Results 51 to 60 of about 21,746 (290)

Copper-catalyzed diastereo- and enantioselective desymmetrization of cyclopropenes: Synthesis of cyclopropylboronates [PDF]

, 2014
This document is the accepted manuscript version of a Published Work that appeared in final form in Journal of American Chemical Society 136.45, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the
Alejandro Parra, Alfaro R., Aurora López, Berman A. M., Bonet A., Bonet A., Carroll A. M., Chen D. Y.-K., Chen H., Corberán R., Crudden C. M., Didier D., Donaldson W. A., Doucet H., Fox J. M., Fujioka Y., He C., Imai T., Ito H., José Luis García Ruano, Krämer K., Laura Amenós, Lee K.-s., Lee Y., Liao L., Liskey C. W., Liu H., Liu X., Lohr S., Luithle J. E. A., Manuel Guisán-Ceinos, Marek I., Mariola Tortosa, Markó I. E., Masarwa A., Matsuda N., Matsuda N., Matteson D. S., Miki Y., Mun S., Nakamura M., Nakamura M., Noh D., Noh D., Phan D. H. T., Pietruszka J., Pietruszka J., Pietruszka J., Priestley E. S., Rubin M., Rubin M., Rubina M., Rubina M., Rucker R. P., Sakae R., Sherrill W. M., Simaan S., Simaan S., Tarwade V., Tortosa M., Utimoto K., Wessjohann L. A., Wu H., Yang Z., Yoo E. J., Zhong C., Zhou S.-M., Zhu S.   +67 more
core   +2 more sources

Transforming cyclopropanes to enamides via σ-C–C bond eliminative borylation

Nature Communications
Recent strides in C–H borylation have significantly expanded our toolkit for the preparation of organoboronates. Nevertheless, avenues alternative to obtain these compounds via σ-C–C cleavage, thereby facilitating molecular scaffold editing, remain ...
Shuyu Kang, Jiahang Lv, Tianhang Wang, Bingcheng Wu, Minyan Wang, Zhuangzhi Shi   +5 more
doaj   +1 more source

Cyclopropenes in Photochemical Reactions. [PDF]

Chemistry
The photochemical side of cyclopropenes. Cyclopropenes are valuable synthetic tools in organic chemistry. In particular, this review focuses on the photochemistry of cyclopropenes. The reactivity of cyclopropenes excited by irradiation is discussed showing their unique potential for organic synthesis.
Suárez-García D, Coto D, Vicente R.
europepmc   +2 more sources

Dirhodium(II)-catalyzed [3 + 2] cycloaddition of N-arylaminocyclopropane with alkyne derivatives

Beilstein Journal of Organic Chemistry, 2019
Dirhodium(II) complex-catalyzed [3 + 2] reactions between N-arylaminocyclopropanes and alkyne derivatives are described. The cycloaddition products proved to be versatile synthetic intermediates.
Wentong Liu, Yi Kuang, Zhifan Wang, Jin Zhu, Yuanhua Wang   +4 more
doaj   +1 more source

Enantioselective Gas Chromatographic Analysis of Cyclopropane Derivatives [PDF]

, 2018
Chirasil-β-Dex was used as chiral stationary phase for the enantioselective gas chromatographic analysis of several new chiral cyclopropane derivatives.
Aboul-Enein, H. Y., Ghanem, A., Grass, S., Jiang, Z., Lacrampe, F., Müller, P.   +5 more
core  

Visible-light photocatalytic intramolecular cyclopropane ring expansion [PDF]

, 2017
Described herein is a new visible-light photocatalytic strategy for the synthesis of enantioenriched dihydrofurans and cyclopentenes by an intramolecular nitro cyclopropane ring expansion reaction.
Amador, Bai, Barton, Blum, Borisov, Brand, Cavitt, Cheng, Demissie, Garve, Ivanova, Kaur, Luis-Barrera, Marenich, Narayanam, Prier, Romero, Sabbatani, Schneider, Schneider, Vesely, von Dreele, Wang, Xu, Yamaguchi, Zhang, Zhao, Zhu   +27 more
core   +2 more sources

Scalable synthesis of (1-cyclopropyl)cyclopropylamine hydrochloride

Beilstein Journal of Organic Chemistry, 2011
1-Cyclopropylcyclopropanecarboxylic acid (2), which is accessible on a large scale (900 mmol) from 1-bromo-1-cyclopropylcyclopropane (1) in 64% yield (89% on a 12.4 mmol scale), has been subjected to a Curtius degradation employing the Weinstock protocol
Sergei I. Kozhushkov, Alexander F. Khlebnikov, Rafael R. Kostikov, Dmitrii S. Yufit, Armin de Meijere   +4 more
doaj   +1 more source

An efficient synthesis of cycloalkane-1,3-dione-2-spirocyclopropanes from 1,3-cycloalkanediones using (1-aryl-2-bromoethyl)dimethylsulfonium bromides: application to a one-pot synthesis of tetrahydroindol-4(5H)-one [PDF]

, 2015
An efficient synthesis of cyclohexane- and cyclopentane-1,3-dione-2-spirocyclopropanes from 1,3-cycloalkanediones using sulfonium salts was achieved. The reaction of 1,3-cycloalkanediones with (1-aryl-2-bromoethyl)dimethylsulfonium bromides and powdered ...
Fukumoto Masahiro, Hirota Wataru, Nambu Hisanori, Ono Naoki, Yakura Takayuki   +4 more
core   +2 more sources

Intermolecular Enantioselective Nickel‐Catalyzed Arylation of Un‐Activated C(sp3)─H Bond

Angewandte Chemie International Edition, EarlyView.
Ni: a new solution for asymmetric C(sp3)─H activation. The stereoselective synthesis of all‐carbon quaternary stereogenic centres is achieved via enantioselective C(sp3)─H arylation using a Ni‐BINOL‐derived catalyst. Rational catalytic cycle design uncovers a new reaction pathway that can efficiently induce chiral information during the stereoselective
Erwan Brunard, Fengjie Huang, Àlex Díaz‐Jiménez, Sofiya Kostiukovska, Joanna Wencel‐Delord   +4 more
wiley   +1 more source

(2R,1'S,2'R)- and (2S,1'S,2'R)-3-[2-Mono(di,tri)fluoromethylcyclopropyl]alanines and their incorporation into hormaomycin analogues

Beilstein Journal of Organic Chemistry, 2014
Efficient and scalable syntheses of enantiomerically pure (2R,1'S,2'R)- and (2S,1'S,2'R)-3-[2-mono(di,tri)fluoromethylcyclopropyl]alanines 9a–c, as well as allo-D-threonine (4) and (2S,3R)-β-methylphenylalanine (3), using the Belokon' approach with (S ...
Armin de Meijere, Sergei I. Kozhushkov, Dmitrii S. Yufit, Christian Grosse, Marcel Kaiser, Vitaly A. Raev   +5 more
doaj   +1 more source