作者:Masaszumi IKEDA、Serry A.A. EL BIALY、Ken-ichi HIROSE、Miho KOTAKE、Tatsunori SATO、Said M.M. BAYOMI、Ihsan A. SHEHATA、Ali M. ABDELAL、Laila M. GAD、Takayuki YAKURA
DOI:10.1248/cpb.47.983
日期:——
A formal total synthesis of (-)-cephalotaxine (1) has been achieved. The key step is an intramolecular aldol condensation of the diketone 9, which in turn was obtained in three steps from the azabicyclic compound 6 derived from D-proline according to Seebach's procedure. Treatment of 9 with a catalytic amount of sodium 2-methyl-2-butanolate in benzene at room temperature gave the alpha, beta-unsaturated
Regio- and Stereoselective Electrophilic Cyclization Approach for the Protecting-Group-Free Synthesis of Alkaloids Lennoxamine, Chilenine, Fumaridine, 8-Oxypseudoplamatine, and 2-<i>O</i>-(Methyloxy)fagaronine
作者:Tuanli Yao、Zhen Guo、Xiujuan Liang、Lihan Qi
DOI:10.1021/acs.joc.8b02154
日期:2018.11.2
protecting-group-free synthesis of alkaloids lennoxamine, chilenine, fumaridine, 8-oxypseudoplamatine, and 2-O-(methyloxy)fagaronine is reported. The core isoindolin-1-one and isoquinolin-1-one structures were built by a silver-catalyzed regio- and stereoselective cyclization of methyl 2-alkynylbenzimidates. The regioselectivity of cyclization was achieved by utilizing the intrinsic functionality of alkaloids.
Certain N-methoxy-N-methyl amides yield products of formal reduction and/or rearrangement upon exposure to tert-butyldimethylsilyl triflate and collidine or triethylamine.
Synthesis of 11-aminoalkoxy substituted benzophenanthridine derivatives as tyrosyl-DNA phosphodiesterase 1 inhibitors and their anticancer activity
作者:Hao Yang、Fang-Ting Wang、Min Wu、Wenjie Wang、Keli Agama、Yves Pommier、Lin-Kun An
DOI:10.1016/j.bioorg.2022.105789
日期:2022.6
Tyrosyl-DNA phosphodiesterase 1 (TDP1) is an enzyme that repairs DNA lesions caused by the trapping of DNA topoisomerase IB (TOP1)-DNA break-associated crosslinks. TDP1 inhibitors have synergistic effect with TOP1 inhibitors in cancer cells and can overcome cancer cell resistance to TOP1 inhibitors. Here, we report the synthesis of 11-aminoalkoxy substituted benzophenanthridine derivatives as selective
Lithium-iodine exchange initiated cyclization of o-iodo-N-methoxy-N-methyl phenylacetamides provides a simple and efficient route to benzocyclobutenones.