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.
phenazines could block the infectivity of chlamydiae without host cell toxicity. OBJECTIVE The aim of this study was to design and synthesize two series of novel3-substituted phenazines to find novel antichlamydial agents. METHODS The 3-substituted phenazines were synthesized via Buchwald-Hartwig cross coupling reaction and Suzuki reaction from 3-bromo-1-methoxyphenazine. The antichlamydial activity
Application of the β-azidonation reaction to the synthesis of the antitumor alkaloid (+)-pancratistatin
作者:Philip Magnus、Iyassu K. Sebhat
DOI:10.1016/s0040-4020(98)00975-2
日期:1998.12
gave the ketone29. Chirality was introduced by deprotonation of29 with the lithium salt of (+)-bis(α-methylbenzyl)amine, followed by triisopropylsilyl trifluoromethanesulfonate to give30 (95%). β-Azidonation of30 with (PhIO)n/TMSN3 rapidly produced31 (95%) as a mixture of trans- and cis- diastereomers in a 3.5:1 ratio. Reduction with LiAlH4 followed by methyl chloroformate/pyridine gave32, which on