Results 41 to 50 of about 11,460 (224)

Re2O7-catalyzed reaction of hemiacetals and aldehydes with O-, S-, and C-nucleophiles

Beilstein Journal of Organic Chemistry, 2013
Re(VII) oxides catalyze the acetalization, monoperoxyacetalization, monothioacetalization and allylation of hemiacetals. The reactions, which take place under mild conditions and at low catalyst loadings, can be conducted using hemiacetals, the ...
Wantanee Sittiwong, Michael W. Richardson, Charles E. Schiaffo, Thomas J. Fisher, Patrick H. Dussault   +4 more
doaj   +1 more source

Asymmetric Decarboxylative Allylation of Oxindoles

, 2011
An asymmetric decarboxylative palladium-catalyzed allylation of alkyl- and aryl-substituted oxindoles has been developed, enabling the installation of an all-carbon quaternary chiral center at the oxindole 3-position in excellent yields and good to ...
Franckevicius, Vilius, Taylor, Richard J. K., Pickworth, Mark, Cuthbertson, James D., Pugh, David S.   +4 more
core   +5 more sources

Palladium-Catalyzed Allylation/Benzylation of H-Phosphinate Esters with Alcohols

Molecules, 2016
The Pd-catalyzed direct alkylation of H-phosphinic acids and hypophosphorous acid with allylic/benzylic alcohols has been described previously. Here, the extension of this methodology to H-phosphinate esters is presented. The new reaction appears general,
Anthony Fers-Lidou, Olivier Berger, Jean-Luc Montchamp   +2 more
doaj   +1 more source

Stereospecific Decarboxylative Allylation of Sulfones

, 2016
Allyl sulfonylacetic esters undergo highly stereospecific, palladium-catalyzed decarboxylative allylation. The reaction allows the stereospecific formation of tertiary homoallylic sulfones in high yield.
Being J. Ka (2268721), Jon A. Tunge (1330908), Jimmie D. Weaver (1666147), David K. Morris (2268718), Ward Thompson (2268724)   +4 more
core   +3 more sources

Enzymatic Allylation of Catechols

, 2015
Enzymatic allylation of catechols was realized via catechol O-methyltransferase (COMT) using an allylated S-adenosyl-L-methionine (allyl-SAM) analog, with relatively good chemo- and regioselectivities.
Liu, Yuxue, Sohai, Muhammad, Zhao, Zongbao K., Zhang, Yixin, Wang, Xueying, Liu, Wujun   +5 more
core   +1 more source

Boron-Catalyzed, Diastereo- and Enantioselective Allylation of Ketones with Allenes [PDF]

, 2022
The diastereo- and enantioselective allylation of ketones remains a synthetic challenge, with transition metal catalysis offering the most applied methods. Here, a boron-catalyzed allylation of ketones with allenes is presented.
Willcox, Dominic R.; id_orcid, Yuxuan Peng, Stephen P. Thomas, Llopis, Natalia, Dominic R. Willcox, Gary S. Nichol, Willcox, Dominic R., Alejandro Baeza, Peng, Yuxuan, Nicholson, Kieran, Kieran Nicholson, Thomas Langer, Langer, Thomas, Natalia Llopis, Nichol, Gary S., Thomas, Stephen P., Baeza, Alejandro   +16 more
core   +1 more source

Design and synthesis of propellane derivatives and oxa-bowls via ring-rearrangement metathesis as a key step

Beilstein Journal of Organic Chemistry, 2015
Various intricate propellane derivatives and oxa-bowls have been synthesized via a ring-rearrangement metathesis (RRM) as a key step starting from readily accessible starting materials such as p-benzoquinone, 1,4-naphthoquinone and 1,4-anthraquinone.
Sambasivarao Kotha, Rama Gunta
doaj   +1 more source

Chiral Diol-Based Organocatalysts in Enantioselective Reactions

Molecules, 2018
Organocatalysis has emerged as a powerful synthetic tool in organic chemistry in the last few decades. Among various classes of organocatalysis, chiral diol-based scaffolds, such as BINOLs, VANOLs, and tartaric acid derivatives, have been widely used to ...
Truong N. Nguyen, Po-An Chen, Krit Setthakarn, Jeremy A. May   +3 more
doaj   +1 more source

Base-Controlled Regiospecific Mono-Benzylation/Allylation and Diallylation of 4-Aryl-5-indolyl-1,2,4-triazole-3-thione: Thio-Aza Allyl Rearrangement

Crystals, 2023
The regiospecific S-benzylation/allylation of two 4-aryl-5-indolyl-1,2,4-triazole-3-thione precursors was carried out using Et3N as a base. Allyl group migration from exocyclic sulfur to the triazole nitrogen (N3) was successfully achieved in a short ...
Eid E. Salama, Mohamed F. Youssef, Ahmed T. A. Boraei, Matti Haukka, Saied M. Soliman, Assem Barakat, Ahmed A. M. Sarhan   +6 more
doaj   +1 more source

Copper-Catalyzed Enantioselective Allyl–Allyl Cross-Coupling [PDF]

Journal of the American Chemical Society, 2013
A Cu(I)-phosphoramidite-based catalytic system that allows asymmetric allyl-allyl cross-coupling with high enantioselectivity is reported. This transformation tolerates a large variety of functionalized substrates. The versatility of this new reaction is illustrated in the catalytic asymmetric synthesis of the Martinelline alkaloids chromene derivative
Hornillos, Valentin, Perez, Manuel, Fananas-Mastral, Martin, Feringa, Ben L.   +3 more
openaire   +2 more sources