Sequential Michael addition/retro-Claisen condensation of 1,3-diarylpropan-1,3-diones with nitrostyrenes: one-step synthesis of 4-nitro-1,3-diarylbutan-1-ones
作者:ZHENG LI、HAO LU、ZHENRONG LIU、XIAOLONG MA
DOI:10.1007/s12039-019-1603-z
日期:2019.4
Abstract The sequential Michael addition/retro-Claisencondensation of 1,3-diarylpropan-1,3-diones with nitrostyrenes is described. 4-Nitro-1,3-diarylbutan-1-ones were efficiently synthesized in good to high yield under mild, transition-metal-free condition. This one-step method involving sequential carbon-carbon bond formation and cleavage provides a good alternative to the synthesis of various \(\gamma
Photodynamic treatment of melanoma cells using aza-dipyrromethenes as photosensitizers
作者:Kelly A. D. F. Castro、Letícia D. Costa、Samuel Guieu、Juliana C. Biazzotto、Maria Graça P. M. S. da Neves、M. Amparo F. Faustino、Roberto S. da Silva、Augusto C. Tomé
DOI:10.1039/d0pp00114g
日期:2020.7
In this study, we report for the first time the use of four aza-dipyrromethenes (ADPMs) as photosensitizers for cancer PDT. The synthesis and characterization of the ADPMs and their photodynamic action against B16F10 melanoma cells were assessed. ADPM 2 is the best singlet oxygen generator and the most photo-toxic (at 2.5 μM) towards B16F10 cells.
Copper(<scp>ii</scp>)-promoted oxidative C–H/C–H cross-coupling for rapid access to aza-BODIPY-indole derivatives with broad optical absorption
作者:Ruyong Jiang、Xiuguang Yang、Di Wu
DOI:10.1039/c7ob01344b
日期:——
The direct C–H activation of electron-deficient aza-BODIPYs has been effectively achieved via a concise and inexpensive Cu(II)-promoted oxidative C–H/C–H coupling approach. The resulting indole-aza-BODIPY 6b covers a broad spectrum of 429–900 nm with a FWHM of 294 nm in solution and covers a UV-vis-NIR region up to 1100 nm in film.
Highly Enantioselective Synthesis of γ-Nitro Heteroaromatic Ketones in a Doubly Stereocontrolled Manner Catalyzed by Bifunctional Thiourea Catalysts Based on Dehydroabietic Amine: A Doubly Stereocontrolled Approach to Pyrrolidine Carboxylic Acids
作者:Xianxing Jiang、Yifu Zhang、Albert S. C. Chan、Rui Wang
DOI:10.1021/ol8025268
日期:2009.1.1
class of dehydroabietic amine-substituted primary amine-thiourea bifunctional catalysts were designed and synthesized. The doubly stereocontrolled organocatalytic conjugateaddition of a variety of heterocycles-bearing ketones to nitroalkenes was investigated for the first time, affording (S)- or (R)-γ-nitro heteroaromatic ketones with excellent enantioselectivities (up to ee >99%). Furthermore, the nearly
Cinchona alkaloid-derived chiral bifunctional thiourea organocatalysts were synthesized and applied in the Michael addition between nitromethane and chalcones with high ee and chemical yields.