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Your search keyword '"Song, Le"' showing total 3 results
Start Over Author "Song, Le" Journal advanced synthesis & catalysis
3 results on '"Song, Le"'

1. Construction of Fused‐oxa‐[n.2.1] Skeletons by Tandem Intramolecular [3+2] Cycloaddition/O‐H Insertion/Ester Exchange of Cyclopropanes with Diazocarbonyls.

Author

Xia, Miao‐Miao, Song, Le‐Le, Li, Feng‐Xing, Hou, Yan‐Ni, Shi, Zi‐Fa, and Cao, Xiao‐Ping

Subjects
*SKELETON, *LEWIS acids, *ESTERS, *EXCHANGE, *CONSTRUCTION, *CYCLOPROPANE derivatives
Abstract

A Lewis acid promoted tandem reaction of intramolecular [3+2] cycloaddition/O−H insertion/ester exchange of cyclopropanes with diazocarbonyls is reported to synthesize fused‐oxa‐[n.2.1] skeletons, which tolerates both aryl and alkyl diazocarbonyl substrates. A wide variety of fused‐oxa‐[n.2.1] skeletons were efficiently constructed. [ABSTRACT FROM AUTHOR]

Published
2020
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2. Organocatalytic Enantioselective Tandem Michael Addition and Cyclization Reaction of Trisubstituted 2-Nitro-1,3-enynes with Cyclic 1,3-Diketones.

Author

Xing, Zi ‐ Min, Song, Le ‐ Le, Li, Feng ‐ Xing, Xu, Nian ‐ Sheng, Wang, Lu ‐ Feng, Shi, Zi ‐ Fa, and Cao, Xiao ‐ Ping

Subjects
*ORGANOCATALYSIS, *ENANTIOSELECTIVE catalysis, *MICHAEL reaction, *RING formation (Chemistry), *KETONES, *AMIDES
Abstract

An enantioselective tandem Michael addition/cyclization reaction between trisubstituted 2-nitro-1,3-enynes and cyclic 1,3-diketones catalyzed by a chiral organosquaramide catalyst in the presence of Ag2CO3 was developed. The chiral functionalized chromene products could be obtained in good yield and in 80-99% enantiomeric excess. The structures and absolute configurations of some of the products were confirmed by X-ray crystallographic analysis. [ABSTRACT FROM AUTHOR]

Published
2017
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3. Synthesis of Chiral Aza‐[n.2.1] Skeletons by Separable Epimers of Intramolecular [3+2] Cross Cycloaddition of Cyclopropane 1,1‐Diesters with Chiral Sulfinylimines.

Author

Xia, Miao‐Miao, Li, Feng‐Xing, Ma, You‐Ping, Song, Le‐Le, Hou, Yan‐Ni, Shi, Zi‐Fa, and Cao, Xiao‐Ping

Subjects
*NORMAL-phase chromatography, *CYCLOPROPANE, *RING formation (Chemistry), *SKELETON, *SILICA gel
Abstract

Reported herein is the construction of chiral aza‐[n.2.1] skeletons by separable epimers of intramolecular [3+2] cross cycloaddition of cyclopropane 1,1‐diesters with chiral sulfinylimines. The epimer products can be separated by silica gel column chromatography. [ABSTRACT FROM AUTHOR]

Published
2020
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