Photoredox and Copper Dual-Catalyzed Cyclization of Alkyne-tethered α-Bromocarbonyls.

The synergistic systems of photoredox and copper catalyst have already appeared as a novel formation of green synthetic chemistry, which open new avenues for chemical synthesis applications. We describe a novel strategy for the cyclization of alkyne-tethered α-bromocarbonyls initiated by the cleavage of C(sp )-Br bond via the collaboration of photoredox and copper catalyst. The present protocol exhibits mildness using economical copper catalyst and visible-light at room temperature.

Chemodivergent Tandem Radical Cyclization of Alkene-Substituted Quinazolinones: Rapid Access to Mono- and Di-Alkylated Ring-Fused Quinazolinones.

Chemodivergent tandem radical cyclization offers exciting possibilities for the synthesis of structurally diverse cyclic compounds. Herein, we revealed a chemodivergent tandem cyclization of alkene-substituted quinazolinones under metal- and base-free conditions, this transformation is initiated by alkyl radicals produced from oxidant-induced α-C(sp )-H functionalization of alkyl nitriles or esters. The reaction resulted in the selective synthesis of a series of mono- and di-alkylated ring-fused quinazolinones by modulating the loading of oxidant, reaction temperature, and reaction time.

Targeting cancer stem cell signature gene SMOC-2 Overcomes chemoresistance and inhibits cell proliferation of endometrial carcinoma.

Background: Endometrial cancer is one of the most common gynecological malignancies and has exhibited an increasing incidence rate in recent years. Cancer stem cells (CSCs), which are responsible for tumor growth and chemoresistance, have been confirmed in endometrial cancer. However, it is still challenging to identify endometrial cancer stem cells to then target for therapy.

E6/E7-P53-POU2F1-CTHRC1 axis promotes cervical cancer metastasis and activates Wnt/PCP pathway.

Cervical cancer is an infectious cancer and the most common gynecologic cancer worldwide. E6/E7, the early genes of the high-risk mucosal human papillomavirus type, play key roles in the carcinogenic process of cervical cancer. However, little was known about its roles in modulating tumor microenvironment, particular extracellular matrix (ECM).

[Characteristics of Microbial Nitrogen Degradation in Fluvo-aquic Soil of Hebei Plain].

Understanding the law of soil microbial degradation of nitrogen is of great practical significance for the remediation of soil nitrogen pollution. From fluvo-aquic soil of Hebei plain, 8 kinds of bacteria,including nitrification bacteria, ammonification bacteria, heterotrophic nitrification to aerobic denitrification bacteria were isolated and analyzed by 16S rDNA identification, and the most suitable strains were selected to prepare bacterial agents with optimized carrier materials. The effects of the screened strains of bacteria or antagonistic fungus to Chinese cabbage in the process of drip irrigation on nitrogen and PLFA (Phospholipid Fatty Acids) values in the soils were discussed.

Bioactive phenyl ether derivatives from the marine-derived fungus Aspergillus carneus.

A new phenyl ether derivative, 3-hydroxy-5-(3-hydroxy-5-methylphenoxy)-4-methoxybenzoic acid (1), along with two known analogues, 3,4-dihydroxy-5-(3-hydroxy-5-methylphenoxy)benzoic acid (2) and 3-hydroxy-5-(3-hydroxy-5-methylphenoxy)benzoic acid (3), were isolated from the fungus Aspergillus carneus collected from South China Sea. The structure elucidation of 1 was determined based on extensive NMR and MS spectroscopic analyses. Compound 2 showed a strong antioxidant activity with an IC value of 19.

A new quinolinone from freshwater lake-derived fungus Myrothecium verrucaria.

One new quinolinone, 7-hydroxy-3-methoxyviridicatin (1), along with eight known compounds (2-9) was isolated from the fungus Myrothecium verrucaria, which was collected from lake water of Chenghai, Yunnan Province, China. Their structures were elucidated by detailed analysis of spectroscopic data and comparison with related known compounds. Compounds 1 and 2 exhibited weak antibacterial activity.