Results 191 to 200 of about 140,419 (292)

The Reaction of 1-[o-Bromomethylphenyl]alkylidenemalonate, Cyanoacetate or Malononitrile with Azide Ion. Intramolecular 1,3-Dipolar Cycloaddition. [PDF]

, 1978
Per Kolsaker, Peter O. Ellingsen, Grete Wøien   +2 more
openalex   +1 more source

Total Synthesis of Dactyloquinone A and Spiroetherone A via a Metal‐Hydride Hydrogen Atom Transfer (MHAT) Process and a Quinol–Enedione Rearrangement

Angewandte Chemie, EarlyView.
Total syntheses of the meroterpenoid quinones dactyloquinone A and spiroetherone A were achieved from a common intermediate through the following original key steps: a metal‐hydride hydrogen atom transfer (MHAT) process with a quinone monoacetal in the case of dactyloquinone A, and a quinol–enedione rearrangement in the case of spiroetherone A ...
Guillaume Schoenn, Cyrille Kouklovsky, Régis Guillot, Thomas Magauer, Guillaume Vincent   +4 more
wiley   +2 more sources

Unprecedented “off‐pathway” [2+2] Cycloaddition‐Retroelectrocyclization Reaction Between an Unsymmetric Alkyne and Tetracyanoquinodimethane

Angewandte Chemie, EarlyView.
The widely used [2+2] cycloaddition‐retroelectrocyclization reaction between tetracyanoquinodimethane (TCNQ) and an activated alkyne has been shown to occur with “inverted” regiochemistry to give exclusive formation of an unexpected regioisomer. A combined experimental and theoretical study helped unravel the peculiar reaction mechanism underlying the ...
Oscar Fernández‐Vera, Luca Sagresti, Luis M. Mateo, Tomas Torres, Giuseppe Brancato, Giovanni Bottari   +5 more
wiley   +2 more sources

Facile N═N Bond Cleavage of Cis‐Azobenzene with Bis‐silylenes

Angewandte Chemie, EarlyView.
The unexpectedly easy N═N bond scission of cis‐azobenzene using two bis‐silylenes with different spacers and distinct SiII···SiII distances is reported. While both bis‐silylenes enable C─H and N═N π‐bond activation of trans‐azobenzene, the cooperative disilicon(II)‐mediated activation of cis‐azobenzene leads to bis‐silamines (Si═N) and related novel ...
Yun Xiong, Shenglai Yao, Matthias Driess
wiley   +2 more sources

Xanthopinacol Boronate: A Robust, Photochemically Assembled and Cleavable Boronic Ester for Orthogonal Chemistry

Angewandte Chemie, EarlyView.
Xanthopinacol (xpin) boronates are a conceptually new class of masked boronic acids designed to alleviate many of the disadvantages of pinacol esters and other popular adducts. They can be formed directly from xanthone and UV light, undergo orthogonal transformations, and are cleavable under photoredox catalysis or oxidative conditions that recycle ...
David M. Heard, Martin C. Lessard, Dennis G. Hall   +2 more
wiley   +2 more sources

Synthesis of thiopyran derivatives <i>via</i> [4 + 2] cycloaddition reactions. [PDF]

RSC Adv
Mousavi-Ebadia M, Safaei-Ghomi J, Nejad MJ.   +2 more
europepmc   +1 more source

Studies on the syntheses of tetracycline derivatives. II. Thermolytic cycloaddition of o-quinodimethanes with tetrahydronaphthoquinone and naphthoquinone.

, 1978
Tetsuji Kametani, Mitsuhiro Takeshita, Hideo Nemoto, Keiichiro Fukumoto   +3 more
openalex   +2 more sources

Michael Cycloaddition of 2-Phenylethene-1-sulfonamide with Carbon Disulfide [PDF]

, 1973
Kiyoshi Hasegawa, Tadashi Sasaki, Syuzi Hirooka   +2 more
openalex   +1 more source

Total Synthesis of Isodaphlongamine H by Iridium‐Catalyzed Reductive [3 + 2] Cycloaddition of N‐Hydroxylactam

Angewandte Chemie, EarlyView.
The total synthesis of isodaphlongamine H was accomplished by a lactam strategy. This strategy started with alkylation and N‐oxidation of a readily available chiral lactam. For the key functionalization of the amide carbonyl, an iridium‐catalyzed reductive [3 + 2] cycloaddition of the N‐hydroxylactam afforded the tricyclic isoxazolidine, which was ...
Sora Iwamoto, Reki Nakano, Keiji Sasaki, Shoichiro Kobayashi, Yuki Taira, Koya Takei, Reiji Kawakita, Ayako Tokuyama, Haruto Nakamura, Manato Tomoike, Ryota Kawahara, Akari Murase, Siro Simizu, Noritaka Chida, Toshitaka Okamura, Takaaki Sato   +15 more
wiley   +2 more sources

Enantioselective dearomative ortho-cycloaddition transformation of unactivated arenes by cage-confined visible-light photocatalysis. [PDF]

Nat Commun
Yang J, Li Z, Wu X, Chen J, Huang S, Lu YL, Jiao Z, Su CY.   +7 more
europepmc   +1 more source