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.
Iminonitroso Diels−Alder Reactions for Efficient Derivatization and Functionalization of Complex Diene-Containing Natural Products
摘要:
A remarkably efficient method for derivatization of complex diene-containing natural products by using stabilized iminonitroso Diels-Alder reactions is described. Turimycin H3, ergosterol, reductiomycin, isoforocidin, colchicine and thebaine were found to react with nitrosopyridines in a highly efficient regio- and stereoselective fashion. Preliminary bioactivity evaluations of turimycin cycloadducts are reported.
N–O Chemistry for Antibiotics: Discovery of <i>N</i>-Alkyl-<i>N</i>-(pyridin-2-yl)hydroxylamine Scaffolds as Selective Antibacterial Agents Using Nitroso Diels–Alder and Ene Chemistry
作者:Timothy A. Wencewicz、Baiyuan Yang、James R. Rudloff、Allen G. Oliver、Marvin J. Miller
DOI:10.1021/jm200794r
日期:2011.10.13
The discovery, syntheses, and structure–activity relationships (SAR) of a new family of heterocyclic antibacterial compounds based on N-alkyl-N-(pyridin-2-yl)hydroxylamine scaffolds are described. A structurally diverse library of ∼100 heterocyclic molecules generated from Lewis acid-mediated nucleophilic ring-opening reactions with nitroso Diels–Alder cycloadducts and nitroso ene reactions with substituted
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.
Iminonitroso Diels−Alder Reactions for Efficient Derivatization and Functionalization of Complex Diene-Containing Natural Products
作者:Fangzheng Li、Baiyuan Yang、Marvin J. Miller、Jaroslav Zajicek、Bruce C. Noll、Ute Möllmann、Hans-Martin Dahse、Patricia A. Miller
DOI:10.1021/ol071322b
日期:2007.7.1
A remarkably efficient method for derivatization of complex diene-containing natural products by using stabilized iminonitroso Diels-Alder reactions is described. Turimycin H3, ergosterol, reductiomycin, isoforocidin, colchicine and thebaine were found to react with nitrosopyridines in a highly efficient regio- and stereoselective fashion. Preliminary bioactivity evaluations of turimycin cycloadducts are reported.