|
1
|
Kim S, Park B, Lee GS, Hong SH. Synthesis of α-Aminoacetals via Decarboxylative Coupling of Imine and 2,2,-Diethoxyacetic Acid. J Org Chem 2022; 88:6532-6537. [DOI: 10.1021/acs.joc.2c01941] [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)
- Seoksun Kim
- Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 08826, Republic of Korea
| | - Beomsoon Park
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Geun Seok Lee
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Soon Hyeok Hong
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| |
Collapse
|
|
2
|
Fujioka H. Development of New Innovative Synthetic Organic Chemistry Using Lone Pairs of Oxygen Atoms. Chem Pharm Bull (Tokyo) 2020; 68:907-945. [PMID: 32999145 DOI: 10.1248/cpb.c20-00178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Oxygen atoms have a lone pair of electrons, so they have high chelation ability, high nucleophilic ability, stabilizing ability of adjacent cations, and take a chelate or oxocarbenium ion structure with Lewis acids and metals. I took advantage of these properties to develop three new reactions, 1) asymmetric synthesis of chiral quaternary carbon centers, 2) asymmetric synthesis using acetal functions, and 3) organic chemistry using acetal-type reactive salt chemical species, and applied them to biologically active natural products synthesis. New reactions described here are all innovative and useful for natural products synthesis. In particular, the first asymmetric synthesis of fredericamycin A, and concise asymmetric synthesis of anthracycline antibiotics, scyphostatin, (+)-Sch 642305, (-)-stenine, clavolonine, (+)-rubrenolide, (+)-rubrynolide, (+)-centrolobine, and decytospolide A and B, etc., are noteworthy. Furthermore, since reactions using acetal-type reactive salt chemical species allow the coexistence of functional groups that normally cannot coexist, the reactions using reactive salts have potential to change the retrosynthesis planned based on conventional reactions.
Collapse
Affiliation(s)
- Hiromichi Fujioka
- The Institute of Scientific and Industrial Research, Osaka University
| |
Collapse
|
|
3
|
Li H, Pan H, Meng X, Zhang X. Unique chemoselective Strecker-type reaction of acetals with TMSCN catalyzed by MgI 2 etherate. SYNTHETIC COMMUN 2020. [DOI: 10.1080/00397911.2019.1711413] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Hua Li
- College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou, Zhejiang, P. R. China
| | - Haokun Pan
- College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou, Zhejiang, P. R. China
| | - Xiangwei Meng
- College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou, Zhejiang, P. R. China
| | - Xingxian Zhang
- College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou, Zhejiang, P. R. China
| |
Collapse
|
|
4
|
Kawajiri T, Kato M, Nakata H, Goto R, Aibara SY, Ohta R, Fujioka H, Sajiki H, Sawama Y. Chemoselective Nucleophilic Functionalizations of Aromatic Aldehydes and Acetals via Pyridinium Salt Intermediates. J Org Chem 2019; 84:3853-3870. [DOI: 10.1021/acs.joc.8b02965] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Takahiro Kawajiri
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University, 1-25-4, Daigaku-nishi, Gifu 501-1196, Japan
| | - Maho Kato
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University, 1-25-4, Daigaku-nishi, Gifu 501-1196, Japan
| | - Hiroki Nakata
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University, 1-25-4, Daigaku-nishi, Gifu 501-1196, Japan
| | - Ryota Goto
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University, 1-25-4, Daigaku-nishi, Gifu 501-1196, Japan
| | - Shin-yo Aibara
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University, 1-25-4, Daigaku-nishi, Gifu 501-1196, Japan
| | - Reiya Ohta
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6, Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Hiromichi Fujioka
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6, Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Hironao Sajiki
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University, 1-25-4, Daigaku-nishi, Gifu 501-1196, Japan
| | - Yoshinari Sawama
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University, 1-25-4, Daigaku-nishi, Gifu 501-1196, Japan
| |
Collapse
|
|
5
|
Kawajiri T, Ohta R, Fujioka H, Sajiki H, Sawama Y. Aromatic aldehyde-selective aldol addition with aldehyde-derived silyl enol ethers. Chem Commun (Camb) 2018; 54:374-377. [DOI: 10.1039/c7cc08936h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Unprecedented chemoselectivity between aromatic and aliphatic aldehydes has been achieved in the Mukaiyama aldol reaction using aldehyde-derived silyl enol ethers.
Collapse
Affiliation(s)
- Takahiro Kawajiri
- Laboratory of Organic Chemistry
- Gifu Pharmaceutical University 1-25-4
- Daigaku-nishi
- Gifu
- Japan
| | - Reiya Ohta
- Graduate School of Pharmaceutical Sciences
- Osaka University 1-6
- Yamada-oka
- Suita
- Japan
| | - Hiromichi Fujioka
- Graduate School of Pharmaceutical Sciences
- Osaka University 1-6
- Yamada-oka
- Suita
- Japan
| | - Hironao Sajiki
- Laboratory of Organic Chemistry
- Gifu Pharmaceutical University 1-25-4
- Daigaku-nishi
- Gifu
- Japan
| | - Yoshinari Sawama
- Laboratory of Organic Chemistry
- Gifu Pharmaceutical University 1-25-4
- Daigaku-nishi
- Gifu
- Japan
| |
Collapse
|
|
6
|
Yasukawa N, Kanie T, Kuwata M, Monguchi Y, Sajiki H, Sawama Y. Palladium on Carbon-Catalyzed Benzylic Methoxylation for Synthesis of Mixed Acetals and Orthoesters. Chemistry 2017; 23:10974-10977. [DOI: 10.1002/chem.201702278] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Indexed: 12/18/2022]
Affiliation(s)
- Naoki Yasukawa
- Laboratory of Organic Chemistry; Gifu Pharmaceutical University; 1-25-4 Daigaku-nishi Gifu 501-1196 Japan
| | - Takafumi Kanie
- Laboratory of Organic Chemistry; Gifu Pharmaceutical University; 1-25-4 Daigaku-nishi Gifu 501-1196 Japan
| | - Marina Kuwata
- Laboratory of Organic Chemistry; Gifu Pharmaceutical University; 1-25-4 Daigaku-nishi Gifu 501-1196 Japan
| | - Yasunari Monguchi
- Laboratory of Organic Chemistry; Gifu Pharmaceutical University; 1-25-4 Daigaku-nishi Gifu 501-1196 Japan
| | - Hironao Sajiki
- Laboratory of Organic Chemistry; Gifu Pharmaceutical University; 1-25-4 Daigaku-nishi Gifu 501-1196 Japan
| | - Yoshinari Sawama
- Laboratory of Organic Chemistry; Gifu Pharmaceutical University; 1-25-4 Daigaku-nishi Gifu 501-1196 Japan
| |
Collapse
|
|
7
|
Abstract
We present a mild way of converting secondary methyl ethers into ketones using calcium hypochlorite in aqueous acetonitrile with acetic acid as activator. The reaction is compatible with various oxygen- and nitrogen-containing functional groups and afforded the corresponding ketones in up to 98% yield. The use of this methodology could expand the application of the methyl group as a useful protecting group.
Collapse
Affiliation(s)
- Pieter J Gilissen
- Institute for Molecules and Materials, Radboud University , Heyendaalseweg 135, 6525 AJ Nijmegen, Netherlands
| | - Daniel Blanco-Ania
- Institute for Molecules and Materials, Radboud University , Heyendaalseweg 135, 6525 AJ Nijmegen, Netherlands
| | - Floris P J T Rutjes
- Institute for Molecules and Materials, Radboud University , Heyendaalseweg 135, 6525 AJ Nijmegen, Netherlands
| |
Collapse
|
|
8
|
Yasukawa N, Asai S, Kato M, Monguchi Y, Sajiki H, Sawama Y. Palladium on Carbon-Catalyzed Chemoselective Oxygen Oxidation of Aromatic Acetals. Org Lett 2016; 18:5604-5607. [DOI: 10.1021/acs.orglett.6b02833] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Naoki Yasukawa
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University, 1-25-4-Daigaku-nishi, Gifu 501-1196, Japan
| | - Shota Asai
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University, 1-25-4-Daigaku-nishi, Gifu 501-1196, Japan
| | - Maho Kato
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University, 1-25-4-Daigaku-nishi, Gifu 501-1196, Japan
| | - Yasunari Monguchi
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University, 1-25-4-Daigaku-nishi, Gifu 501-1196, Japan
| | - Hironao Sajiki
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University, 1-25-4-Daigaku-nishi, Gifu 501-1196, Japan
| | - Yoshinari Sawama
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University, 1-25-4-Daigaku-nishi, Gifu 501-1196, Japan
| |
Collapse
|
|
9
|
Fujioka H, Matsumoto N, Kuboki Y, Mitsukane H, Ohta R, Kimura T, Murai K. Beckmann Fragmentation and Successive Carbon–Carbon Bond Formation Using Grignard Reagents via Phosphonium Salt Intermediates. Chem Pharm Bull (Tokyo) 2016; 64:718-22. [DOI: 10.1248/cpb.c16-00006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
| | - Nao Matsumoto
- Graduate School of Pharmaceutical Sciences, Osaka University
| | - Yuichi Kuboki
- Graduate School of Pharmaceutical Sciences, Osaka University
| | | | - Reiya Ohta
- Graduate School of Pharmaceutical Sciences, Osaka University
| | - Takashi Kimura
- Graduate School of Pharmaceutical Sciences, Osaka University
| | - Kenichi Murai
- Graduate School of Pharmaceutical Sciences, Osaka University
| |
Collapse
|
|
10
|
Fujioka H, Matsumoto N, Ohta R, Yamakawa M, Shimizu N, Kimura T, Murai K. Organic synthesis based on the Beckmann fragmentation: generation of an electrophilic salt intermediate and successive C–C bond formation using Gilman reagents. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.03.089] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
|
11
|
Rodríguez-Gimeno A, Cuenca AB, Gil-Tomás J, Medio-Simón M, Olmos A, Asensio G. FeCl3·6H2O-Catalyzed Mukaiyama-Aldol Type Reactions of Enolizable Aldehydes and Acetals. J Org Chem 2014; 79:8263-70. [DOI: 10.1021/jo501498a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Alejandra Rodríguez-Gimeno
- Departamento
de Química Orgánica, Universidad de Valencia, Avda. Vicente Andrés
Estellés, s/n 46100 Burjassot, Valencia, Spain
| | - Ana B. Cuenca
- Departamento
de Química Orgánica, Universidad de Valencia, Avda. Vicente Andrés
Estellés, s/n 46100 Burjassot, Valencia, Spain
| | - Jesús Gil-Tomás
- Departamento
de Química Orgánica, Universidad de Valencia, Avda. Vicente Andrés
Estellés, s/n 46100 Burjassot, Valencia, Spain
| | - Mercedes Medio-Simón
- Departamento
de Química Orgánica, Universidad de Valencia, Avda. Vicente Andrés
Estellés, s/n 46100 Burjassot, Valencia, Spain
| | - Andrea Olmos
- Laboratorio
de Catálisis Homogénea, Unidad Asociada al CSIC, CIQSO-Centro
de Investigación en Química Sostenible, Universidad de Huelva, Campus El Carmen, 21007 Huelva, Spain
| | - Gregorio Asensio
- Departamento
de Química Orgánica, Universidad de Valencia, Avda. Vicente Andrés
Estellés, s/n 46100 Burjassot, Valencia, Spain
| |
Collapse
|
|
12
|
Chemoselective and Direct Functionalization of Methyl Benzyl Ethers and Unsymmetrical Dibenzyl Ethers by Using Iron Trichloride. Chemistry 2014; 20:2631-6. [DOI: 10.1002/chem.201303910] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Indexed: 11/07/2022]
|
|
13
|
Kutsumura N, Matsubara Y, Niwa K, Ito A, Saito T. One-Pot Method for Regioselective Bromination and Sequential Carbon-Carbon Bond-Forming Reactions of Allylic Alcohol Derivatives. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300173] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
|
14
|
Maegawa T, Fujioka H. Reaction via Pyridinium-type Salt Intermediate: Chemoselective Deprotection of Acetals in the Presence of Ketals and Nucleophilic Substitution. J SYN ORG CHEM JPN 2013. [DOI: 10.5059/yukigoseikyokaishi.71.694] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|