Results 51 to 60 of about 9,597,280 (150)

Iron(III)-Catalyzed Prins-Type Cyclization Using Homopropargylic Alcohol:  A Method for the Synthesis of 2-Alkyl-4-halo-5,6-dihydro-2H-pyrans

, 2016
A new Prins-type cyclization between homopropargylic alcohol and aldehydes in the presence of FeX3 to obtain 2-alkyl-4-halo-5,6-dihydro-2H-pyrans in good yield is described.
Pedro O. Miranda (2397970), Juan I. Padrón (2440633), Jaime Bermejo (2400757), David D. Díaz (2531212), Victor S. Martín (3037980)   +4 more
core   +1 more source

B-Alkyl Suzuki couplings for the stereoselective synthesis of substituted pyrans

, 2008
Unprotected homoallylic alcohols can be directly converted to cis-2,6-disubstituted pyrans by palladium catalyzed B-alkyl Suzuki coupling and subsequent Michael ...
Fürstner, A., O'Neil, G.
core   +2 more sources

Experimental and Quantum Chemical Calculations of 2-Amino-4,5,6,7-Tetrahydrobenzo[b]Thiophene-3-Carbonitrile

, 2017
Vibrational frequencies of 2-Amino-4,5,6,7-Tetrahydrobenzo[b]Thiophene-3-Carbonitrile were calculated using density functional (DFT/B3YLP) method with 6-311++G(d,p) basis set by Gaussian 09.
H. Oturak, N. Kaya Kinaytürk, Sert, Y., Y. Sert, Topuz, M., Talıp, P., Kaynaker, E., M.A. Topuz, E. Kaynaker, P. Talıp, Oturak, H., N. Kutlu, Kaya Kinaytürk, N., Kutlu, N.   +13 more
core   +1 more source

WELPSA: A natural catalyst of alkali and alkaline earth metals for the facile synthesis of tetrahydrobenzo[b]pyrans and pyrano[2,3-d]pyrimidinones as inhibitors of SARS-CoV-2. [PDF]

Appl Organomet Chem, 2022
Nesaragi AR, Kamble RR, Hoolageri SR, Mavazzan A, Madar SF, Anand A, Joshi SD.   +6 more
europepmc   +1 more source

Synthesis and Photochromic Properties of Methoxy Substituted 2,2-Diaryl-2H-naphtho[1,2-b]pyrans

, 2004
A series of methoxy-substituted 2,2-di(4-methoxyphenyl)-2H-naphtho[1,2-b]pyrans has been synthesised from 3-alkoxycarbonyl-1-naphthols and 1,1-di(4-methoxyphenyl)prop-2-yn-1-ol.
David A. Thomas, Christopher D. Gabbutt, Gabbutt, Christopher D., Kilner, Colin, B. Mark Heron, Hepworth, John D., Partington, Steven M., Heron, B. Mark, Thomas, David A., Colin Kilner, Steven M. Partington, John D. Hepworth   +11 more
core   +1 more source

α-Alkoxystannanes as masked oxonium ions: application to the synthesis of furo[2,3-b]pyrans

, 2006
α-Alkoxystannanes undergo oxidation upon treatment with cerium ammonium nitrate generating oxonium ions, which can be trapped in an intramolecular fashion affording furo[2,3-b]pyrans. © 2006 Elsevier Ltd.
Peter Quayle, Mills, Keith, Wang, Shouming, Gilbert, Philip S., Shouming Wang, Simon P. Thompson, Philip S. Gilbert, Michael R. Attwood, Lewis, Mark L., Thompson, Simon P., Attwood, Michael R., Quayle, Peter, Mark L. Lewis, Keith Mills   +13 more
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Merging Gold Catalysis and Bronsted Acid Catalysis for the Synthesis of Tetrahydrobenzo[b][1,8]naphthyridines

, 2018
A gold(I)/BrOnsted acid-catalyzed cyclization of 2-azidobenzaldehydes with 3-aza-1,6-enynes has been developed for the synthesis of tetrahydrobenzo[b][1,8]naphthyridine derivatives.
Wan, Boshun, Yi, Ruxia, Li, Xincheng
core   +1 more source

Silica-modified magnetite Fe₃O₄ nanoparticles grafted with sulfamic acid functional groups: an efficient heterogeneous catalyst for the synthesis of 3,4-dihydropyrimidin-2(1H)-one and tetrahydrobenzo[b]pyran derivatives

, 2016
Silica-modified magnetite-polyoxometalates functionalized with sulfamic acid groups as hybrid nanoparticles were prepared by sulfonation of diamine-functionalized propyl group grafted on the magnetic silica-coated Fe3O4 nanoparticles.
Omolbanin Badalkhani (2812741), Younes Abbasi (2590291), Davood Azarifar (806994)   +2 more
core   +1 more source

Graphene oxide supported ionic liquid/Fe complex: a robust and highly stable nanocatalyst. [PDF]

RSC Adv, 2023
Taheri K, Elhamifar D, Kargar S, Zarnegaryan A.   +3 more
europepmc   +1 more source

Reference Data 1H and 13C NMR chemical shift assignment of some 3H-naphtho [ 2,1-b ] pyrans

, 1999
International audienceThe 1H and 13C NMR resonances of four 3H-naphtho[2,1-b]pyrans were completely and unambiguously assigned by a combination of homonuclear (gs-COSY), 1H-detected heteronuclear one-bond (gs-HMQC) and long-range (gs-HMBC) gradient ...
Campredon, Mylene, `, Faure, Robert, Demadrille, Renaud, Giusti, Gerard, Campredon, Mylene,, Moustrou, Corinne   +5 more
core   +1 more source