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9 results on '"Jun Ren"'

1. Studies toward the Total Syntheses of Calyciphylline D-Type Daphniphyllum Alkaloids

Author

Yi Cui, Zhongwen Wang, Jiayuan Lv, and Jun Ren

Subjects
chemistry.chemical_compound, biology, chemistry, Cyclopropanation, Stereochemistry, Organic Chemistry, Physical and Theoretical Chemistry, biology.organism_classification, Biochemistry, Daphniphyllum, Calyciphylline D, Octane
Abstract

An efficient construction of an aza-[5.7.6.5] tetracyclic core structure of calyciphylline D-type Daphniphyllum alkaloids has been achieved. The synthetic route features a diastereoselective cyclopropanation, efficient construction of the core bridged 8-aza-[3.2.1]octane skeleton through a [3 + 2] IMCC strategy, oxidative dearomatization of phenol, and gram-scale preparation in each step.

Published
2021

2. Lewis Acid Catalyzed Intramolecular [3 + 2] Cross Cycloadditions of Cobalt-Alkynylcyclopropane 1,1-Diesters with Carbonyls for Construction of Medium-Sized and Polycyclic Skeletons

Author

Zhongwen Wang, Shende Jiang, Junhui Zhang, Siyang Xing, and Jun Ren

Subjects
Cyclopropanes, Cycloaddition Reaction, Molecular Structure, Organic Chemistry, chemistry.chemical_element, Cobalt, Biochemistry, Catalysis, Cycloaddition, chemistry, Alkynes, Intramolecular force, Polymer chemistry, Organic chemistry, Molecule, Moiety, Polycyclic Compounds, Lewis acids and bases, Physical and Theoretical Chemistry, Lewis Acids
Abstract

A Lewis acid catalyzed intramolecular [3 + 2] cross cycloaddition of cobalt-alkynylcyclopropane 1,1-diesters with carbonyls has been successfully developed. Together with simple and efficient postcycloadditions of the cobalt-alkyne moiety, a general and efficient strategy for construction of structurally complex and diverse medium-sized skeletons and related polycycles was supplied successfully.

Published
2014

3. Lewis Acids Promoted Formal Intramolecular [3 + 2] Parallel and Cross-Cycloadditions of Cyclopropane 1,1-Diesters with Allenes

Author

Zhenjun Wang, Zhongwen Wang, and Jun Ren

Subjects
Cyclopropanes, Cycloaddition Reaction, Molecular Structure, Stereochemistry, Organic Chemistry, Esters, Stereoisomerism, Alkenes, Crystallography, X-Ray, Biochemistry, Catalysis, Cycloaddition, Cyclopropane, chemistry.chemical_compound, chemistry, Intramolecular force, Lewis acids and bases, Physical and Theoretical Chemistry, Nonane, Lewis Acids, Octane
Abstract

A novel Lewis acid promoted formal intramolecular [3 + 2] parallel/cross-cycloaddition of cyclopropane 1,1-diesters with allenes has been successfully developed, in which the two C═C of allenes were involved respectively. This provides a general and efficient strategy for the construction of structurally diverse [4.3.0]nonane and [3.2.1]octane skeletons.

Published
2013

4. Lewis Acid Catalyzed Formal Intramolecular [3 + 3] Cross-Cycloaddition of Cyclopropane 1,1-Diesters for Construction of Benzobicyclo[2.2.2]octane Skeletons

Author

Jun Ren, Weiwei Ma, Jie Fang, and Zhongwen Wang

Subjects
Cyclopropanes, Bicyclic molecule, Cycloaddition Reaction, Molecular Structure, Stereochemistry, Organic Chemistry, Stereoisomerism, Biochemistry, Cycloaddition, Catalysis, Cyclopropane, chemistry.chemical_compound, Bridged Bicyclo Compounds, chemistry, Intramolecular force, Lewis acids and bases, Physical and Theoretical Chemistry, Octane, Lewis Acids
Abstract

A novel Lewis acid catalyzed formal intramolecular [3 + 3] cross-cycloaddition (IMCC) of cyclopropane 1,1-diesters has been successfully developed. This supplies an efficient and conceptually new strategy for construction of bridged bicyclo[2.2.2]octane skeletons. This [3 + 3]IMCC could be run up to gram scale and from easily prepared starting materials. This [3 + 3]IMCC, together with our previously reported [3 + 2]IMCC strategy, can afford either the bicyclo[2.2.2]octane or bicyclo[3.2.1]octane skeletons from the similar starting materials by regulating the substituents on vinyl group.

Published
2015

5. Cooperative Photo-/Lewis Acid Catalyzed Tandem Intramolecular [3 + 2] Cross-Cycloadditions of Cyclopropane 1,1-Diesters with α,β-Unsaturated Carbonyls for Medium-Sized Carbocycles

Author

Zhongwen Wang, Shuai Chen, Jun Ren, and Zhenjun Wang

Subjects
chemistry.chemical_compound, Tandem, chemistry, Intramolecular force, Organic Chemistry, Organic chemistry, Lewis acids and bases, Physical and Theoretical Chemistry, Biochemistry, Medicinal chemistry, Isomerization, Catalysis, Cyclopropane
Abstract

A tandem isomerization/intramolecular [3 + 2] cross-cycloaddition (IMCC) of cyclopropane 1,1-diesters with α,β-unsaturated ketones/aldehydes under a cooperative catalysis of photo and Lewis acids has been successfully developed. This supplied a general and efficient strategy for construction of medium-sized carbocyclic (8-, 9-, and 10-membered) skeletons as well as such carbocycle-based bridged oxa-bicyclo[n.2.1] (n = 4-6) skeletons.

Published
2015

6. A Light-Driven Rotaxane Molecular Shuttle with Dual Fluorescence Addresses

Author

Da-Hui Qu, Qiaochun Wang, He Tian, and Jun Ren

Subjects
Dual fluorescence, chemistry.chemical_compound, Rotaxane, Molecular shuttle, Photoisomerization, Azobenzene, chemistry, Organic Chemistry, Light driven, Physical and Theoretical Chemistry, Photochemistry, Biochemistry, Fluorescence
Abstract

[reaction: see text] A molecular shuttle containing an alpha-CD macrocycle, an azobenzene unit, and two different fluorescent naphthalimide units was synthesized. The cis-trans photoisomerization of the azobenzene unit resulted in the motion of the CD macrocycle on the track. Because of the easy regulation and full reversibility of the fluorescence change of the two stopper units, the molecular shuttle could be used as a molecular storage medium or switch with all-optical inputs and outputs.

Published
2004

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