Results 181 to 190 of about 3,273,294 (390)

Enantioselective Total Synthesis of (−)‐Diversonol

open access: yesChemistry – A European Journal, 2013
AbstractFor the synthesis of (−)‐diversonol (ent‐1), an enantioselective domino‐Wacker/carbonylation/methoxylation reaction and an enantioselective Wacker oxidation were used to give the chroman in high yield and 96 % and 93 % ee, respectively. Dihydroxylation at the vinyl moiety using the Sharpless procedure and a Wittig–Horner reaction followed by ...
Tietze, Lutz Friedjan   +5 more
openaire   +4 more sources

Organocatalytic atroposelective construction of axially chiral arylquinones

open access: yesNature Communications, 2019
Axially chiral compounds have widespread use in asymmetric catalysis. Here, the authors disclose a highly enantioselective synthesis of axially chiral o-naphthoquinones by chiral phosphoric acid catalysis and central-to-axial chirality conversion.
Shuai Zhu   +8 more
doaj   +1 more source

Enantioselective Synthesis of Sulfinamidines via Asymmetric Nitrogen Transfer from N−H Oxaziridines to Sulfenamides [PDF]

open access: yes
Sulfinamidines are promising aza-SIV chiral building blocks in asymmetric synthesis and drug discovery. However, no report has documented their enantioselective synthesis.
Fimm, Marc, Saito, Fumito
core   +1 more source

Enantioselective synthesis of (R)‐ and (S)‐2‐methyl‐[3,3,2‐2H3] alanines [PDF]

open access: green, 1986
Pullachipatti K. Subramanian   +1 more
openalex   +1 more source

Asymmetric total synthesis of smyrindiol employing an organocatalytic aldol key step

open access: yesBeilstein Journal of Organic Chemistry, 2012
The first organocatalytic asymmetric synthesis of smyrindiol, by using an (S)-proline catalyzed enantioselective intramolecular aldol reaction as the key step, is described. Smyrindiol was synthesized from commercially available 2,4-dihydroxybenzaldehyde
Dieter Enders   +3 more
doaj   +1 more source

Enantioselective Total Synthesis of (—)-Acetylaranotin, a Dihydrooxepine Epidithiodiketopiperazine [PDF]

open access: yes, 2012
The first total synthesis of the dihydrooxepine-containing epidithiodiketopiperazine (ETP) (−)-acetylaranotin (1) is reported. The key steps of the synthesis include an enantioselective azomethine ylide (1,3)-dipolar cycloaddition reaction to set the ...
Codelli, Julian A.   +2 more
core   +1 more source

Enantioselective Catalysis for Agrochemicals: The Case History of the DUAL MAGNUM® Herbicide

open access: yesCHIMIA, 1997
The use of enantioselective catalytic methods for the technical preparation of chiral agrochemicals is illustrated by the case history of the herbicide (S)-merolachlor (trade name DUAL MAGNUM®).
Hans-Ulrich Blaser, Felix Spindler
doaj   +2 more sources

Catalytic Asymmetric Cyclizative Rearrangement of Anilines and Vicinal Diketones to Access 2,2‐Disubstituted Indolin‐3‐ones

open access: yesAdvanced Science
The efficient synthesis of chiral 2,2‐disubstituted indolin‐3‐ones is of great importance due to its significant synthetic and biological applications. However, catalytic enantioselective methods for de novo synthesis of such heterocycles remain scarce ...
Rui Quan   +4 more
doaj   +1 more source

Organocatalytic tandem Michael addition reactions: A powerful access to the enantioselective synthesis of functionalized chromenes, thiochromenes and 1,2-dihydroquinolines

open access: yesBeilstein Journal of Organic Chemistry, 2012
Enantioselective organocatalysis has become a field of central importance within asymmetric chemical synthesis and appears to be efficient approach toward the construction of complex chiral molecules from simple achiral materials in one-pot ...
Chittaranjan Bhanja   +3 more
doaj   +1 more source

Palladium-Catalyzed Asymmetric Conjugate Addition of Arylboronic Acids to Five-, Six-, and Seven-Membered β-Substituted Cyclic Enones: Enantioselective Construction of All-Carbon Quaternary Stereocenters [PDF]

open access: yes, 2011
The first enantioselective Pd-catalyzed construction of all-carbon quaternary stereocenters via 1,4-addition of arylboronic acids to β-substituted cyclic enones is reported. Reaction of a wide range of arylboronic acids and cyclic enones using a catalyst
Gatti, Michele   +3 more
core   +1 more source

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