1
|
Pattanaik S, Kumar A, Gunanathan C. Cobalt-catalysed [1,2]-Wittig rearrangement of ethers to secondary alcohols. Chem Commun (Camb) 2023; 59:1853-1856. [PMID: 36722974 DOI: 10.1039/d2cc06937g] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Stable ethers are successfully transformed into secondary alcohols via C-O bond activation using a simple cobalt pincer catalyst. Mechanistic studies indicate the involvement of radical pairs, and their sequential recombination and the subsequent hydrolysis results in the formation of secondary alcohols.
Collapse
Affiliation(s)
- Sandip Pattanaik
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute, Bhubaneswar-752050, India.
| | - Anurag Kumar
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute, Bhubaneswar-752050, India.
| | - Chidambaram Gunanathan
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute, Bhubaneswar-752050, India.
| |
Collapse
|
2
|
Aitken RA, Harper AD, Inwood RA, Slawin AMZ. Access to Diarylmethanols by Wittig Rearrangement of ortho-, meta-, and para-Benzyloxy- N-Butylbenzamides. J Org Chem 2022; 87:4692-4701. [PMID: 35286089 PMCID: PMC9007461 DOI: 10.1021/acs.joc.1c03160] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
The N-butyl amide
group, CONHBu, has been found
to be an effective promoter of the [1,2]-Wittig rearrangement of aryl
benzyl ethers and thus allow the two-step synthesis of isomerically
pure substituted diarylmethanols starting from simple hydroxybenzoic
acid derivatives. The method is compatible with a wide range of functional
groups including methyl, methoxy, and fluoro, although not with nitro
and, unexpectedly, is applicable to meta as well
as ortho and para isomeric series.
Collapse
Affiliation(s)
- R Alan Aitken
- EaStCHEM School of Chemistry, University of St Andrews, North Haugh, St Andrews, Fife KY16 9ST, U.K
| | - Andrew D Harper
- EaStCHEM School of Chemistry, University of St Andrews, North Haugh, St Andrews, Fife KY16 9ST, U.K
| | - Ryan A Inwood
- EaStCHEM School of Chemistry, University of St Andrews, North Haugh, St Andrews, Fife KY16 9ST, U.K
| | - Alexandra M Z Slawin
- EaStCHEM School of Chemistry, University of St Andrews, North Haugh, St Andrews, Fife KY16 9ST, U.K
| |
Collapse
|
3
|
Glavač D, Gredičak M. Construction of chiral Betti base precursors containing a congested quaternary stereogenic center via chiral phosphoric acid-catalyzed arylation of isoindolinone-derived ketimines. NEW J CHEM 2022. [DOI: 10.1039/d2nj00493c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Synthesis of enantioenriched Betti base precursors containing a congested quaternary stereocenter.
Collapse
Affiliation(s)
- Danijel Glavač
- Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička c. 54, 10000 Zagreb, Croatia
| | - Matija Gredičak
- Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička c. 54, 10000 Zagreb, Croatia
| |
Collapse
|
4
|
Ye F, Xu Z, Xu LW. The Discovery of Multifunctional Chiral P Ligands for the Catalytic Construction of Quaternary Carbon/Silicon and Multiple Stereogenic Centers. Acc Chem Res 2021; 54:452-470. [PMID: 33375791 DOI: 10.1021/acs.accounts.0c00740] [Citation(s) in RCA: 53] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The development of highly effective chiral ligands is a key topic in enhancing the catalytic activity and selectivity in metal-catalyzed asymmetric synthesis. Traditionally, the difficulty of ligand synthesis, insufficient accuracy in controlling the stereoselectivity, and poor universality of the systems often become obstacles in this field. Using the concept of nonequivalent coordination to the metal, our group has designed and synthesized a series of new chiral catalysts to access various carbon/silicon and/or multiple stereogenic centers containing products with excellent chemo-, diastereo-, and enantioselectivity.In this Account, we summarize a series of new phosphine ligands with multiple stereogenic centers that have been developed in our laboratory. These ligands exhibited good to excellent performance in the transition-metal-catalyzed enantioselective construction of quaternary carbon/silicon and multiple stereogenic centers. In the first section, notable examples of the design and synthesis of new chiral ligands by non-covalent interaction-based multisite activation are described. The integrations of axial chirality, atom-centered chirality, and chiral anions and multifunctional groups into a single scaffold are individually highlighted, as represented by Ar-BINMOLs and their derivative ligands, HZNU-Phos, Fei-Phos, and Xing-Phos. In the second, third, and fourth sections, the enantioselective construction of quaternary carbon stereocenters, multiple stereogenic centers, and silicon stereogenic centers using our newly developed chiral ligands is summarized. These sections refer to detailed reaction information in the chiral-ligand-controlled asymmetric catalysis based on the concept of nonequivalent coordination with multisite activation. Accordingly, a wide array of transition metal and main-group metal catalysts has been applied to the enantioselective synthesis of chiral heterocycles, amino acid derivatives, cyclic ketones, alkenes, and organosilicon compounds bearing one to five stereocenters.This Account shows that this new model of multifunctional ligand-controlled catalysts exhibits excellent stereocontrol and catalytic efficiency, especially in a stereodivergent and atom-economical fashion. Furthermore, a brief mechanistic understanding of the origin of enantioselectivity from our newly developed chiral catalyst systems could inspire further development of new ligands and enhancement of enantioselective synthesis by asymmetric metal catalysis.
Collapse
Affiliation(s)
- Fei Ye
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education and Key Laboratory of Organosilicon Material Technology of Zhejiang Province, Hangzhou Normal University, Hangzhou 311121, P. R. China
| | - Zheng Xu
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education and Key Laboratory of Organosilicon Material Technology of Zhejiang Province, Hangzhou Normal University, Hangzhou 311121, P. R. China
| | - Li-Wen Xu
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education and Key Laboratory of Organosilicon Material Technology of Zhejiang Province, Hangzhou Normal University, Hangzhou 311121, P. R. China
| |
Collapse
|
5
|
|
6
|
Olyaei A, Sadeghpour M. Recent advances in the synthesis and synthetic applications of Betti base (aminoalkylnaphthol) and bis-Betti base derivatives. RSC Adv 2019; 9:18467-18497. [PMID: 35515249 PMCID: PMC9064815 DOI: 10.1039/c9ra02813g] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2019] [Revised: 02/14/2020] [Accepted: 05/30/2019] [Indexed: 11/21/2022] Open
Abstract
The multicomponent reaction between 2-naphthol, arylaldehydes and ammonia yields aminobenzylnaphthols in a process known as the Betti reaction, which was first uncovered at the beginning of the 20th century. Various methods have been reported for the synthesis of aminobenzylnaphthol (Betti base) and bis-Betti base derivatives using various types of naphthols, aromatic amines, heteroaromatic amines, and aliphatic and cyclic amines instead of ammonia or diamines and aliphatic and aromatic aldehydes or dialdehyde compounds under various conditions in recent years. The Betti reaction produces racemic and non-racemic aminobenzylnaphthol ligands. It is also clear that the most important area of application of the non-racemic aminonaphthols prepared in this manner is their use in asymmetric synthesis, either as chiral ligands or as chiral auxiliaries. The functional groups in these Mannich products offer many ring closure possibilities. Some of these products or the starting bifunctional compounds possess biological activity. Herein, we present a selection of the relevant studies on this topic.
Collapse
Affiliation(s)
- Abolfazl Olyaei
- Department of Chemistry, Payame Noor University (PNU) PO Box 19395-4697 Tehran Iran
| | - Mahdieh Sadeghpour
- Department of Chemistry, Takestan Branch, Islamic Azad University Takestan Iran
| |
Collapse
|
7
|
Nath SR, Joshi KA. Mechanistic investigation in the [1,4] and [1,2] Wittig rearrangement reactions: a DFT study. Phys Chem Chem Phys 2018; 20:21457-21473. [PMID: 30087956 DOI: 10.1039/c8cp01045e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The mechanistic pathways for the [1,4] and [1,2] Wittig rearrangements of 2-silyl-6-aryl-5,6-dihydro-(2H)-pyrans have been studied at the M06-2X/6-31+G(d,p), 6-311++G(d,p) and cc-pVTZ level of theory. The crucial C-O bond cleavage step in the mechanism has been analysed initially, using two model reactions covering aliphatic as well as cyclic allylic ethers. The barriers for the one-step as well as two-step pathways have been calculated and the mechanisms for both the [1,4] and [1,2] Wittig rearrangement reactions are predicted to occur through a two-step mode. An energetic analysis of the reaction pathways reveals that the [1,4]-rearrangement has a lower barrier than the [1,2]-Wittig rearrangement. The C-O cleavage transition state was found to have the highest barrier and is thus the rate determining transition state for all of the studied molecules. This is in agreement with the previously published experimental studies. The role of the allylic trimethylsilane group in the stabilization of the intermediate anions of the Wittig reactants has also been investigated while comparing it with the phenyl and allylic t-butyl groups through Natural Bond Orbital (NBO) calculations.
Collapse
Affiliation(s)
- Shilpa R Nath
- Department of Chemistry, Institute of Chemical Technology, Matunga, Mumbai 400019, India.
| | | |
Collapse
|
8
|
Huang JB, Bai XF, Li L, Zheng ZJ, Xu Z, Cui YM, Cao J, Xu LW. Transition-Metal-Free Oxidative C(sp 2 )-H Hydroxylation of Terpyridines: A HOMO-Raising Strategy for the Construction of a New Super-Stable Terpyridine Chromophores. Chemistry 2017; 23:4055-4059. [PMID: 28181312 DOI: 10.1002/chem.201605793] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Indexed: 12/16/2022]
Abstract
Direct functionalization of terpyridines is an increasingly important topic in the field of dyes and catalysis as well as supramolecular chemistry, but its synthesis and transformation is usually challenging. Herein, a HOMO-raising strategy is reported for the construction of a super-stable novel terpyridine chromophores, in which the selective oxidation of terpyridines at its 3-position was determined successfully to the synthesis of phenol-functionalization of terpyridines (TPyOHs) bearing a hydrogen bonding group. The corresponding TPyOHs displayed strong aggregation-induced emission and exhibited highly selective and visual detection of ZnII cation with a record green terpyridine-based luminophore with nanomolar sensitivity (125 nm).
Collapse
Affiliation(s)
- Jiang-Bo Huang
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, P. R. China
| | - Xing-Feng Bai
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, P. R. China
| | - Li Li
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, P. R. China
| | - Zhan-Jiang Zheng
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, P. R. China
| | - Zheng Xu
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, P. R. China
| | - Yu-Ming Cui
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, P. R. China
| | - Jian Cao
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, P. R. China
| | - Li-Wen Xu
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, P. R. China.,State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, P. R. China
| |
Collapse
|
9
|
Huang WS, Chen L, Zheng ZJ, Yang KF, Xu Z, Cui YM, Xu LW. Catalytic asymmetric bromochlorination of aromatic allylic alcohols promoted by multifunctional Schiff base ligands. Org Biomol Chem 2016; 14:7927-32. [DOI: 10.1039/c6ob01306f] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The aromatic bromochloroalcohols with two bromide/chloride-linked carbon-stereogenic centers were obtained in moderate to excellent regio- and enantioselectivities as well as good yields and chemoselectivities in the catalytic asymmetric bromochlorination of allylic alcohols.
Collapse
Affiliation(s)
- Wei-Sheng Huang
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education
- Hangzhou Normal University
- Hangzhou 311121
- P. R. China
| | - Li Chen
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education
- Hangzhou Normal University
- Hangzhou 311121
- P. R. China
| | - Zhan-Jiang Zheng
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education
- Hangzhou Normal University
- Hangzhou 311121
- P. R. China
| | - Ke-Fang Yang
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education
- Hangzhou Normal University
- Hangzhou 311121
- P. R. China
| | - Zheng Xu
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education
- Hangzhou Normal University
- Hangzhou 311121
- P. R. China
| | - Yu-Ming Cui
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education
- Hangzhou Normal University
- Hangzhou 311121
- P. R. China
| | - Li-Wen Xu
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education
- Hangzhou Normal University
- Hangzhou 311121
- P. R. China
- State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical Physics
| |
Collapse
|
10
|
Xu Z, Xu LW. Development of Ar-BINMOL-Derived Atropisomeric Ligands with Matched Axial and sp3Central Chirality for Catalytic Asymmetric Transformations. CHEM REC 2015; 15:925-48. [PMID: 26400411 DOI: 10.1002/tcr.201500208] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2015] [Indexed: 01/05/2023]
Affiliation(s)
- Zheng Xu
- Key Laboratory of Organosilicon Chemistry and Material Technology of the Ministry of Education; Hangzhou Normal University; No. 1378, Wenyi West Road Hangzhou P. R. China
| | - Li-Wen Xu
- Key Laboratory of Organosilicon Chemistry and Material Technology of the Ministry of Education; Hangzhou Normal University; No. 1378, Wenyi West Road Hangzhou P. R. China
- State Key Laboratory for Oxo Synthesis and Selective Oxidation; Lanzhou Institute of Chemical Physics; Chinese Academy of Sciences (CAS); No. 18, Tianshui Road Lanzhou P. R. China
| |
Collapse
|
11
|
Dong C, Song T, Bai XF, Cui YM, Xu Z, Xu LW. Enantioselective conjugate addition of cyanide to chalcones catalyzed by a magnesium-Py-BINMOL complex. Catal Sci Technol 2015. [DOI: 10.1039/c5cy01056j] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient asymmetric conjugate addition of trimethylsilyl cyanide (TMSCN) to chalcones, catalyzed by bifunctional Py-BINMOL-Mg complex, with moderate to good enantioselectivities and in good yields, has been realized in this work.
Collapse
Affiliation(s)
- Cheng Dong
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, and College of Material
- Chemistry and Chemical Engineering
- Hangzhou Normal University
- Hangzhou 310012
- PR China
| | - Tao Song
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, and College of Material
- Chemistry and Chemical Engineering
- Hangzhou Normal University
- Hangzhou 310012
- PR China
| | - Xing-Feng Bai
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, and College of Material
- Chemistry and Chemical Engineering
- Hangzhou Normal University
- Hangzhou 310012
- PR China
| | - Yu-Ming Cui
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, and College of Material
- Chemistry and Chemical Engineering
- Hangzhou Normal University
- Hangzhou 310012
- PR China
| | - Zheng Xu
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, and College of Material
- Chemistry and Chemical Engineering
- Hangzhou Normal University
- Hangzhou 310012
- PR China
| | - Li-Wen Xu
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, and College of Material
- Chemistry and Chemical Engineering
- Hangzhou Normal University
- Hangzhou 310012
- PR China
| |
Collapse
|