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Tanimoto H, Adachi R, Tanisawa K, Tomohiro T. Amphos-Mediated Conversion of Alkyl Azides to Diazo Compounds and One-Pot Azide-Site Selective Transient Protection, Click Conjugation, and Deprotective Transformation. Org Lett 2024. [PMID: 38502004 DOI: 10.1021/acs.orglett.4c00566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/20/2024]
Abstract
A one-pot conversion of alkyl azides to diazo compounds is outlined. After the reaction of α-azidocarbonyl compounds with Amphos, treatment of the resulting phosphazides with silica gel in a wet solvent afforded α-diazo carbonyl products. Through the azido group protection property of Amphos, inter- and intramolecular azide-site selective reactions of azido group protection, click functionalization, and deprotection of the diazo group have been demonstrated in one pot.
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Affiliation(s)
- Hiroki Tanimoto
- Faculty of Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan
| | - Ryo Adachi
- Faculty of Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan
| | - Kodai Tanisawa
- Faculty of Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan
| | - Takenori Tomohiro
- Faculty of Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan
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Luo W, Xu F, Wang Z, Pang J, Wang Z, Sun Z, Peng A, Cao X, Li L. Chemodivergent Staudinger Reactions of Secondary Phosphine Oxides and Application to the Total Synthesis of LL-D05139β Potassium Salt. Angew Chem Int Ed Engl 2023; 62:e202310118. [PMID: 37594845 DOI: 10.1002/anie.202310118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2023] [Revised: 08/15/2023] [Accepted: 08/16/2023] [Indexed: 08/19/2023]
Abstract
Unprecedented Staudinger reaction modes of secondary phosphine oxides (SPO) and organic azides are herein disclosed. By the application of various additives, selective nitrogen atom exclusion from the azide group has been achieved. Chlorotrimethylsilane mediates a stereoretentive Staudinger reaction with a 2-N exclusion which provides a valuable method for the synthesis of phosphinic amides and can be considered complementary to the stereoinvertive Atherton-Todd reaction. Alternatively, a 1-N exclusion pathway is promoted by acetic acid to provide the corresponding diazo compound. The effectiveness of this protocol has been further demonstrated by the total synthesis of the diazo-containing natural product LL-D05139β, which was prepared as a potassium salt for the first time in 6 steps and 26.5 % overall yield.
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Affiliation(s)
- Wenjun Luo
- School of Chemistry, Sun Yat-sen University, 510275, Guangzhou, P. R. China
- PCFM Lab and GDHPRC Lab, Sun Yat-sen University, 510275, Guangzhou, P. R. China
| | - Fang Xu
- International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development, Ministry of Education (MOE) of P. R. China, College of Pharmacy, Jinan University, 510632, Guangzhou, Guangdong, P. R. China
| | - Zhenguo Wang
- School of Chemistry, Sun Yat-sen University, 510275, Guangzhou, P. R. China
- PCFM Lab and GDHPRC Lab, Sun Yat-sen University, 510275, Guangzhou, P. R. China
| | - Jiyan Pang
- School of Chemistry, Sun Yat-sen University, 510275, Guangzhou, P. R. China
| | - Zixu Wang
- School of Chemistry, Sun Yat-sen University, 510275, Guangzhou, P. R. China
- PCFM Lab and GDHPRC Lab, Sun Yat-sen University, 510275, Guangzhou, P. R. China
| | - Zhixiu Sun
- School of Chemistry, Sun Yat-sen University, 510275, Guangzhou, P. R. China
- PCFM Lab and GDHPRC Lab, Sun Yat-sen University, 510275, Guangzhou, P. R. China
| | - Aiyun Peng
- School of Chemistry, Sun Yat-sen University, 510275, Guangzhou, P. R. China
| | - Xiaohui Cao
- School of Pharmacy, Guangdong Pharmaceutical University, 510006, Guangzhou, P. R. China
| | - Le Li
- School of Chemistry, Sun Yat-sen University, 510275, Guangzhou, P. R. China
- PCFM Lab and GDHPRC Lab, Sun Yat-sen University, 510275, Guangzhou, P. R. China
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Namioka R, Suzuki M, Yoshida S. Synthesis of 1,2,3-triazoles using Grignard reactions through the protection of azides. Front Chem 2023; 11:1237878. [PMID: 37583567 PMCID: PMC10424848 DOI: 10.3389/fchem.2023.1237878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2023] [Accepted: 07/17/2023] [Indexed: 08/17/2023] Open
Abstract
An efficient method to prepare organomagnesium intermediates having a protected azido group is reported. Protection of azido groups with di-(tert-butyl)(4-(dimethylamino)phenylphosphine (amphos) and following iodine-magnesium exchange realized the preparation of organomagnesium intermediates, which served in the synthesis of diverse azides by transformation with various electrophiles followed by deprotection with elemental sulfur. Furthermore, click reactions of azides with alkynes enabled synthesizing a wide variety of 1,2,3-triazoles.
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Affiliation(s)
- Rina Namioka
- Department of Biological Science and Technology, Faculty of Advanced Engineering, Tokyo University of Science, Tokyo, Japan
| | - Minori Suzuki
- Department of Biological Science and Technology, Faculty of Advanced Engineering, Tokyo University of Science, Tokyo, Japan
- Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Suguru Yoshida
- Department of Biological Science and Technology, Faculty of Advanced Engineering, Tokyo University of Science, Tokyo, Japan
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Maegawa K, Tanimoto H, Onishi S, Tomohiro T, Morimoto T, Kakiuchi K. Taming the reactivity of alkyl azides by intramolecular hydrogen bonding: site-selective conjugation of unhindered diazides. Org Chem Front 2021. [DOI: 10.1039/d1qo01088c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The intramolecular hydrogen bonding in the α-azido secondary acetamides (α-AzSAs) enabled site-selective integration onto the diazide modular hubs even without steric hindrance.
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Affiliation(s)
- Koshiro Maegawa
- Division of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayamacho, Ikoma, Nara 630-0192, Japan
| | - Hiroki Tanimoto
- Division of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayamacho, Ikoma, Nara 630-0192, Japan
- Faculty of Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan
| | - Seiji Onishi
- Division of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayamacho, Ikoma, Nara 630-0192, Japan
| | - Takenori Tomohiro
- Faculty of Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan
| | - Tsumoru Morimoto
- Division of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayamacho, Ikoma, Nara 630-0192, Japan
| | - Kiyomi Kakiuchi
- Division of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayamacho, Ikoma, Nara 630-0192, Japan
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