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Bao X, Wang G, Dong X, Zhu M, Yang L, Zhu J, Shi Q, Zhang H, Chen D. I 2/CF 3CO 2Ag-mediated iodolactonization of various allenoic acids to access versatile 6- to 9-membered ring vinylic iodolactones. Org Biomol Chem 2024; 22:2443-2450. [PMID: 38416045 DOI: 10.1039/d4ob00061g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/29/2024]
Abstract
Medium-sized lactones are important structural units, but their synthesis remains a great challenge. Herein, we report I2/CF3CO2Ag-mediated iodolactonization of allenoic acids to synthesize various 6- to 9-membered ring vinylic iodolactones in 16-89% yield. This protocol not only develops a new cyclization strategy of allenoic acids, but also provides highly functionalized medium-sized lactones containing alkene and halogen groups.
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Affiliation(s)
- Xiaobo Bao
- College of Pharmacy, Jiangsu Vocational College of Medicine, Yancheng, 224005, China
- School of Pharmacy, Nanjing Medical University, Nanjing, 211166, China.
| | - Guoli Wang
- School of Pharmacy, Nanjing Medical University, Nanjing, 211166, China.
| | - Xu Dong
- School of Pharmacy, Nanjing Medical University, Nanjing, 211166, China.
| | - Mengxiao Zhu
- School of Pharmacy, Nanjing Medical University, Nanjing, 211166, China.
| | - Lili Yang
- School of Pharmacy, Nanjing Medical University, Nanjing, 211166, China.
| | - Junjie Zhu
- School of Pharmacy, Nanjing Medical University, Nanjing, 211166, China.
| | - Qingyuan Shi
- School of Pharmacy, Nanjing Medical University, Nanjing, 211166, China.
| | - Hongzhen Zhang
- School of Pharmacy, Nanjing Medical University, Nanjing, 211166, China.
| | - Dongyin Chen
- School of Pharmacy, Nanjing Medical University, Nanjing, 211166, China.
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Mukhopadhyay S, Khaitan B, Gandhi S. Synthesis of tricyclic oxazinoindolones via Pd-catalyzed intramolecular addition of carboxylic acids to alkynes. Org Biomol Chem 2023; 21:9326-9329. [PMID: 37986617 DOI: 10.1039/d3ob01672b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2023]
Abstract
A completely atom-economical synthesis of the oxazinoindolone core via the Pd-catalyzed intramolecular addition of carboxylic acids to alkynes has been developed. Oxazinoindolones have been known to have varied biological activities. The reaction proceeds via 6-exo-dig cyclization and affords the products in high yields (55-93%). The developed method demonstrates the applicability of a Pd(0) complex in combination with a substrate-tethered acid for the 1,2-addition of carboxylic acids to alkynes.
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Affiliation(s)
- Subhamoy Mukhopadhyay
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Berhampur 760010, India.
| | - Bhavya Khaitan
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Berhampur 760010, India.
| | - Shikha Gandhi
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Berhampur 760010, India.
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Rahman M, Gao P, Zhao Q, Lalancette R, Szostak R, Szostak M. [Au(Np #)Cl]: Highly Reactive and Broadly Applicable Au(I)─NHC Catalysts for Alkyne π-Activation Reactions. Catal Sci Technol 2023; 13:5131-5139. [PMID: 38464950 PMCID: PMC10923537 DOI: 10.1039/d3cy00717k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2024]
Abstract
Cationic Au(I)─NHC (NHC = N-heterocyclic carbene) complexes have become an important class of catalysts for alkyne π-activation reactions in organic synthesis. In particular, these complexes are characterized by high stability of catalytic species engendered by strong σ-donation and metal backbonding. Herein, we report the synthesis and characterization of well-defined [Au(NHC)Cl] complexes featuring recently discovered IPr# family of ligands that hinge upon modular peralkylation of aniline. These ligands have been commercialized in collaboration with MilliporeSigma (IPr#: 915653; Np#: 915912; BIAN-IPr#: 916420). Evaluation of the [Au(NHC)Cl] complexes in a series of Au(I)─NHC-catalyzed π-functionalizations of alkynes, such as hydrocarboxylation, hydroamination and hydration, resulted in the identification of wingtip-flexible [Au(Np#)Cl] as a highly reactive and broadly applicable catalyst with the re-activity outperforming the classical [Au(IPr)Cl] and [Au(IPr*)Cl] complexes. The utility of this catalyst has been demonstrated in the direct late-stage derivatization of complex pharmaceuticals. Structural and computational studies were conducted to determine steric effects, frontier molecular orbitals and bond orders of this class of catalysts. Considering the attractive features of well-defined Au(I)─NHC complexes, we anticipate that this class of bulky and wingtip-flexible Au(I)─NHCs based on the modular peralkylated naphthylamine scaffold will find broad application in π-functionalization of alkynes in various areas of organic synthesis and catalysis.
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Affiliation(s)
- Mahbubur Rahman
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ 07102, United States
| | - Pengcheng Gao
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ 07102, United States
| | - Qun Zhao
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ 07102, United States
| | - Roger Lalancette
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ 07102, United States
| | - Roman Szostak
- Department of Chemistry, Wroclaw University, F. Joliot-Curie 14, Wroclaw 50-383, Poland
| | - Michal Szostak
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ 07102, United States
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Teixeira P, Bastin S, César V. Fused Polycyclic NHC Ligands in Gold Catalysis: Recent Advances. Isr J Chem 2022. [DOI: 10.1002/ijch.202200051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Paul Teixeira
- LCC-CNRS Université de Toulouse, CNRS 205 route de Narbonne F-31077 Toulouse France
| | - Stéphanie Bastin
- LCC-CNRS Université de Toulouse, CNRS 205 route de Narbonne F-31077 Toulouse France
| | - Vincent César
- LCC-CNRS Université de Toulouse, CNRS 205 route de Narbonne F-31077 Toulouse France
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