Results 41 to 50 of about 46,609 (242)

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, Gabriel M. F. Batista, Pedro P. de Castro, Leonã S. Flores, Gustavo F. S. Andrade, Giovanni W. Amarante   +5 more
doaj   +1 more source

Diastereoselective Spiroannulation of Phenolic Derivatives: Effect of Steric Hindrance on the Diastereoselectivity

International Journal of Chemistry, 2011
This study was aimed at determining the effect, if any, that steric factors may have on the diastereoselectivity in the spiroannulation of simple phenols. A series of phenols bearing different size substituents ortho to the phenolic hydroxyl were synthesized and spiroannulated to the corresponding spiroethers in good to excellent yields (76-94 ...
Guy L. Plourde, Lyndia M. Susag
openaire   +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, Runjun Devi, Pallab Pahari, Bipul Sarma, Sajal Kumar Das   +4 more
doaj   +1 more source

Catalytic asymmetric synthesis of the alkaloid (+)-myrtine [PDF]

, 2008
A new protocol for the asymmetric synthesis of trans-2,6-disubstituted-4-piperidones has been developed using a catalytic enantioselective conjugate addition reaction in combination with a diastereoselective lithiation–substitution sequence; an efficient
Adriaan J. Minnaard, Albrow, Alexakis, Alexakis, Anderson, Bach, Back, Beak, Beak, Beak, Beak, Beak, Beak, Beak, Ben L. Feringa, Bennett, Bennett, Berkheij, Bertini Gross, Brooks, Comins, Comins, Comins, Comins, Comins, Comins, Comins, Curtin, d'Augustin, Davis, Dieter, Dieter, Dieter, Dieter, Dieter, Eilitz, Frankel, Fraser, Gallagher, Garcia-Ruiz, Gardette, Gelas-Mialhe, Hoffmann, Houk, Kerrick, King, Leclercq, Liang, Maria Gabriella Pizzuti, Pilli, Pilli, Pineschi, Pàmies, Remuson, Slosse, Slosse, Still, Tawara, Vuagnoux-d'Augustin, Vuagnoux-d'Augustin, Watson, Whisler, Šebesta   +62 more
core   +1 more source

Synthesis of Enantiopure Oxygen- and Nitrogen-Containing Heterocycles by Diastereoselective Ring-Closing Metathesis Reaction in Perhydro-1,3-benzoxazine Derivatives [PDF]

, 2019
Producción CientíficaDiastereoselective ring‐closing metathesis reactions on chiral trienic perhydro‐1,3‐benzoxazines derived from (−)‐8‐aminomenthol featuring two diastereotopic olefin chains is described.
Andrés Juan, Celia, Gutiérrez Loriente, Agustín, Martín Álvarez, José Miguel, Nieto Román, Francisco Javier, Prieto, Elena   +4 more
core   +2 more sources

ChemInform Abstract: Fluorine‐Directed Diastereoselective Iodocyclizations.

ChemInform, 2007
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Tredwell, M, Luft, J, Schuler, M, Tenza, K, Houk, K, Gouverneur, V   +5 more
openaire   +3 more sources

Synthesis of (3R,5R)-harzialactone A and its (3R,5S)-isomer

Beilstein Journal of Organic Chemistry, 2010
The total synthesis of (3R,5R)-harzialactone A (1) and its (3R,5S)-isomer (2) is described. Epoxide opening with thioacetal and diastereoselective reductions are used as key reactions.
Gowravaram Sabitha, Rangavajjula Srinivas, Sukant K. Das, Jhillu S. Yadav   +3 more
doaj   +1 more source

Stereoselective gridization and polygridization with centrosymmetric molecular packing

Nature Communications, 2020
Gridarenes with well-defined edges and vertices represent versatile nanoscale building blocks for installating frameworks but suffer from lack of stereoselective control during their synthesis. Here, the authors report a diastereoselective gridization of
Dongqing Lin, Ying Wei, Aizhong Peng, He Zhang, Chunxiao Zhong, Dan Lu, Hao Zhang, Xiangping Zheng, Lei Yang, Quanyou Feng, Linghai Xie, Wei Huang   +11 more
doaj   +1 more source

Concise Synthesis of (+)-allo-Kainic Acid via MgI2-Mediated Tandem Aziridine Ring Opening-Formal [3+2] Cycloaddition [PDF]

, 2013
3-Methyl vinyl aziridine undergoes a mild MgI2-promoted S(N)2' ring opening and concomitant cyclization with fumarate Michael acceptors to give trisubstituted pyrrolidines. The process is efficient and highly diastereoselective. This methodology has been
Aggarwal, Varinder K., Arena, Giada, Chen, Chia-Chun, Leonori, Daniele   +3 more
core   +1 more source

A diastereoselective approach to axially chiral biaryls via electrochemically enabled cyclization cascade

Beilstein Journal of Organic Chemistry, 2019
A diastereoselective approach to axially chiral imidazopyridine-containing biaryls has been developed. The reactions proceed through a radical cyclization cascade to construct the biaryls with good to excellent central-to-axial chirality transfer.
Hong Yan, Zhong-Yi Mao, Zhong-Wei Hou, Jinshuai Song, Hai-Chao Xu   +4 more
doaj   +1 more source