Syntheses and Biological Activity Studies of Novel Sterol Analogs from Nitroso Diels−Alder Reactions of Ergosterol
摘要:
A series of novel sterol analogs was prepared using nitroso Diels-Alder reactions with ergosterol. Most cycloaddition reactions proceeded in an excellent regio- and stereoselective fashion. Further N-O bond cleavage of cycloadducts generated compounds with biological activity in PC-3 and MCF-7 cancer cell lines.
Syntheses of New Spirocarbocyclic Nucleoside Analogs Using Iminonitroso Diels−Alder Reactions
作者:Weimin Lin、Anuradha Gupta、Kyung Hee Kim、David Mendel、Marvin J. Miller
DOI:10.1021/ol802553g
日期:2009.1.15
dienes coupled efficiently in a series of iminonitroso Diels−Alder reactions to produce a series of new spirocyclic adducts. Hydrogenolysis of these adducts afforded new spirocycles that contain multiple handles for further functionalization. Furthermore, stereocontrolled dihydroxylation and reductive cleavage of the spirocyclic adducts generated versatile scaffolds for the syntheses and derivatization
N -Cbz-和Boc-保护的螺环二烯通过环戊二烯的二烷基化制备。这些二烯在一系列亚氨基亚硝基 Diels-Alder 反应中有效偶联,以产生一系列新的螺环加合物。这些加合物的氢解提供了新的螺环,其中包含用于进一步功能化的多个手柄。此外,螺环加合物的立体控制二羟基化和还原裂解为新型螺环碳环核苷类似物的合成和衍生化提供了多功能支架。
Syntheses and biological evaluation of ring-C modified colchicine analogs
作者:Baiyuan Yang、Zhiqing C. Zhu、Holly V. Goodson、Marvin J. Miller
DOI:10.1016/j.bmcl.2010.03.056
日期:2010.6
Ring-C modified alkaloids were synthesized from colchicine using iminonitroso Diels–Alder reactions in a highly regio- and stereoselective fashion. Several analogs exhibited cytotoxic activity similar to that of colchicine itself against PC-3 and MCF-7 cancer cell lines, by serving as prodrugs of colchicine through retro Diels–Alder reactions under the assayed conditions. In vitro microtubule polymerization
使用亚氨基亚硝基 Diels-Alder 反应以高度区域和立体选择性的方式从秋水仙碱合成环 C 修饰的生物碱。几种类似物表现出类似于秋水仙碱本身对 PC-3 和 MCF-7 癌细胞系的细胞毒活性,通过在测定条件下通过逆狄尔斯-阿尔德反应作为秋水仙碱的前药。体外微管聚合试验表明这些修饰影响了它们与微管蛋白的相互作用。
Efficient Catalytic Enantioselective Hydroxyamination of α-Aryl-α-Cyanoacetates with 2-Nitrosopyridines
no]acetates with quaternary stereocenters and potential antibacterial activities were obtained in excellent yields with good to excellent ee values under as low as 0.05 mol % catalyst loading. The products could be easily transformed to useful α‐amino amides and 1,2‐diamines. Besides, a possible transition state model was proposed to elucidate the origin of the chirality induction.
Preparation and biological evaluation of novel leucomycin analogs derived from nitroso Diels–Alder reactions
作者:Baiyuan Yang、Tina Zöllner、Peter Gebhardt、Ute Möllmann、Marvin J. Miller
DOI:10.1039/b922450e
日期:——
A series of 10,13-disubstituted 16-membered macrolides was synthesized using nitroso DielsâAlder reactions of leucomycin A7. Despite the extensive constituent functionalities in leucomycin, the hetero cycloaddition reactions proceeded in a highly regio- and stereoselective fashion. Subsequent chemical modifications of the nitroso cycloadducts, including NâO bond reduction, were also conducted. Most leucomycin derivatives retained antibiotic profiles similar to leucomycin A7, and, in contrast to leucomycin itself, several exhibited moderate antiproliferative and cytotoxic activity.
Syntheses and Biological Activity Studies of Novel Sterol Analogs from Nitroso Diels−Alder Reactions of Ergosterol
作者:Baiyuan Yang、Patricia A. Miller、Ute Möllmann、Marvin J. Miller
DOI:10.1021/ol900997t
日期:2009.7.2
A series of novel sterol analogs was prepared using nitroso Diels-Alder reactions with ergosterol. Most cycloaddition reactions proceeded in an excellent regio- and stereoselective fashion. Further N-O bond cleavage of cycloadducts generated compounds with biological activity in PC-3 and MCF-7 cancer cell lines.