Results 31 to 40 of about 5,737 (220)

Incredible Role of Glycerol in Multicomponent Synthesis of 2,3-Dihydroquinazoline-4(1H)-ones and 1-Amidoalkyl-2-naphthols

Croatica Chemica Acta, 2015
An efficient and green synthesis of 1-amidoalkyl-2-naphthols via one-pot three-component condensation of aromatic aldehydes, acetamide and 2-naphthol in the presence of catalytic amounts of glycerosulfonic acid in glycerol as a green solvent was ...
Maryam Hajjami, Fariba Bakhti, Elahe Ghiasbeygi   +2 more
doaj   +1 more source

Photocatalytic Cross‐Coupling of Phenols and Heteroaryl Halides With Machine Learning‐Guided Reaction Prediction

Angewandte Chemie, EarlyView.
Photocatalytic cross‐coupling: A redox‐neutral photochemical method enables direct C(sp2)─C(sp2) bond formation between phenols and heteroaryl halides using an organic dye and base. Complementary radical generation allows efficient cross‐coupling in up to 91% yield. Mechanistic studies, DFT, HTE, and machine learning rationalize and predict reactivity,
Matthew C. Carson, Alice Wu, Kalyana B. Duggal, Madeline E. Rotella, Marisa C. Kozlowski   +4 more
wiley   +2 more sources

A Simple and Effective Protocol for the Pechmann Reaction to Obtain 4-Methylcoumarin Derivatives Using a High-Speed Mixer Ball Mill Process

Chemistry, 2023
We hereby report a simple and efficient method for the preparation of 4-methylcoumarins series, including Coumarin 120 (7-amino-4-methylcoumarin) from phenols (or naphthols) and ethyl acetoacetate in the presence of 3 mol% InCl3.
Silvia J. Becerra-Anaya, Diego R. Merchán Arenas, Vladimir V. Kouznetsov   +2 more
doaj   +1 more source

Urinary naphthalene and phenanthrene as biomarkers of occupational exposure to polycyclic aromatic hydrocarbons. [PDF]

, 2008
OBJECTIVES: The study investigated the utility of unmetabolised naphthalene (Nap) and phenanthrene (Phe) in urine as surrogates for exposures to mixtures of polycyclic aromatic hydrocarbons (PAHs).
Garshick, E, Hart, J. E., Herrick, R. F., Laden, F., McClean, M. D., Rappaport, S. M., Smith, T. J., Sobus, J. R., Waidyanatha, S., Zheng, Y.   +9 more
core   +3 more sources

Transition-Metal-Free [3+2] Dehydration Cycloaddition of Donor-Acceptor Cyclopropanes With 2-Naphthols

Frontiers in Chemistry, 2021
A Brønsted acid-catalyzed domino ring-opening cyclization transformation of donor-acceptor (D-A) cyclopropanes and 2-naphthols has been developed.
Hua Zhao, Peng Shen, Dongru Sun, Hongbin Zhai, Yufen Zhao   +4 more
doaj   +1 more source

Asymmetric synthesis of gonytolide A: strategic use of an aryl halide blocking group for oxidative coupling [PDF]

, 2018
The first synthesis of the chromanone lactone dimer gonytolide A has been achieved employing vanadium(V)-mediated oxidative coupling of the monomer gonytolide C. An o-bromine blocking group strategy was employed to favor para- para coupling and to enable
Iwata, Takayuki, Porco, John A., Qin, Tian, Reichl, Kyle D., Scharf, Adam, Wu, Xiaowei   +5 more
core   +1 more source

Urinary 1-Hydroxypyrene Levels in Workers Exposed to Polycyclic Aromatic Hydrocarbon from Rubber Wood Burning [PDF]

, 2014
BackgroundUrinary 1-hydroxypyrene (1-OHP) was selected as a biomarker of polycyclic aromatic hydrocarbons (PAHs) to explore the accumulation level in the bodies of workers at rubber smoke sheet factories in southern Thailand.MethodsSpot urine samples ...
Berkhout, J J, Helmich, Esther, Jaarsma, A. D. C., Slootweg, I. A., Teunissen, P W, van der Vleuten, C. P. M.   +5 more
core   +4 more sources

Three-component domino reaction in Triton B: A facile synthesis of 4H-chromene derivatives

Results in Chemistry, 2023
Herein, we report an unprecedented one-pot domino synthesis of indole- or naphthol-tethered biologically relevant 4H-chromene derivatives from readily accessible salicylaldehydes, malononitrile, and indoles/β-naphthols employing efficient, inexpensive ...
Mrinal Talukdar, Nasreen Islam, Eeshwaraiah Begari   +2 more
doaj   +1 more source

Total Syntheses of HMP-Y1, Hibarimicinone, and HMP-P1 [PDF]

, 2012
Total syntheses of HMP-Y1, atrop-HMP-Y1, hibarimicinone, atrop-hibarimicinone, and HMP-P1 are described using a two-directional synthesis strategy. A novel benzyl fluoride Michael–Claisen reaction sequence was developed to construct the complete carbon ...
Liau, Brian Bor-Jen, Milgram, Benjamin Charles, Shair, Matthew David   +2 more
core   +1 more source

Organocatalytic Enantioselective Friedel-Crafts Aminoalkylation of Indoles in the Carbocyclic Ring [PDF]

, 2016
The first general catalytic method for the, so far elusive, enantioselective Friedel−Crafts functionalization of indoles in the carbocyclic ring is presented.
Blay Llinares, Gonzalo, Fernández Picot, Isabel, Montesinos Magraner, Marc, Muñoz, M. Carmen, Pedro, José Ramón, Rendón-Patiño, Alejandra, Vila Descals, Carlos   +6 more
core   +6 more sources