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He J, Cook SP. Metal-free, photoinduced remote C(sp 3)-H borylation. Chem Sci 2023; 14:9476-9481. [PMID: 37712044 PMCID: PMC10498503 DOI: 10.1039/d3sc03048b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Accepted: 08/10/2023] [Indexed: 09/16/2023] Open
Abstract
Here, we describe a protocol for the metal-free, photo-induced borylation of unactivated C(sp3)-H bonds distal to an O-oxalate hydroxamic ester functionality. The methodology requires only substrate and bis(catecholato)diboron under light irradiation to effect the desired transformation. A range of linear and cyclic tertiary and secondary borylation products are obtained in good yields and high site-selectivity enabling the late-stage C(sp3)-H borylation of natural product derivatives and drug-like compounds.
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Affiliation(s)
- Jiachen He
- Department of Chemistry, Indiana University 800 East Kirkwood Avenue Bloomington IN 47405-7102 USA
| | - Silas P Cook
- Department of Chemistry, Indiana University 800 East Kirkwood Avenue Bloomington IN 47405-7102 USA
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2
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Du Z, Liu S, Li Y, Peng J, Sun Y, Song Y, Liu Y, Zeng X. Fluoroamide-Directed Regiodivergent C-Alkylation of Nitroalkanes. Org Lett 2023. [PMID: 37314942 DOI: 10.1021/acs.orglett.3c01297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Herein, by exploiting different activation modes of fluoroamides, we achieved α- and δ-C(sp3)-H alkylation of nitroalkanes with switchable regioselectivity. Cu catalysis enabled the interception of a distal C-centered radical by a N-centered radical to couple nitroalkanes and unactivated δ-C-H bonds. In addition, imines generated in situ by fluoroamides were trapped by nitroalkanes to realize the α-C-H alkylation of amides. Both of those scalable protocols have broad substrate scopes and good functional group tolerance.
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Affiliation(s)
- Zhibin Du
- School of Chemistry and Chemical Engineering, Nanchang University, Nanchang, Jiangxi 330031, China
| | - Shiwen Liu
- College of Textiles and Clothing, Institute of Flexible Functional Materials, Yancheng Institute of Technology, Yancheng, Jiangsu 224000, China
| | - Yuke Li
- School of Pharmacy, Nanchang University, Nanchang, Jiangxi 330031, China
| | - Junjie Peng
- School of Pharmacy, Nanchang University, Nanchang, Jiangxi 330031, China
| | - Yanji Sun
- School of Pharmacy, Nanchang University, Nanchang, Jiangxi 330031, China
| | - Yanshan Song
- School of Chemistry and Chemical Engineering, Nanchang University, Nanchang, Jiangxi 330031, China
| | - Yuxuan Liu
- School of Chemistry and Chemical Engineering, Nanchang University, Nanchang, Jiangxi 330031, China
| | - Xiaojun Zeng
- School of Chemistry and Chemical Engineering, Nanchang University, Nanchang, Jiangxi 330031, China
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3
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Ding H, Zhang S, Sun Z, Ma Q, Li Y, Yuan Y, Jia X. C-H Bond Activation Relay (CHAR) of Proline Ester Derivatives Promoted by In Situ Triarylamine Radical Cation: Selective Synthesis of 4-Bromopyrrole Derivatives. Chemistry 2023; 29:e202203654. [PMID: 36727278 DOI: 10.1002/chem.202203654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Revised: 01/14/2023] [Accepted: 02/01/2023] [Indexed: 02/03/2023]
Abstract
Using the in situ generated triarylamine radical cation as an initiator, the sp3 C-H bond of proline esters was smoothly oxidized and brominated through C-H activation relay (CHAR), giving a series of 4-bromopyrroles in good yields with high regioselectivity. The mechanistic study revealed that the oxidation of the active C-H bond initiated the followed 1,5-HAT and bromination, which provides a new method to realize the functionalization of the remote C-H bond.
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Affiliation(s)
- Han Ding
- School of Chemistry and Chemical Engineering, Yangzhou University, Siwangting Road 180, 225002, Yangzhou, Jiangsu, P. R. China
| | - Shuwei Zhang
- School of Chemistry and Chemical Engineering, Yangzhou University, Siwangting Road 180, 225002, Yangzhou, Jiangsu, P. R. China
| | - Zheng Sun
- School of Chemistry and Chemical Engineering, Yangzhou University, Siwangting Road 180, 225002, Yangzhou, Jiangsu, P. R. China
| | - Qiyuan Ma
- School of Chemistry and Chemical Engineering, Yangzhou University, Siwangting Road 180, 225002, Yangzhou, Jiangsu, P. R. China
| | - Yuemei Li
- School of Chemistry and Chemical Engineering, Yangzhou University, Siwangting Road 180, 225002, Yangzhou, Jiangsu, P. R. China
| | - Yu Yuan
- School of Chemistry and Chemical Engineering, Yangzhou University, Siwangting Road 180, 225002, Yangzhou, Jiangsu, P. R. China
| | - Xiaodong Jia
- School of Chemistry and Chemical Engineering, Yangzhou University, Siwangting Road 180, 225002, Yangzhou, Jiangsu, P. R. China
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4
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Li Y, Zhang S, Ma Q, Ding H, Sun Z, Yuan Y, Jia X. SbCl3 Initiated Aerobic Phosphorylation of sp3 C-H Bond: A Facile Approach to α-Phosphorylated Tetrahydroisoquinolines. Chem Asian J 2022; 17:e202200656. [PMID: 35946091 DOI: 10.1002/asia.202200656] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 08/04/2022] [Indexed: 11/07/2022]
Abstract
An aerobic phosphorylation of N-aryltetrahydroisoquinolines was realized by SbCl 3 initiated sp 3 C-H bond functionalization, providing a series of α-aminophosphonates in high yields. This work reveals that SbCl 3 /O 2 is an efficient and facile catalyst system to enable the aerobic C-H functionalization, and antimony containing reagents might be potentially applied to more general transformations.
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Affiliation(s)
- Yuemei Li
- Yangzhou University, School of Chemistry and Chemical Engineering, CHINA
| | - Shuwei Zhang
- Yangzhou University, School of Chemistry and Chemical Engineering, CHINA
| | - Qiyuan Ma
- Yangzhou University, School of Chemistry and Chemical Engineering, CHINA
| | - Han Ding
- Yangzhou University, School of Chemistry and Chemical Engineering, CHINA
| | - Zheng Sun
- Yangzhou University, School of Chemistry and Chemical Engineering, CHINA
| | - Yu Yuan
- Yangzhou University, School of Chemistry and Chemical Engineering, CHINA
| | - Xiaodong Jia
- Yangzhou University, School of Chemistry and Chemical Engineering, Yangzhou University, 180 Siwangting Road, 225002, Yangzhou, CHINA
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