Results 31 to 40 of about 6,473 (220)
SynOpen, 2020 A diastereoselective approach to the synthesis of berkeleylactone F is presented. The synthetic strategy is initiated with commercially available (R)-glycidol, 1,6-heptadiyne, and (R)-(+)-methyl lactate.
Srijana Subba +2 more
doaj +1 more source
Advanced Science, EarlyView.A one‐step, asymmetric reductive coupling of alkynes and oxa‐ and aza‐bicyclic olefins using a cobalt/photoredox catalytic system through desymmetrization. ABSTRACT Bicyclo[2.2.1]heptane frameworks represent a privileged structural motif prevalent in numerous natural products and bioactive molecules.
Subhankar Pradhan +5 more
wiley +1 more source
Angewandte Chemie, EarlyView.A stereoselective functionalization method of cyclic imines under mild organocatalytic conditions was developed. Bifunctional cinchona alkaloid catalysts combined with carefully optimized reaction conditions to suppress background reactivity enabled highly enantio‐ and diastereoselective addition reactions of malonates to cyclic imines.
Frederic Kölblin, Helma Wennemers
wiley +2 more sources
ChemistryEuropeControlling the cross‐selectivity and diastereoselectivity in cross‐pinacol coupling reactions remains challenging. Herein, we report a redox‐neutral strategy that enables the cross‐selective pinacol coupling between pyridyl ketones and amine‐derived ...
Takahito Kuribara +3 more
doaj +1 more source
A Brønsted base-promoted diastereoselective dimerization of azlactones
Beilstein Journal of Organic Chemistry, 2017 A novel Brønsted base system for the diastereoselective dimerization of azlactones using trichloroacetate salts and acetonitrile has been developed. Desired products were obtained in good yields (60–93%) and with up to >19:1 dr after one hour of reaction.
Danielle L. J. Pinheiro +5 more
doaj +1 more source
Pd‐Catalyzed Asymmetric Dearomative Heck/Tsuji‐Trost Difunctionalization of Naphthalenes
Advanced Science, EarlyView.We have developed a palladium‐catalyzed asymmetric dearomative Heck/Tsuji‐Trost 1,4‐difunctionalization reaction of naphthalenes, affording 4‐aminospirocyclohexene oxindole products bearing two remote chiral centers. Through the effect of the newly designed chiral sulfinamide phosphine ligand with large steric hindrance, side reactions are inhibited ...
Long‐Ling Ma +3 more
wiley +1 more source
Cobalt‐Catalyzed Radical Ligand Transfer (RLT) Enables Remote‐Markovnikov Hydroamination of Alkenes
Angewandte Chemie, EarlyView.A cobalt‐catalyzed remote‐Markovnikov 1,3‐hydroamination of allyl carboxylates proceeds through MHAT, 1,2‐radical acyloxy migration (1,2‐RAM), and radical ligand transfer (RLT) from a Co‐N intermediate, providing protected amino alcohols. ABSTRACT Amino alcohols are prevalent in pharmaceuticals, agrochemicals, and functional materials, yet ...
Arman Khosravi +7 more
wiley +2 more sources
cis-Diastereoselective synthesis of chroman-fused tetralins as B-ring-modified analogues of brazilin
Beilstein Journal of Organic Chemistry, 2016 We have synthesized a series of cis-6a,7,8,12b-tetrahydro-6H-naphtho[2,1-c]chromen-6a-ols as B-ring-modified analogues of (±)-brazilin. A completely regio- and cis-diastereoselective intramolecular Friedel–Crafts epoxy–arene cyclization of 1-tetralone ...
Dimpee Gogoi +4 more
doaj +1 more source
Advanced Science, EarlyView.Stereochemistry enables control of ion‐exchange membrane properties via local backbone flexibility without altering the polymer composition. Syn‐enriched membranes show higher water uptake and improved water‐electrolysis performance, whereas anti‐enriched membranes exhibit higher hydration efficiency and improved mechanical properties.
Si Chen +3 more
wiley +1 more source
Diastereoselective Intramolecular Cyanoamidation with Alkenes [PDF]
European Journal of Organic Chemistry, 2016 Reported herein is a diastereoselective intramolecular alkene cyanoamidation, wherein high d.r. values are imparted by chiral directing groups. Lactams with an α‐all‐carbon quaternary stereocenter are readily synthesized, which may enable access to structures frequently found in biologically active molecules and natural products.
Ashley M. Dreis +5 more
openaire +2 more sources