1
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Schoeggl Toledano A, Bitai J, Covini D, Karolyi-Oezguer J, Dank C, Berger H, Gollner A. Synthesis of Indazoles via N-N Bond-Forming Oxidative Cyclization from 2-Aminomethyl-phenylamines. Org Lett 2024; 26:1229-1232. [PMID: 38315455 DOI: 10.1021/acs.orglett.4c00036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2024]
Abstract
Herein we report a method for the synthesis of indazoles from readily available 2-aminomethyl-phenylamines via N-N bond-forming oxidative cyclization. Inspired by indazole formation initially observed as a side product by N. Coskun et al. we developed a robust protocol to access indazoles in all three tautomeric forms. The method selectively gives access to various 2-substituted 2H-indazoles which are frequently used in drug design, and we also demonstrated its applicability to less studied 3H-indazoles.
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Affiliation(s)
- Anna Schoeggl Toledano
- Boehringer Ingelheim RCV GmbH & Co KG, Dr. Boehringer-Gasse 5-11, A-1121 Vienna, Austria
| | - Jacqueline Bitai
- Boehringer Ingelheim RCV GmbH & Co KG, Dr. Boehringer-Gasse 5-11, A-1121 Vienna, Austria
| | - David Covini
- Boehringer Ingelheim RCV GmbH & Co KG, Dr. Boehringer-Gasse 5-11, A-1121 Vienna, Austria
| | - Jale Karolyi-Oezguer
- Boehringer Ingelheim RCV GmbH & Co KG, Dr. Boehringer-Gasse 5-11, A-1121 Vienna, Austria
| | - Christian Dank
- Boehringer Ingelheim RCV GmbH & Co KG, Dr. Boehringer-Gasse 5-11, A-1121 Vienna, Austria
| | - Helmut Berger
- Boehringer Ingelheim RCV GmbH & Co KG, Dr. Boehringer-Gasse 5-11, A-1121 Vienna, Austria
| | - Andreas Gollner
- Boehringer Ingelheim RCV GmbH & Co KG, Dr. Boehringer-Gasse 5-11, A-1121 Vienna, Austria
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2
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Luo J, Ma H, Wu K, Ao Y, Zhou W, Cai Q. An Alkyne-Isocyanide Cycloaddition/Boulton-Katritzky Rearrangement/Ring Expansion Reaction: Access to 9-Deazaguanines. Org Lett 2023; 25:2123-2128. [PMID: 36943758 DOI: 10.1021/acs.orglett.3c00575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2023]
Abstract
An alkyne-isocyanide [3 + 2] cycloaddition followed by a Boulton-Katritzky rearrangement and a ring expansion is demonstrated. Different from the typical Boulton-Katritzky rearrangement, which forms five-membered ring products, the rearrangement-ring expansion method provides a mild, efficient, and atom-economical access to fused 9-deazaguanine structures in high yields.
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Affiliation(s)
- Jianghao Luo
- International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Discovery of Chinese Ministry of Education (MOE), College of Pharmacy, Jinan University, No. 601 Huangpu Avenue West, Guangzhou 510632, China
| | - Haowen Ma
- International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Discovery of Chinese Ministry of Education (MOE), College of Pharmacy, Jinan University, No. 601 Huangpu Avenue West, Guangzhou 510632, China
| | - Kaifu Wu
- International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Discovery of Chinese Ministry of Education (MOE), College of Pharmacy, Jinan University, No. 601 Huangpu Avenue West, Guangzhou 510632, China
| | - Yunlin Ao
- International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Discovery of Chinese Ministry of Education (MOE), College of Pharmacy, Jinan University, No. 601 Huangpu Avenue West, Guangzhou 510632, China
| | - Wei Zhou
- International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Discovery of Chinese Ministry of Education (MOE), College of Pharmacy, Jinan University, No. 601 Huangpu Avenue West, Guangzhou 510632, China
| | - Qian Cai
- International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Discovery of Chinese Ministry of Education (MOE), College of Pharmacy, Jinan University, No. 601 Huangpu Avenue West, Guangzhou 510632, China
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3
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Li Z, Qiu K, Yang X, Zhou W, Cai Q. Base-Promoted Tandem S NAr/Boulton-Katritzky Rearrangement: Access to [1,2,4]Triazolo[1,5- a]pyridines. Org Lett 2022; 24:2989-2992. [PMID: 35441511 DOI: 10.1021/acs.orglett.2c00863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A base-promoted tandem SNAr/Boulton-Katritzky rearrangement is developed. It offers a simple and straightforward method for the formation of functionalized [1,2,4]triazolo[1,5-a]pyridines from 1,2,4-oxadiazol-3-amines or 3-aminoisoxazoles with 2-fluoropyridines.
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Affiliation(s)
- Zihao Li
- College of Pharmacy, Jinan University, No. 601 Huangpu Avenue West, Guangzhou 510630, China
| | - Kongxi Qiu
- College of Pharmacy, Jinan University, No. 601 Huangpu Avenue West, Guangzhou 510630, China
| | - Xiao Yang
- College of Pharmacy, Jinan University, No. 601 Huangpu Avenue West, Guangzhou 510630, China
| | - Wei Zhou
- College of Pharmacy, Jinan University, No. 601 Huangpu Avenue West, Guangzhou 510630, China
| | - Qian Cai
- College of Pharmacy, Jinan University, No. 601 Huangpu Avenue West, Guangzhou 510630, China
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4
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Xiong H, Li Z, Tang H, He L, Zhou W. Tandem C-N Coupling/Boulton-Katritzky Rearrangement Reactions of 3-Aminoisoxazoles or 1,2,4-Oxadiazol-3-amines with 2-Pyridyl Trifluoromethanesulfonate: A Rapid Access to [1,2,4]Triazolo[1,5-a]pyridines. Org Chem Front 2022. [DOI: 10.1039/d2qo00514j] [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
An efficient and convenient synthesis of functionalized [1,2,4]triazolo[1,5-a]pyridines derivates is presented. The protocol is through a palladium catalyzed tandem C-N coupling/Boulton-Katritzky rearrangement process from 3-aminoisoxazoles or 1,2,4-oxadiazol-3-amines with 2-pyridyl trifluoromethanesulfonate....
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5
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Ostache NC, Hiebel MA, Fînaru AL, Allouchi H, Guillaumet G, Suzenet F. Access and modulation of substituted 1-methyl-1,6-dihydropyrazolo[3,4- c]pyrazoles. RSC Adv 2021; 11:9756-9765. [PMID: 35423466 PMCID: PMC8695482 DOI: 10.1039/d1ra00314c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Accepted: 02/23/2021] [Indexed: 11/21/2022] Open
Abstract
Despite the pharmacological potential of the pyrazolo[3,4-c]pyrazoles, only a few methods of preparation and direct functionalization of this moiety have been described. We report herein a convenient design of new pyrazolo[3,4-c]pyrazoles with a high therapeutic impact. The effective chosen strategy consists of hydrazine condensations and C–N Ullmann-type cross-coupling reactions with microwave activation. Moreover, chemoselective bromination of the newly formed bipyrazoles followed by Suzuki–Miyaura cross-coupling reactions allowed the synthesis of a variety of modulated heterobicycles. A convenient design of pyrazolo[3,4-c]pyrazoles is reported through hydrazine condensations and C–N Ullmann-type cross-coupling reactions. Chemoselective bromination followed by Suzuki–Miyaura cross-coupling reactions access to a variety of modulated heterobicycles.![]()
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Affiliation(s)
- Nicu-Cosmin Ostache
- Institut de Chimie Organique et Analytique (ICOA)
- Université d'Orléans
- UMR CNRS 7311
- 45067 Orléans Cedex 2
- France
| | - Marie-Aude Hiebel
- Institut de Chimie Organique et Analytique (ICOA)
- Université d'Orléans
- UMR CNRS 7311
- 45067 Orléans Cedex 2
- France
| | - Adriana-Luminiţa Fînaru
- Center of Applied Chemistry and Process Engineering (CAIP)
- University “Vasile Alecsandri” of Bacau
- Bacău
- Romania
| | - Hassan Allouchi
- Synthèse et Isolement de Molécules BioActives (SIMBA)
- EA 7502
- Laboratoire de Chimie Physique
- Université de Tours
- 37200 Tours
| | - Gérald Guillaumet
- Institut de Chimie Organique et Analytique (ICOA)
- Université d'Orléans
- UMR CNRS 7311
- 45067 Orléans Cedex 2
- France
| | - Franck Suzenet
- Institut de Chimie Organique et Analytique (ICOA)
- Université d'Orléans
- UMR CNRS 7311
- 45067 Orléans Cedex 2
- France
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6
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Zhao H, Huang J, Zhang J, Tang Y, Zhang Y. Synthesis of 1
H
‐Indazoles and Quinazolines Using Additive Intermediates of Grignard Reagents to 2‐Amino Benzonitriles. ChemistrySelect 2020. [DOI: 10.1002/slct.201904794] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Huantian Zhao
- Department of Chemistry College of Chemistry and Materials ScienceJinan University No. 601 Huangpudadao Guangzhou, MD 510632 China
| | - Jiefang Huang
- Department of Chemistry College of Chemistry and Materials ScienceJinan University No. 601 Huangpudadao Guangzhou, MD 510632 China
| | - Jing Zhang
- Department of Chemistry College of Chemistry and Materials ScienceJinan University No. 601 Huangpudadao Guangzhou, MD 510632 China
| | - Yu Tang
- Department of Chemistry College of Chemistry and Materials ScienceJinan University No. 601 Huangpudadao Guangzhou, MD 510632 China
| | - Yuanming Zhang
- Department of Chemistry College of Chemistry and Materials ScienceJinan University No. 601 Huangpudadao Guangzhou, MD 510632 China
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7
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Kotagiri R, Deng Z, Xu W, Cai Q. Stereospecific Synthesis of ( E)-5-Tetrasubstituted-ylidene-3,5-dihydro-4 H-imidazol-4-ones. Org Lett 2019; 21:3946-3949. [PMID: 31140817 DOI: 10.1021/acs.orglett.9b01063] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A stereospecific synthesis of ( E)-5-tetrasubstituted-ylidene-3,5-dihydro-4 H-imidazol-4-one derivatives is demonstrated through a cascade process by combination of a Michael addition and Boulton-Katritzky rearrangement. The method provides a simple and efficient approach for the synthesis of ( E)-5-tetrasubstituted-ylidene-3,5-dihydro-4 H-imidazol-4-ones from the reactions of N-(isoxazol-3-yl)-propiolamides or N-(1,2,4-oxadiazo-3-yl) propiolamides with N or C nucleophiles.
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Affiliation(s)
- Rajendraprasad Kotagiri
- International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development of Chinese Ministry of Education, College of Pharmacy , Jinan University , No 601 Huangpu Avenue West , Guangzhou 510632 , China
| | - Zhuoji Deng
- International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development of Chinese Ministry of Education, College of Pharmacy , Jinan University , No 601 Huangpu Avenue West , Guangzhou 510632 , China
| | - Wei Xu
- International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development of Chinese Ministry of Education, College of Pharmacy , Jinan University , No 601 Huangpu Avenue West , Guangzhou 510632 , China
| | - Qian Cai
- International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development of Chinese Ministry of Education, College of Pharmacy , Jinan University , No 601 Huangpu Avenue West , Guangzhou 510632 , China
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8
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9
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Liu J, Chen C, Kotagiri R, Yang W, Cai Q. A Simple Transformation of 1‐(Isoxazol‐3‐yl)ureas to 5‐(2‐oxoalkyl)‐2,4‐dihydro‐3H‐1,2,4‐triazol‐3‐ones through Base‐Promoted Boulton‐Katritzky Rearrangement. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201801357] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jisheng Liu
- College of PharmacyJinan University No. 601 Huangpu Avenue West Guangzhou 510632 People's Republic of China
- Guangzhou City Key Laboratory of Precision Chemical Drug Development
| | - Chen Chen
- College of PharmacyJinan University No. 601 Huangpu Avenue West Guangzhou 510632 People's Republic of China
- Guangzhou City Key Laboratory of Precision Chemical Drug Development
| | - Rajendraprasad Kotagiri
- College of PharmacyJinan University No. 601 Huangpu Avenue West Guangzhou 510632 People's Republic of China
| | - Wenqiang Yang
- College of PharmacyLinyi University Shuangling Road Linyi 276000 People's Republic of China
| | - Qian Cai
- College of PharmacyJinan University No. 601 Huangpu Avenue West Guangzhou 510632 People's Republic of China
- Guangzhou City Key Laboratory of Precision Chemical Drug Development
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