triethylamine, and oxygen. This cyclization provides a possibly biomimetic route to discorhabdins C and E (41 and 42). The unbrominated spirodienone 40 reacts with hydrogen over Pd/C to give enone 46. Bromination at