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Your search keyword '"Pengwei Tan"' showing total 3 results
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3 results on '"Pengwei Tan"'

2. Reductive (3 + 2) Annulation of Benzils with Pyrylium Salts: Stereoselective Access to Furyl Analogues of cis-Chalcones

Author

Pengwei Tan and Sunewang R. Wang

Subjects
Annulation, 010405 organic chemistry, Chemistry, Organic Chemistry, Stereoselectivity, Physical and Theoretical Chemistry, 010402 general chemistry, 01 natural sciences, Biochemistry, Medicinal chemistry, 0104 chemical sciences
Abstract

An unprecedented reductive (3 + 2) annulation of both symmetrical and unsymmetrical benzils with pyrylium salts mediated by P(NMe2)3 is described, leading to facile and stereoselective access to th...

Published
2019
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3. Nucleophilic Migratory Cyclopropenation of Activated Alkynes: A Nonmetal Approach to Unbiased Cyclopropenes

Author

Haoran Wang, Pengwei Tan, and Sunewang R. Wang

Subjects
chemistry.chemical_classification, Annulation, 010405 organic chemistry, Alkene, Organic Chemistry, 010402 general chemistry, 01 natural sciences, Biochemistry, Combinatorial chemistry, Cycloaddition, 0104 chemical sciences, Adduct, Nucleophile, Nonmetal, chemistry, Fragmentation (mass spectrometry), Electrophile, Physical and Theoretical Chemistry
Abstract

An unprecedented reductive [2 + 1] annulation of α-keto esters with alkynones mediated by P(NMe2)3 is described. Although this nonmetal cyclopropenation is a nucleophilic process, attributed to the ester migration via a formal [2 + 2] cycloaddition reaction of Kukhtin-Ramirez adducts and alkynones followed by a fragmentation, cyclopropenes with an unbiased alkene scaffold are formed in good to excellent yields, thus providing a promising complementarity to electrophilic metal-catalyzed cyclopropenation.

Published
2021

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