Asymmetric Synthesis of Functionalized Phenylalanine Derivatives via Rh-Catalyzed Conjugate Addition and Enantioselective Protonation Cascade

Jia Hong Jian; Hao Wei Zeng; Ting Shen Kuo; Ping Yu Wu; Hsyueh Liang Wu

doi:10.1021/acs.orglett.9b03666

Asymmetric Synthesis of Functionalized Phenylalanine Derivatives via Rh-Catalyzed Conjugate Addition and Enantioselective Protonation Cascade

Jia Hong Jian, Hao Wei Zeng, Ting Shen Kuo, Ping Yu Wu, Hsyueh Liang Wu

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

7 Citations (Scopus)

Abstract

The asymmetric conjugate addition of arylboronic acids to N-phthalimidodehydroalanine 1i catalyzed by Rh(I)/L1a enables the facile preparation of chiral functionalized phenylalanines. The reaction proceeds by a conjugate addition and enantioselective protonation cascade, affording a rhodium enolate that undergoes re-face protonation. The reaction tolerates various arylboronic acids and can be used in the gram-scale synthesis of (S)-phenylalanine hydrochloride, demonstrating the reaction scope and the synthetic feasibility of the process.

Original language	English
Pages (from-to)	9468-9472
Number of pages	5
Journal	Organic Letters
Volume	21
Issue number	23
DOIs	https://doi.org/10.1021/acs.orglett.9b03666
Publication status	Published - 2019 Dec 6
Externally published	Yes

ASJC Scopus subject areas

Biochemistry
Physical and Theoretical Chemistry
Organic Chemistry

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title = "Asymmetric Synthesis of Functionalized Phenylalanine Derivatives via Rh-Catalyzed Conjugate Addition and Enantioselective Protonation Cascade",

abstract = "The asymmetric conjugate addition of arylboronic acids to N-phthalimidodehydroalanine 1i catalyzed by Rh(I)/L1a enables the facile preparation of chiral functionalized phenylalanines. The reaction proceeds by a conjugate addition and enantioselective protonation cascade, affording a rhodium enolate that undergoes re-face protonation. The reaction tolerates various arylboronic acids and can be used in the gram-scale synthesis of (S)-phenylalanine hydrochloride, demonstrating the reaction scope and the synthetic feasibility of the process.",

author = "Jian, {Jia Hong} and Zeng, {Hao Wei} and Kuo, {Ting Shen} and Wu, {Ping Yu} and Wu, {Hsyueh Liang}",

note = "Funding Information: Financial support from the Ministry of Science and Technology of the Republic of China (104-2628-M-003-001-MY3 and 107-2113-M-003-014-MY3) is gratefully acknowledged. Publisher Copyright: {\textcopyright} 2019 American Chemical Society.",

year = "2019",

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day = "6",

doi = "10.1021/acs.orglett.9b03666",

language = "English",

volume = "21",

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journal = "Organic Letters",

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T1 - Asymmetric Synthesis of Functionalized Phenylalanine Derivatives via Rh-Catalyzed Conjugate Addition and Enantioselective Protonation Cascade

AU - Jian, Jia Hong

AU - Zeng, Hao Wei

AU - Kuo, Ting Shen

AU - Wu, Ping Yu

AU - Wu, Hsyueh Liang

N1 - Funding Information: Financial support from the Ministry of Science and Technology of the Republic of China (104-2628-M-003-001-MY3 and 107-2113-M-003-014-MY3) is gratefully acknowledged. Publisher Copyright: © 2019 American Chemical Society.

PY - 2019/12/6

Y1 - 2019/12/6

N2 - The asymmetric conjugate addition of arylboronic acids to N-phthalimidodehydroalanine 1i catalyzed by Rh(I)/L1a enables the facile preparation of chiral functionalized phenylalanines. The reaction proceeds by a conjugate addition and enantioselective protonation cascade, affording a rhodium enolate that undergoes re-face protonation. The reaction tolerates various arylboronic acids and can be used in the gram-scale synthesis of (S)-phenylalanine hydrochloride, demonstrating the reaction scope and the synthetic feasibility of the process.

AB - The asymmetric conjugate addition of arylboronic acids to N-phthalimidodehydroalanine 1i catalyzed by Rh(I)/L1a enables the facile preparation of chiral functionalized phenylalanines. The reaction proceeds by a conjugate addition and enantioselective protonation cascade, affording a rhodium enolate that undergoes re-face protonation. The reaction tolerates various arylboronic acids and can be used in the gram-scale synthesis of (S)-phenylalanine hydrochloride, demonstrating the reaction scope and the synthetic feasibility of the process.

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Asymmetric Synthesis of Functionalized Phenylalanine Derivatives via Rh-Catalyzed Conjugate Addition and Enantioselective Protonation Cascade

Abstract

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