Synthesis of (+)-Pancratistatins via Catalytic Desymmetrization of Benzene
作者:Lucas W. Hernandez、Jola Pospech、Ulrich Klöckner、Tanner W. Bingham、David Sarlah
DOI:10.1021/jacs.7b10351
日期:2017.11.8
A concise synthesis of (+)-pancratistatin and (+)-7-deoxypancratistatin frombenzene using an enantioselective, dearomative carboamination strategy has been achieved. This approach, in combination with the judicious choice of subsequent olefin-type difunctionalization reactions, permits rapid and controlled access to a hexasubstituted core. Finally, minimal use of intermediary steps as well as direct
Skeletally Diverse Small Molecules Using a Build/Couple/Pair Strategy
作者:Takuya Uchida、Manuela Rodriquez、Stuart L. Schreiber
DOI:10.1021/ol900173t
日期:2009.4.2
catalytic, stereoselective cross-Mannich reactions followed by intramolecular functional group-pairing reactions of easily accessed variants of the Mannich products are explored as a route to skeletallydiversesmallmolecules. The synthetic pathway yields products having 12 different skeletons using only three steps and has the potential to enable substantial stereochemical diversification in the future.
Enantioselective Synthesis of Isocarbostyril Alkaloids and Analogs Using Catalytic Dearomative Functionalization of Benzene
作者:Tanner W. Bingham、Lucas W. Hernandez、Daniel G. Olson、Riley L. Svec、Paul J. Hergenrother、David Sarlah
DOI:10.1021/jacs.8b12123
日期:2019.1.9
(+)-lycoricidine, and (+)-narciclasine are described. Our strategy for accessing this unique class of natural products is based on the development of a Ni-catalyzed dearomative trans-1,2-carboamination of benzene. The effectiveness of this dearomatization approach is notable, as only two additional olefin functionalizations are needed to construct the fully decorated aminocyclitol cores of these alkaloids.
[EN] ISOCARBOSTYRIL ALKALOIDS AND FUNCTIONALIZATION THEREOF<br/>[FR] ALCALOÏDES D'ISOCARBOSTYRILE ET LEUR FONCTIONNALISATION
申请人:UNIV ILLINOIS
公开号:WO2020117894A1
公开(公告)日:2020-06-11
Enantioselective total syntheses of the anticancer isocarbostyril alkaloids (+)-7-deoxypancratistatin, (+)-pancratistatin, (+)-lycoricidine, and (+)-narciclasine are described. Our strategy for accessing this unique class of natural products is based on the development of a Ni-catalyzed dearomative trans-1,2-carboamination of benzene. The effectiveness of this dearomatization approach is notable, as only two additional olefin functionalizations are needed to construct the fully decorated aminocyclitol cores of these alkaloids. Installation of the lactam ring has been achieved through several pathways and a direct interconversion between natural products was established via a late-stage C-7 cupration. Using this synthetic blueprint, we were able to produce natural products on a gram scale and provide tailored analogs with improved activity, solubility, and metabolic stability.
well-identified reaction products. The IR experimental absorption bands were assigned by comparison with literature data and with simulated infraredspectra obtained by ab initio calculation at the 6-31G level. Stable at the matrix temperature (10 K), 3a and 3b photolyzed to isocyanates and CO when irradiated at lambda >/= 230 nm. Irradiation of 2b at this wavelength induces its decomposition. The kinetic