Results 61 to 70 of about 36,653 (344)

Development of a Vinylated Cyclic Allene: A Fleeting Strained Diene for the Diels–Alder Reaction

Angewandte Chemie, EarlyView.
A strain‐promoted Diels–Alder reaction of the vinylated cyclic allene, a highly reactive strained all‐carbon diene, was developed. Activation of the Kobayashi‐type precursor with fluoride ion generated the vinyl cyclic allene, which was trapped by dienophiles to produce decalin derivatives under mild conditions.
Haruki Mizoguchi, Takumi Obata, Taiki Hirai, Manaka Komatsu, Akira Sakakura   +4 more
wiley   +2 more sources

PECULIARITIES OF SEASON BIORHYTHMS IN DIFFERENT PARTS OF FUNCTIONAL SYSTEM MOTHER-PLACENTA-FETUS IN DEPENDENCE ON ITS STEREOFUNCTIONAL ORGANIZATION IN PHYSIOLOGICAL AND COMPLICATED PREGNANCY

Медицинский вестник Юга России, 2013
Purpose: studying seasonal periodicity of stereoisomerism of uteroplacental complex, the dynamics of body weight of infants, studying the chronostructure of mezorhythms of contractive activity of right and left parts of the uterus.Material and Methods ...
N. A. Rogova, T. L. Botasheva, A. V. Chernositov, L. V. Kaushanskaya, E. M. Alexandrova   +4 more
doaj   +1 more source

Glyptostrobus europaeus (Brongn.) Heer in Arkansas [PDF]

, 1970
Glyptostrobus europaeus (Brongn.) Heer, a fossil gymnosperm is found at a few locations in central North America, in deposits of the Eocene. This work cites previously reported localities and reports a new site at Hooker, Arkansas.
Wittlake, Eugene B.
core   +2 more sources

An evaluation of thermodynamic models for the prediction of drug and drug-like molecule solubility in organic solvents [PDF]

, 2011
Prediction of solubility of active pharmaceutical ingredients (API) in different solvents is one of the main issue for crystallization process design. Experimental determination is not always possible because of the small amount of product available in ...
Biscans, Béatrice, Bouillot, Baptiste, Teychené, Sébastien   +2 more
core   +1 more source

Synthesis of (−)‐8a‐epi‐Lentiginosine via Tsuji–Trost Reaction of d‐Glucose‐Derived Allylic Alcohols and Crystal Structure Analysis

Asian Journal of Organic Chemistry, EarlyView.
A facile synthetic route to (−)‐8a‐epi‐lentiginosine from d‐glucose using the Pd‐BiPhePhos catalyzed intramolecular Tsuji–Trost reaction of non−derivatized allylic alcohol as a key construction of the hydroxylated pyrrolidine ring is reported. The crystal structure of (−)‐8a‐epi‐lentiginosne showed the envelope conformation of the five‐membered ring ...
Sunisa Akkarasamiyo, Patchreenart Saparpakorn, Andreas Orthaber, Joseph S. M. Samec   +3 more
wiley   +1 more source

Is a Malleable Active Site Loop the Key to High Substrate Promiscuity? Hybrid, Biocatalytic Route to Structurally Diverse Taxoid Side Chains with Remarkable Dual Stereocontrol

Angewandte Chemie, EarlyView.
A highly stereoselective, dynamic reductive kinetic resolution (DYRKR) entry into myriad Taxotere‐like side chains with Clostridium acetobutylicum alcohol dehydrogenase (CaADH) enzyme is reported. Follow‐on cross couplings expand the structural diversity of the library (36 total examples).
Gaurav P. Kudalkar, Florian Leidner, Nivesh Kumar, Jared L. Hass, Peter Madzelan, Douglas R. Powell, Victor W. Day, Pierre Le Magueres, Joseph D. Ferrara, Lee M. Daniels, Akihito Yamano, Sho Ito, Wei Niu, Helmut Grubmüller, Mark A. Wilson, David B. Berkowitz   +15 more
wiley   +2 more sources

Self-Assembly, Adaptive Response, and in,out-Stereoisomerism of Large Orthoformate Cryptands [PDF]

, 2020
© 2020 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. We report on triethylene glycol-based orthoformate cryptands, which adapt their bridgehead configurations in response to metal templates and intramolecular hydrogen bonding in a complex
Delius, Max, Jäger, Christof M., Löw, Henrik, Mena-Osteritz, Elena, Mena‐Osteritz, Elena, Mullen, Kathleen M.   +5 more
core   +2 more sources

Ir‐Catalyzed Sulfur‐Directed Vinylic C─H Activation for the Stereoselective Synthesis of 1,3‐Dienes Using Alkynoates

Asian Journal of Organic Chemistry, EarlyView.
Ir‐catalyzed sulfur‐directed C─H alkenylation of alkynoates proceeded by using aryl methallyl sulfides. When DMAD was employed, 1,3‐dienes were initially formed and subsequently underwent thermal 1,5‐sigmatropic rearrangement to yield secondary products with high stereoselectivitiy.
Takanori Shibata, Haru Marumo
wiley   +1 more source

A new bonded silica based on an amino acid derivative as a TLC stationary phase to solve nitrophenol structural isomerism and ibuprofen stereoisomerism

Future Journal of Pharmaceutical Sciences, 2020
Background Many amino acids and their derivatives have been used previously as chiral selectors in thin layer chromatography. Herein, we reported the synthesis, characterization, and chromatographic evaluation of a new modified stationary phase based on (
Mouhammad Abu Rasheed, Ahmad Alshaghel, Amir Alhaj Sakur   +2 more
doaj   +1 more source

Bioorganic chemistry. Guides for the control-tests and exam [PDF]

, 2016
ХИМИЯ ОРГАНИЧЕСКАЯБИОЛОГИЯМАТЕРИАЛЫ К ЭКЗАМЕНУБИООРГАНИЧЕСКАЯ ХИМИЯРУКОВОДСТВАТЕСТОВЫЕ ЗАДАНИЯВ издании содержатся материалы для подготовки студентов к экзамену по биоорганической ...
Hidranovich, L. G., Hurynava, A. S., Khodos, O. A.   +2 more
core