1
|
Singh B, Kumar M, Goswami G, Verma I, Ghorai MK. Ring-Opening Cyclization (ROC) of Aziridines with Propargyl Alcohols: Synthesis of 3,4-Dihydro-2 H-1,4-oxazines. J Org Chem 2023; 88:4504-4518. [PMID: 36972376 DOI: 10.1021/acs.joc.2c03093] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
Abstract
Activated aziridines react with propargyl alcohols in the presence of Zn(OTf)2 as the Lewis acid catalyst following an SN2-type ring-opening mechanism to furnish the corresponding amino ether derivatives. Those amino ethers further undergo intramolecular hydroamination via 6-exo-dig cyclization in the presence of Zn(OTf)2 as the catalyst and tetrabutylammonium triflate salt as an additive under one-pot two-step reaction conditions. However, for nonracemic examples, ring-opening and cyclization steps were conducted under two-pot conditions. The reaction works well without any additional solvents. The final 3,4-dihydro-2H-1,4-oxazine products were obtained with 13 to 84% yield and 78 to 98% enantiomeric excess (for nonracemic examples).
Collapse
Affiliation(s)
- Bharat Singh
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
| | - Manish Kumar
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
| | - Gaurav Goswami
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
| | - Indresh Verma
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
| | - Manas K Ghorai
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
| |
Collapse
|
2
|
Hidalgo N, Romero-Pérez C, Maya C, Fernández I, Campos J. Reactivity of [Pt(P t Bu 3) 2] with Zinc(I/II) Compounds: Bimetallic Adducts, Zn-Zn Bond Cleavage, and Cooperative Reactivity. Organometallics 2021; 40:1113-1119. [PMID: 34602699 PMCID: PMC8479860 DOI: 10.1021/acs.organomet.1c00088] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Indexed: 11/30/2022]
Abstract
Metal-only Lewis pairs (MOLPs) based on zinc electrophiles are particularly interesting due to their relevance to Negishi cross-coupling reactions. Zinc-based ligands in bimetallic complexes also render unique reactivity to the transition metals at which they are bound. Here we explore the use of sterically hindered [Pt(P t Bu3)2] (1) to access Pt/Zn bimetallic complexes. Compounds [(P t Bu3)2Pt → Zn(C6F5)2] (2) and [Pt(ZnCp*)6] (3) (Cp* = pentamethylcyclopentadienyl) were isolated by reactions with Zn(C6F5)2 and [Zn2Cp*2], respectively. We also disclose the cooperative reactivity of 1/ZnX2 pairs (X = Cl, Br, I, and OTf) toward water and dihydrogen, which can be understood in terms of bimetallic frustration.
Collapse
Affiliation(s)
- Nereida Hidalgo
- Instituto
de Investigaciones Químicas (IIQ), Departamento de Química
Inorgánica and Centro de Innovación en Química
Avanzada (ORFEO−CINQA), Consejo Superior
de Investigaciones Científicas (CSIC) and University of Sevilla, Avenida Américo Vespucio
49, 41092 Sevilla, Spain
| | - Carlos Romero-Pérez
- Instituto
de Investigaciones Químicas (IIQ), Departamento de Química
Inorgánica and Centro de Innovación en Química
Avanzada (ORFEO−CINQA), Consejo Superior
de Investigaciones Científicas (CSIC) and University of Sevilla, Avenida Américo Vespucio
49, 41092 Sevilla, Spain
| | - Celia Maya
- Instituto
de Investigaciones Químicas (IIQ), Departamento de Química
Inorgánica and Centro de Innovación en Química
Avanzada (ORFEO−CINQA), Consejo Superior
de Investigaciones Científicas (CSIC) and University of Sevilla, Avenida Américo Vespucio
49, 41092 Sevilla, Spain
| | - Israel Fernández
- Departamento
de Química Orgánica I and Centro de Innovación
en Química Avanzada (ORFEO−CINQA), Facultad de Ciencias
Químicas, Universidad Complutense
de Madrid, Madrid 28040, Spain
| | - Jesús Campos
- Instituto
de Investigaciones Químicas (IIQ), Departamento de Química
Inorgánica and Centro de Innovación en Química
Avanzada (ORFEO−CINQA), Consejo Superior
de Investigaciones Científicas (CSIC) and University of Sevilla, Avenida Américo Vespucio
49, 41092 Sevilla, Spain
| |
Collapse
|
3
|
Chen Z, Nie XD, Sun JT, Yang AM, Wei BG. Zn(OTf) 2-catalyzed hydroamination of ynamides with aromatic amines. Org Biomol Chem 2021; 19:2492-2501. [PMID: 33656504 DOI: 10.1039/d0ob02603d] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The Zn(OTf)2-catalyzed hydroamination of ynamides 2a-2l with aromatic amines 1a-1r was developed. This protocol features broad substrate scope of aromatic amines, good functional group tolerance for ynamides, and excellent regioselectivities. As a result, a variety of substituted amidine compounds 3aa-3oa, 3ab-3al and 3pa-3rk were prepared in moderate to excellent yields and with high regioselectivities.
Collapse
Affiliation(s)
- Zhuo Chen
- School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China.
| | | | | | | | | |
Collapse
|
4
|
Gu X, Ma P, Liu P, Wang R, Li X, Zheng Z. Visible-light-driven Hydroamination of Alkynes over a New Type of Activated Carbon Immobilized Cu2+ Photocatalyst. Chem Res Chin Univ 2020. [DOI: 10.1007/s40242-020-0166-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
5
|
Prybil J, Wallace R, Warren A, Klingman J, Vaillant R, Hall MB, Yang X, Brennessel WW, Chin RM. Silylation of Pyridine, Picolines, and Quinoline with a Zinc Catalyst. ACS OMEGA 2020; 5:1528-1539. [PMID: 32010826 PMCID: PMC6990635 DOI: 10.1021/acsomega.9b03317] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Accepted: 12/30/2019] [Indexed: 06/10/2023]
Abstract
Zn(OTf)2 (OTf- = trifluoromethanesulfonate) catalyzes the silylation of pyridine, 3-picoline, and quinoline to afford the silylated products, where the silyl groups are meta to the nitrogen. The isolated yields of the products range from 41 to 26%. The 2- and 4-picolines yielded the silylmethylpyridines, where the CH3 groups were silylated instead of the ring. The pyridine silylation can occur via two separate pathways, involving either a 1,4- or a 1,2-hydrosilylation of pyridine as the first step. A byproduct of the pyridine silylation is a head-to-tail dimerization of N-silyl-1,4-dihydropyridine to form a diazaditwistane molecule.
Collapse
Affiliation(s)
- Joshua
W. Prybil
- Department
of Chemistry and Biochemistry, University
of Northern Iowa, Cedar
Falls, Iowa 50614-0423, United States
| | - Rodney Wallace
- Department
of Chemistry and Biochemistry, University
of Northern Iowa, Cedar
Falls, Iowa 50614-0423, United States
| | - Alexandra Warren
- Department
of Chemistry and Biochemistry, University
of Northern Iowa, Cedar
Falls, Iowa 50614-0423, United States
| | - Jordan Klingman
- Department
of Chemistry and Biochemistry, University
of Northern Iowa, Cedar
Falls, Iowa 50614-0423, United States
| | - Romane Vaillant
- École
nationale supérieure de chimie de Rennes, Sciences Chimiques
de Rennes, Rennes, Bretagne 35700, France
| | - Michael B. Hall
- Department
of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Xin Yang
- Department
of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - William W. Brennessel
- Department
of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - Robert M. Chin
- Department
of Chemistry and Biochemistry, University
of Northern Iowa, Cedar
Falls, Iowa 50614-0423, United States
| |
Collapse
|
6
|
Singh R, Kociok-Köhn G, Singh K, Pandey SK, Singh L. Influence of ligand coordination, solvent, and non-covalent interaction on the structural outcomes in coordination polymers with direct Cd(II)-alkanesulfonate bonds: A combined experimental and computational study. J SOLID STATE CHEM 2019. [DOI: 10.1016/j.jssc.2019.120992] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
7
|
Antiradical, antimicrobial and enzyme inhibition evaluation of sulfonamide derived esters; synthesis, X-Ray analysis and DFT studies. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2018.07.116] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
8
|
Das S, Bhattacharjee J, Panda TK. An imidazolin-2-iminato ligand organozinc complex as a catalyst for hydroboration of organic nitriles. NEW J CHEM 2019. [DOI: 10.1039/c9nj04076e] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Catalytic hydroboration of nitriles with pinacolborane (HBpin) using the imidazolin-2-iminato zinc alkyl complex [{(ImtBuN)Zn(CH2CH3)}2] (1c) under mild and solvent-free conditions to afford corresponding diboronate esters in high yield is reported.
Collapse
Affiliation(s)
- Suman Das
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Sangareddy 502285
- India
| | - Jayeeta Bhattacharjee
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Sangareddy 502285
- India
| | - Tarun K. Panda
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Sangareddy 502285
- India
| |
Collapse
|
9
|
The Importance of CH···X (X = O, π) Interaction of a New Mixed Ligand Cu(II) Coordination Polymer: Structure, Hirshfeld Surface and Theoretical Studies. CRYSTALS 2018. [DOI: 10.3390/cryst8120455] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In this study, a new equimolar (1:1:1) mixed ligand Cu(II) polymer, [Cu(IDA)(ImP)]n (1) with iminodiacetato (IDA) and imidazo[1,2-a]-pyridine (ImP) was synthesized and characterized by single crystal X-ray diffraction analysis. X-ray crystallography reveals that compound (1) consists of polymeric zigzag chain along [010] the carboxylate carbonyl oxygen atom by two-fold symmetry screw axis. The solid-state structure is stabilized through C–H···O hydrogen bonds and C–H···π interactions that lead the molecules to generate two-dimensional supramolecular assemblies. The intricate combinations of hydrogen bonds and C–H···π interactions are fully described along with computational studies. A thorough analysis of Hirshfeld surface and fingerprint plots elegantly quantify the interactions involved within the structure. The binding energies associated with the noncovalent interactions observed in the crystal structure and the interplay between them were calculated using theoretical DFT calculations. Weak noncovalent interactions were analyzed and characterized using Bader’s theory of ‘‘atoms-in-molecules’’ (AIM). Finally, the solid-state supramolecular assembly was characterized by the “Noncovalent Interaction” (NCI) plot index.
Collapse
|
10
|
Whittaker T, Kumar KBS, Peterson C, Pollock MN, Grabow LC, Chandler BD. H2 Oxidation over Supported Au Nanoparticle Catalysts: Evidence for Heterolytic H2 Activation at the Metal–Support Interface. J Am Chem Soc 2018; 140:16469-16487. [DOI: 10.1021/jacs.8b04991] [Citation(s) in RCA: 79] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Todd Whittaker
- Department of Chemistry, Trinity University, San Antonio, Texas 78212-7200, United States
| | - K. B. Sravan Kumar
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, United States
| | - Christine Peterson
- Department of Chemistry, Trinity University, San Antonio, Texas 78212-7200, United States
| | - Meagan N. Pollock
- Department of Chemistry, Trinity University, San Antonio, Texas 78212-7200, United States
| | - Lars C. Grabow
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, United States
| | - Bert D. Chandler
- Department of Chemistry, Trinity University, San Antonio, Texas 78212-7200, United States
| |
Collapse
|