Results 31 to 40 of about 6,084 (222)

A thermally-induced, tandem [3,3]-sigmatropic rearrangement/[2 + 2] cycloaddition approach to carbocyclic spirooxindoles

Beilstein Journal of Organic Chemistry, 2010
The synthesis of C3-carbocyclic spirooxindoles was realized by way of an intramolecular [2 + 2] cycloaddition reaction between a vinylidene indolin-2-one and an alkyne.
Kay M. Brummond, Joshua M. Osbourn
doaj   +1 more source

Enantioselective synthesis of (+)-petromyroxol, enabled by rhodium-catalyzed denitrogenation and rearrangement of a 1-sulfonyl-1,2,3-triazole [PDF]

, 2015
Petromyroxol is a non-racemic mixture of enantiomeric oxylipids isolated from water conditioned with larval sea lamprey. The (+)-antipode exhibits interesting biological properties but only 1 mg was isolated from >100000 L of water.
Boyer, Alistair
core   +2 more sources

Stereoselective protecting group free synthesis of d,l-gulose ethyl glycoside via multicomponent enyne cross metathesis—hetero Diels–Alder reaction [PDF]

, 2009
An efficient and stereoselective synthesis of d,l-gulose was described. The key step of the synthetic route is represented by a multicomponent enyne cross metathesis—hetero Diels–Alder reaction which allows the formation of the pyran ring from cheap and ...
Aoyagi, Boger, Boger, Bonini, Castagnolo, Chuit, Daniele Castagnolo, Dondoni, Furin, Giessert, Katano, Lorenzo Botta, Maimone, Maurizio Botta, Meyer zu Reckendorf, Minster, Petitou, Schaefer, Sinay, Takahashi, Tollefsen, Trachtenberg, Umezawa   +22 more
core   +1 more source

Mechanisms and Specificity of Phenazine Biosynthesis Protein PhzF

Scientific Reports, 2017
Phenazines are bacterial virulence and survival factors with important roles in infectious disease. PhzF catalyzes a key reaction in their biosynthesis by isomerizing (2 S,3 S)-2,3-dihydro-3-hydroxy anthranilate (DHHA) in two steps, a [1,5]-hydrogen ...
Christina Diederich, Mario Leypold, Martin Culka, Hansjörg Weber, Rolf Breinbauer, G. Matthias Ullmann, Wulf Blankenfeldt   +6 more
doaj   +1 more source

Understanding anionic Chugaev elimination in pericyclic tetracene formation [PDF]

, 2016
The reaction pathway for the formation of tetracenes from the diols 1,2-C6H4(CHOHC≡CAr)2 , LiHDMS, CS2 and MeI has been modelled by computational methods at the CBS-QB3 level of theory.
Albrow, Becke, Becke, Becke, Burroughs, Casian, Casian, Check, Chen, Chu, Dennington, Eyring, Frisch, Geacintov, Geary, Grimme, Gu, Hansch, Hirata, Jadhav, John Ritchie, Laurence Burroughs, Lee, Lin, Mamada, McGarry, Montgomery, Montgomery, Müller, Papagni, Pudzs, Redfern, Shao, Simon Woodward, Singh, Stephens, Swenberg, Thompson, Toshihiro Okamoto, Tritsch, Wu, Yagodkin, Yanai, Zhang, Zhao   +44 more
core   +2 more sources

Domino reaction of 3-nitro-2-(trifluoromethyl)-2H-chromenes with 2-(1-phenylalkylidene)malononitriles: Synthesis of functionalized 6-(trifluoromethyl)-6H-dibenzo[b,d]pyrans and a rare case of [1,5] sigmatropic shift of the nitro group [PDF]

, 2013
A variety of functionalized 6-(trifluoromethyl)-6H-dibenzo[b,d]pyrans were easily synthesized in good yields under mild conditions by a domino reaction of 3-nitro-2-(trifluoromethyl)-2H-chromenes with 2-(1-phenylethylidene)- and 2-(1-phenylpropylidene ...
Barkov, A. Y., Korotaev, V. Y., Sosnovskikh, V. Y.   +2 more
core   +1 more source

Intramolecular carbenoid ylide forming reactions of 2-diazo-3-keto-4-phthalimidocarboxylic esters derived from methionine and cysteine

Beilstein Journal of Organic Chemistry, 2012
Methionine, S-benzylcysteine and S-allylcysteine were converted into 2-diazo-3-oxo-4-phthalimidocarboxylic esters 8a–c in three steps. Upon rhodium-catalysed dediazoniation, two intramolecular carbenoid reactions competed, namely the formation of a ...
Marc Enßle, Stefan Buck, Roland Werz, Gerhard Maas   +3 more
doaj   +1 more source

Multistep self-assembly of heteroleptic magnesium and sodium-magnesium benzamidinate complexes [PDF]

, 2010
Reaction of the magnesium bis-alkyl Mg(CH2SiMe3)(2) and the sodium amide NaHMDS (where HMDS = N(SiMe3)(2)) with benzonitrile yields the homometallic heteroleptic complex [PhC(NSiMe3)(2)Mg{mu-NC(CH2SiMe3)Ph}](2) (1).
Forret, Robert, Kennedy, Alan R., Klett, Jan, Mulvey, Robert E., Robertson, Stuart D.   +4 more
core   +1 more source

Sigmatropic rearrangements in 5-allyloxytetrazoles [PDF]

, 2011
Mechanisms of thermal isomerization of allyl tetrazolyl ethers derived from the carbocyclic allylic alcohols cyclohex-2-enol and 3-methylcyclohex-2-enol and from the natural terpene alcohol nerol were investigated.
Abell, Abramovitch, Amin Ismael, Araújo, Araújo, Barkley, Basch, Becke, Bugalho, Bugalho, Cristiano, Cristiano, Cristiano, Cristiano, Daniela V. Coelho, Desarro, Dąbkowska, Frija, Frija, Frija, Frija, Frija, Frija, Frisch, Gu, Gómez-Zavaglia, Hashimoto, Head-Gordon, Igor Reva, Johnstone, Koldobskii, Lee, Luís M. T. Frija, M. Lurdes S. Cristiano, Mavromoustakos, McCarthy, Mishra, Pacios, Peng, Peng, Rui Fausto, Sandmann, Tamura, Toney   +43 more
core   +1 more source

Raman and nuclear magnetic resonance investigation of alkali metal vapor interaction with alkene-based anti-relaxation coating

, 2016
The use of anti-relaxation coatings in alkali vapor cells yields substantial performance improvements by reducing the probability of spin relaxation in wall collisions by several orders of magnitude.
Balabas M., D. Budker, Günther H., J. W. Blanchard, Jackson D. F., M. V. Balabas, Mistry B., O. Yu. Tretiak, P. K. Olshin, Robinson H., S. N. Smirnov, Socrates G., Woodward R. B.   +12 more
core   +1 more source