نتایج جستجو برای: diastereoselectivity

تعداد نتایج: 565  

Journal: :The Journal of organic chemistry 2005
Abijah M Nyong Jon D Rainier

The Rh(II)-catalyzed coupling of chiral 2-thiopyranylindoles with vinyl diazoacetates results in the generation of indolines having quaternary substitution at C3 in high diastereoselectivity.

Journal: :Chemical communications 2012
Dongdong Wu Lei Wang Kai Xu Jia Song Hoong-Kun Fun Jianhua Xu Yan Zhang

Starting from readily available phenanthrenequinone and alkenes, biaryl containing medium-ring bislactones could be easily prepared through sequential photocycloaddition-photooxidation reactions with good yields and diastereoselectivity.

Journal: :Chemical communications 2014
Lin Qiu Xin Guo Chaoqun Ma Huang Qiu Shunying Liu Liping Yang Wenhao Hu

Four-component Mannich reactions subsequently followed by an intramolecular oxo-Michael addition were developed to efficiently produce chiral cyclic acetals with high diastereoselectivity and enantioselectivity.

2011
Asok K. Mallik Tapas K. Mandal Rammohan Pal Amarendra Patra

Iodine-catalyzed cyclocondensation of cinnamaldehyde and thiophenol yields rapidly trans-2-phenyl-4-thiophenoxy-3,4-dihydro-2H-1-benzothiopyran in excellent yield with very high diastereoselectivity.

Journal: :Organic & biomolecular chemistry 2012
David J Aitken Angela M Bernard Francesca Capitta Angelo Frongia Régis Guillot Jean Ollivier Pier Paolo Piras Francesco Secci Marco Spiga

N-Phenylsulfonyl (S)-proline catalyzes the direct aldol reaction of 3-substituted cyclobutanones and aryl aldehydes in good yield and with excellent diastereoselectivity and enantioselectivity. This desymmetrization process provides highly functionalized cyclobutanones with control over three contiguous stereogenic centers.

Journal: :Organic & biomolecular chemistry 2010
Ritwik Burai Chinnasamy Ramesh Marvin Shorty Ramona Curpan Cristian Bologa Larry A Sklar Tudor Oprea Eric R Prossnitz Jeffrey B Arterburn

The GPR30 agonist probe G-1 and structural analogs were efficiently synthesized using multicomponent or stepwise Sc(III)-catalyzed aza-Diels-Alder cyclization. Optimization of solvent and reaction temperature provided enhanced endo-diastereoselectivity.

Journal: :Chemical communications 2014
P Veeraraghavan Ramachandran Daniel R Nicponski

An auto-catalytic domino reaction, presumably involving an aza-Michael reaction, proton transfer, and lactonization, furnishing α-(aminomethyl)-γ-butyrolactones in near quantitative yields and excellent diastereoselectivity is described.

Journal: :Organic & biomolecular chemistry 2011
Chengmei Huang Haitao Yu Zhengrui Miao Jie Zhou Shuai Wang Hoong-Kun Fun Jianhua Xu Yan Zhang

Photocycloaddition of isoquinoline-1,3,4-trione and 5-methoxyoxazoles affords spiroisoquinolineoxetanes with high regio- and diastereoselectivity. The spiroisoquinolineoxetanes can be conveniently converted into novel spiroisoquinolineoxazoline derivatives through acid catalyzed sequential reactions.

2010
A. Bouraiou A. Debache S. Rhouati A. Belfaitah N. Benali-Cherif B. Carboni

N-Metallated azomethine ylide generated from methyl (E)-N-benzylideneglycinate, LiBr and triethylamine underwent cycloaddition to quinolyl , -unsaturated ketones with excellent diastereoselectivity to afford new functionalised 3-pyrrolidinylquinoline derivatives.

2015
Xinfang Xu Yongming Deng David N. Yim Peter Y. Zavalij Michael P. Doyle

β-Lactam derivatives are produced through intermediate donor-acceptor cyclopropene intermediates in high yield, exclusive cis-diastereoselectivity, and high enantiocontrol in a chiral dirhodium carboxylate catalyzed intramolecular C-H functionalization reaction of enoldiazoacetamides.

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