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Wang Z, Cao T, Zhu S. Gold-Catalyzed Enynal and Enynol Coupling by Selectively Steering Two Transient Vinyl-Gold Intermediates. Org Lett 2022; 24:9296-9300. [PMID: 36484517 DOI: 10.1021/acs.orglett.2c03890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The vinyl-gold bond is easily accessible but less exploited in homogeneous gold catalysis, which possesses weak nucleophilicity and would be likely to undergo protodemetalation. Herein, a gold-catalyzed enynal and enynol coupling by selectively steering two transient vinyl-gold intermediates is realized under mild conditions. It exhibits high atom economy and good tolerance of functional groups with the added benefit of operational simplicity. The control experiments indicated that the in situ formed vinyl-gold accounts for the reactivity.
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Affiliation(s)
- Zipeng Wang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, P. R. China
| | - Tongxiang Cao
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, P. R. China
| | - Shifa Zhu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, P. R. China
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2
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Ramesh G, Srivardhan V, Balamurugan R. Ag(I)-catalyzed cyclization of o-alkynylacetophenones facilitated through acetal formation: synthesis of C3-naphthyl indole derivatives. Org Biomol Chem 2022; 20:9698-9702. [PMID: 36416470 DOI: 10.1039/d2ob01873j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
A mild method for an efficient synthesis of C3-naphthyl indoles from o-alkynylacetophenones has been developed. This Ag-catalyzed transformation is assisted by the acetal formed under the reaction condition employing trimethyl orthoformate (TMOF). The role of acetal in promoting the reaction under ambient conditions has been established with control experiments. A range of C3-naphthyl indole derivatives have been synthesized in moderate to very good yields.
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Affiliation(s)
- Golla Ramesh
- School of Chemistry, University of Hyderabab, Hyderabad-500046, India.
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3
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Trending strategies for the synthesis of quinolinones and isoquinolinones. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.133093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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4
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Suryawanshi VB, Bondge AS, Dawle JK, Mathapati SR. Cu(OAc) 2.H 2O Catalyzed C − H/C − N Bond Functionalization for the Synthesis of Isoquinoline Derivatives as Potential Antifungal Agent. Polycycl Aromat Compd 2022. [DOI: 10.1080/10406638.2021.1892777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
| | - Abhay S. Bondge
- Department of Chemistry, Shivneri Mahavidyalaya, Shirur Anantpal, Maharashtra, India
| | - Jairaj K. Dawle
- Research Laboratory for Pure and Applied Chemistry, M. M. College, Nilanga, Maharashtra, India
| | - Sushil R. Mathapati
- Department of Chemistry, Shri Madhavrao Patil Mahavidyalaya, Murum, Maharashtra, India
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5
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Kuan TH, Kotipalli T, Chen CC, Hou DR. Addition of benzyl ethers to alkynes: a metal-free synthesis of 1 H-isochromenes. Org Biomol Chem 2021; 19:10390-10402. [PMID: 34825694 DOI: 10.1039/d1ob01941d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Bromotrimethylsilane (TMSBr)-promoted intramolecular cyclization of (o-arylethynyl)benzyl ethers to form 1H-isochromenes at room temperature is reported. Further studies indicated that vinyl carbocations are the reaction intermediates which are stabilized by the conjugated aryl groups. Thus, O-addition of benzyl ethers/tetrahydropyrans to alkynes was achieved under metal-free, acidic conditions. These reaction conditions were compatible with an alkynyl Prins reaction; therefore, 1H-isochromenes were produced directly from alkynyl benzaldehydes and alkynyl alcohols using a one-pot procedure.
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Affiliation(s)
- Tzu-Hsuan Kuan
- Department of Chemistry, National Central University, No. 300 Jhong-Da Road, Jhong-li, Taoyuan, 32001, Taiwan.
| | - Trimurtulu Kotipalli
- Department of Chemistry, National Central University, No. 300 Jhong-Da Road, Jhong-li, Taoyuan, 32001, Taiwan.
| | - Cheng-Chun Chen
- Department of Chemistry, National Central University, No. 300 Jhong-Da Road, Jhong-li, Taoyuan, 32001, Taiwan.
| | - Duen-Ren Hou
- Department of Chemistry, National Central University, No. 300 Jhong-Da Road, Jhong-li, Taoyuan, 32001, Taiwan.
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6
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Satish N, Raju SK, Nanubolu JB, Sudhakar G. The synthesis of indeno[de]isochromene derivatives from arylvinyl epoxides and carbonyl compounds via tandem Nazarov and oxa-Pictet–Spengler cyclizations. NEW J CHEM 2021. [DOI: 10.1039/d1nj03654h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The conversion of aryl vinyl epoxides and carbonyl compounds in the presence of a catalytic amount of BF3·OEt2 to indeno[de]isochromenes via tandem Nazarov and oxa-Pictet–Spengler cyclizations is described.
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Affiliation(s)
- Nagam Satish
- Department of Organic Synthesis & Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad-500007, Telangana, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, UP, India
| | - Siruvuri Krishnam Raju
- Department of Organic Synthesis & Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad-500007, Telangana, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, UP, India
| | - Jagadeesh Babu Nanubolu
- Department of Analytical & Structural Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad-500007, Telangana, India
| | - Gangarajula Sudhakar
- Department of Organic Synthesis & Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad-500007, Telangana, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, UP, India
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7
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Kumar K, Singh B, Singh RP. A silver-catalyzed stereoselective domino cycloisomerization-vinylogous aldol reaction of ortho-alkynylbenzaldehydes with 3-alkylidene oxindoles: an entry to functionalized isochromenes. Chem Commun (Camb) 2020; 56:15153-15156. [PMID: 33210695 DOI: 10.1039/d0cc06273a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A silver tetrafluoroborate catalyzed domino cycloisomerization-vinylogous aldol addition sequence on a multifunctional substrate such as ortho-alkynylbenzaldehydes yielding functionalized 1H-isochromenes in a single step with high yield and excellent diastereoselectivity (>19 : 1) is described. The reaction was well tolerated by alkyl, aryl, and unsubstituted alkynylbenzaldehydes, and furnished selective 6-endo-dig adducts exclusively without loss in the regio- as well as diastereoselectivity.
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Affiliation(s)
- Krishna Kumar
- Department of Chemistry, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi-110016, India.
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8
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Cao Z, Zhu J, Liu L, Pang Y, Tian L, Sun X, Meng X. AgNTf 2-catalyzed formal [3 + 2] cycloaddition of ynamides with unprotected isoxazol-5-amines: efficient access to functionalized 5-amino-1 H-pyrrole-3-carboxamide derivatives. Beilstein J Org Chem 2019; 15:2623-2630. [PMID: 31807197 PMCID: PMC6880818 DOI: 10.3762/bjoc.15.255] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2019] [Accepted: 10/15/2019] [Indexed: 12/13/2022] Open
Abstract
A formal [3 + 2] cycloaddition between ynamides and unprotected isoxazol-5-amines has been developed in the presence of catalytic AgNTf2 in an open flask. By the protocol, a variety of functionalized 5-amino-1H-pyrrole-3-carboxamide derivatives can be obtained in up to 99% yield. The reaction mechanism might involve the generation of an unusual α-imino silver carbene intermediate (or a silver-stabilized carbocation) and subsequent cyclization/isomerization to build the significant pyrrole-3-carboxamide motif. The reaction features the use of an inexpensive catalyst, simple reaction conditions, simple work-up without column chromatographic purification for most of products and high yields.
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Affiliation(s)
- Ziping Cao
- Qufu Normal University, School of Chemistry and Chemical Engineering, Qufu 273165, P. R. China
| | - Jiekun Zhu
- Qufu Normal University, School of Chemistry and Chemical Engineering, Qufu 273165, P. R. China
| | - Li Liu
- Qufu Normal University, School of Chemistry and Chemical Engineering, Qufu 273165, P. R. China
| | - Yuanling Pang
- Qufu Normal University, School of Chemistry and Chemical Engineering, Qufu 273165, P. R. China
| | - Laijin Tian
- Qufu Normal University, School of Chemistry and Chemical Engineering, Qufu 273165, P. R. China
- Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, Shandong Key Laboratory of Life-Organic Analysis, Qufu 273165, P. R. China
| | - Xuejun Sun
- Qufu Normal University, School of Chemistry and Chemical Engineering, Qufu 273165, P. R. China
| | - Xin Meng
- Qufu Normal University, School of Chemistry and Chemical Engineering, Qufu 273165, P. R. China
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Cao Z, Yan S, Zhao C, Sun X, Tian L, Meng X. AgOTf-catalyzed reaction of sulfonyl hydrazones with ynamides led to stereoselective synthesis of α-amino alkenyl-substituted hydrazone derivatives. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.130534] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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10
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Zhu J, Wang Q, Meng X, Zhao C, Sun X, Tian L, Cao Z. Direct Hydroheteroarylation of Ynamides with 2 H
-Tetrazoles: Regio- and Stereoselective Synthesis of ( Z
)- α
-Tetrazole Enamides. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900604] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Jiekun Zhu
- School of Chemistry and Chemical Engineering; Qufu Normal University; Qufu 273165 Shandong P. R. China
| | - Qingbo Wang
- School of Chemistry and Chemical Engineering; Qufu Normal University; Qufu 273165 Shandong P. R. China
| | - Xin Meng
- School of Chemistry and Chemical Engineering; Qufu Normal University; Qufu 273165 Shandong P. R. China
| | - Changyin Zhao
- School of Chemistry and Chemical Engineering; Qufu Normal University; Qufu 273165 Shandong P. R. China
| | - Xuejun Sun
- School of Chemistry and Chemical Engineering; Qufu Normal University; Qufu 273165 Shandong P. R. China
| | - Laijin Tian
- School of Chemistry and Chemical Engineering; Qufu Normal University; Qufu 273165 Shandong P. R. China
- Shandong Key Laboratory of Life-Organic Analysis; Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine; Qufu 273165 Shandong P. R. China
| | - Ziping Cao
- School of Chemistry and Chemical Engineering; Qufu Normal University; Qufu 273165 Shandong P. R. China
- Shandong Key Laboratory of Life-Organic Analysis; Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine; Qufu 273165 Shandong P. R. China
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