Organophosphane-catalyzed direct β-acylation of 4-arylidene pyrazolones and 5-arylidene thiazolones with acyl chlorides

Pankaj V. Khairnar; Yin Hsiang Su; Yung Chang Chen; Athukuri Edukondalu; Yi Ru Chen; Wenwei Lin

doi:10.1021/acs.orglett.0c02408

Organophosphane-catalyzed direct β-acylation of 4-arylidene pyrazolones and 5-arylidene thiazolones with acyl chlorides

Pankaj V. Khairnar, Yin Hsiang Su, Yung Chang Chen, Athukuri Edukondalu, Yi Ru Chen, Wenwei Lin

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

Abstract

An efficient method for the direct β-acylation of arylidene pyrazolones and thiazolones with acyl chlorides in the presence of a base catalyzed by organophosphanes is reported. A variety of functionalized 4-arylidene pyrazolone and 5-arylidene thiazolone derivatives were prepared under metal-free and mild conditions via a tandem phospha-Michael addition/O-acylation/intramolecular cyclization/rearrangement sequence. Our mechanistic investigations revealed that the reaction is highly stereospecific to provide exclusively cis-isomers, and the methodology can also be scaled up with similar efficacy.

Original language	English
Pages (from-to)	6868-6872
Number of pages	5
Journal	Organic Letters
Volume	22
Issue number	17
DOIs	https://doi.org/10.1021/acs.orglett.0c02408
Publication status	Published - 2020 Sep 4

ASJC Scopus subject areas

Biochemistry
Physical and Theoretical Chemistry
Organic Chemistry

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title = "Organophosphane-catalyzed direct β-acylation of 4-arylidene pyrazolones and 5-arylidene thiazolones with acyl chlorides",

abstract = "An efficient method for the direct β-acylation of arylidene pyrazolones and thiazolones with acyl chlorides in the presence of a base catalyzed by organophosphanes is reported. A variety of functionalized 4-arylidene pyrazolone and 5-arylidene thiazolone derivatives were prepared under metal-free and mild conditions via a tandem phospha-Michael addition/O-acylation/intramolecular cyclization/rearrangement sequence. Our mechanistic investigations revealed that the reaction is highly stereospecific to provide exclusively cis-isomers, and the methodology can also be scaled up with similar efficacy. ",

author = "Khairnar, {Pankaj V.} and Su, {Yin Hsiang} and Chen, {Yung Chang} and Athukuri Edukondalu and Chen, {Yi Ru} and Wenwei Lin",

year = "2020",

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doi = "10.1021/acs.orglett.0c02408",

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T1 - Organophosphane-catalyzed direct β-acylation of 4-arylidene pyrazolones and 5-arylidene thiazolones with acyl chlorides

AU - Khairnar, Pankaj V.

AU - Su, Yin Hsiang

AU - Chen, Yung Chang

AU - Edukondalu, Athukuri

AU - Chen, Yi Ru

AU - Lin, Wenwei

PY - 2020/9/4

Y1 - 2020/9/4

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AB - An efficient method for the direct β-acylation of arylidene pyrazolones and thiazolones with acyl chlorides in the presence of a base catalyzed by organophosphanes is reported. A variety of functionalized 4-arylidene pyrazolone and 5-arylidene thiazolone derivatives were prepared under metal-free and mild conditions via a tandem phospha-Michael addition/O-acylation/intramolecular cyclization/rearrangement sequence. Our mechanistic investigations revealed that the reaction is highly stereospecific to provide exclusively cis-isomers, and the methodology can also be scaled up with similar efficacy.

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