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Yaragorla S, Sneha Latha D, Kumar R. Mechanochemical Regioselective [3+3] Annulation of 6-Amino Uracil with Propargyl Alcohols Catalyzed by a Brønsted Acid/Hexafluoroisopropanol. Chemistry 2024; 30:e202401480. [PMID: 38727792 DOI: 10.1002/chem.202401480] [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: 04/16/2024] [Indexed: 06/19/2024]
Abstract
A mechanochemistry approach is developed for regioselective synthesis of functionalized dihydropyrido[2,3-d]pyrimidines by milling propargylic alcohols and 6-aminouracils with HFIP/p-TsOH. In the case of tert-propargyl alcohols, this [3+3] cascade annulation proceeded through allenylation of uracil followed by a 6-endo trig cyclization. With sec-propargyl alcohols, the reaction furnished the propargylation of uracil. This atom economy ball milling reaction allows access to a broad range of dihydropyrido[2,3-d]pyrimidine derivatives in excellent yields. We demonstrated the gram scale synthesis of 3 g and post-synthetic modifications to effect the cyclization of 5 to 6.
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Affiliation(s)
- Srinivasarao Yaragorla
- University of Hyderabad (an Institute of Eminence), P.O. Central University, Gachibowli, 500046, Hyderabad, Telangana State, India
| | - Dandugula Sneha Latha
- University of Hyderabad (an Institute of Eminence), P.O. Central University, Gachibowli, 500046, Hyderabad, Telangana State, India
| | - Rituraj Kumar
- University of Hyderabad (an Institute of Eminence), P.O. Central University, Gachibowli, 500046, Hyderabad, Telangana State, India
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Prieto E, Martín JD, Nieto J, Andrés C. Enantioselective synthesis of 3-hydroxy- and 3-amino-3-alkynyl-2-oxindoles by the dimethylzinc-mediated addition of terminal alkynes to isatins and isatin-derived ketimines. Org Biomol Chem 2023; 21:6940-6948. [PMID: 37581278 DOI: 10.1039/d3ob01023f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/16/2023]
Abstract
A common protocol for enantioselective alkynylation of isatins and isatin-derived ketimines using terminal alkynes and Me2Zn in the presence of a catalytic amount of a chiral perhydro-1,3-benzoxazine with moderate to excellent enantioselectivity under mild reaction conditions is described. The additions to ketimines present a novel approach to chiral amines being derivatives of oxindoles. The reaction is broad in scope with respect to aryl- and alkyl-substituted terminal alkynes and isatin derivatives. In isatins, the alkynylation occurs at the Si face of the carbonyl group, whereas in the ketimine derivatives it occurs at the Re face of the imine.
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Affiliation(s)
- Elena Prieto
- Instituto CINQUIMA and Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Valladolid, Paseo de Belén, 7, 47011 Valladolid, Spain.
| | - Jorge D Martín
- Instituto CINQUIMA and Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Valladolid, Paseo de Belén, 7, 47011 Valladolid, Spain.
| | - Javier Nieto
- Instituto CINQUIMA and Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Valladolid, Paseo de Belén, 7, 47011 Valladolid, Spain.
| | - Celia Andrés
- Instituto CINQUIMA and Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Valladolid, Paseo de Belén, 7, 47011 Valladolid, Spain.
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Cai Z, Feng X, Zhang Y, Lu C, Han Y, Zhao J. Transition‐Metal‐Free
Catalyzed Dehydrative Coupling of Quinoline and Isoquinoline
N
‐Oxides
with Propargylic Alcohols. CHINESE J CHEM 2022. [DOI: 10.1002/cjoc.202100687] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Zhao‐Nan Cai
- School of Chemical Engineering and Technology, Hebei University of Technology Tianjin 300130 China
| | - Xiang‐Xuan Feng
- School of Chemical Engineering and Technology, Hebei University of Technology Tianjin 300130 China
| | - Yuecheng Zhang
- School of Chemical Engineering and Technology, Hebei University of Technology Tianjin 300130 China
| | - Cong‐Cong Lu
- School of Chemical Engineering and Technology, Hebei University of Technology Tianjin 300130 China
| | - Ya‐Ping Han
- School of Chemical Engineering and Technology, Hebei University of Technology Tianjin 300130 China
| | - Jiquan Zhao
- School of Chemical Engineering and Technology, Hebei University of Technology Tianjin 300130 China
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Khan T, Rajesh P, Arun D, Yaragorla S. Stereoselective sulfenylation of oxindole-derived propargyl alcohols to access sulfenylated-3-alkenyloxindoles. Org Biomol Chem 2021; 19:10201-10209. [PMID: 34792078 DOI: 10.1039/d1ob01921j] [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
A Ca-catalyzed, tetrasubstituted alkenyl-sulfenylation was achieved using readily available aryl/alkyl thiols and easily prepared oxindole-derived propargyl alcohols under solvent-free conditions. The reaction proceeded with hydrogen bonding assisted regioselective α-thiolation and subsequent calcium catalyzed stereoselective alkenylation to yield E-alkenyl thioethers with high diastereoselectivity.
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Affiliation(s)
- Tabassum Khan
- School of Chemistry, University of Hyderabad, 500046, Telangana, India.
| | - Pallava Rajesh
- School of Chemistry, University of Hyderabad, 500046, Telangana, India.
| | - Doma Arun
- School of Chemistry, University of Hyderabad, 500046, Telangana, India.
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Wu ZY, Zhang ZW, Ding LL, Xiang M, Luo SY. Development of a novel octahedron rhodium complex and its application to the alkynylation of isatin derivatives. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.152577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Bai J, Yasumoto K, Kano T, Maruoka K. Asymmetric Synthesis of Chiral 1,4‐Enynes through Organocatalytic Alkenylation of Propargyl Alcohols with Trialkenylboroxines. Angew Chem Int Ed Engl 2019; 58:8898-8901. [DOI: 10.1002/anie.201904520] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Indexed: 12/14/2022]
Affiliation(s)
- Jian‐Fei Bai
- Department of ChemistryGraduate School of ScienceKyoto University, Sakyo Kyoto 606-8502 Japan
- Current address: Suzhou Research Institute of LICPLanzhou Institute of Chemical Physics (LICP)Chinese Academy of Sciences Lanzhou 730000 P. R. China
| | - Kento Yasumoto
- Department of ChemistryGraduate School of ScienceKyoto University, Sakyo Kyoto 606-8502 Japan
| | - Taichi Kano
- Department of ChemistryGraduate School of ScienceKyoto University, Sakyo Kyoto 606-8502 Japan
| | - Keiji Maruoka
- Department of ChemistryGraduate School of ScienceKyoto University, Sakyo Kyoto 606-8502 Japan
- School of Chemical Engineering and Light IndustryGuangdong University of Technology Guangzhou 510006 P. R. China
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Bai J, Yasumoto K, Kano T, Maruoka K. Asymmetric Synthesis of Chiral 1,4‐Enynes through Organocatalytic Alkenylation of Propargyl Alcohols with Trialkenylboroxines. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201904520] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Jian‐Fei Bai
- Department of ChemistryGraduate School of ScienceKyoto University, Sakyo Kyoto 606-8502 Japan
- Current address: Suzhou Research Institute of LICPLanzhou Institute of Chemical Physics (LICP)Chinese Academy of Sciences Lanzhou 730000 P. R. China
| | - Kento Yasumoto
- Department of ChemistryGraduate School of ScienceKyoto University, Sakyo Kyoto 606-8502 Japan
| | - Taichi Kano
- Department of ChemistryGraduate School of ScienceKyoto University, Sakyo Kyoto 606-8502 Japan
| | - Keiji Maruoka
- Department of ChemistryGraduate School of ScienceKyoto University, Sakyo Kyoto 606-8502 Japan
- School of Chemical Engineering and Light IndustryGuangdong University of Technology Guangzhou 510006 P. R. China
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Yaragorla S, Rajesh P, Pareek A, Kumar A. Ca(II)-Mediated Regioselective One-pot Sequential Annulation of Acyclic compounds to Polycyclic Fluorenopyrans. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201801030] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Srinivasarao Yaragorla
- School of Chemistry; University of Hyderabad; Prof. C. R. Rao Road, Gachibowli, Hyderabad 500046 India
| | - P. Rajesh
- School of Chemistry; University of Hyderabad; Prof. C. R. Rao Road, Gachibowli, Hyderabad 500046 India
| | - Abhishek Pareek
- School of Chemistry; University of Hyderabad; Prof. C. R. Rao Road, Gachibowli, Hyderabad 500046 India
| | - Ankit Kumar
- School of Chemistry; University of Hyderabad; Prof. C. R. Rao Road, Gachibowli, Hyderabad 500046 India
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Yaragorla S, Dada R, Rajesh P, Sharma M. Highly Regioselective Synthesis of Oxindolyl-Pyrroles and Quinolines via a One-Pot, Sequential Meyer-Schuster Rearrangement, Anti-Michael Addition/C (sp3)-H Functionalization, and Azacyclization. ACS OMEGA 2018; 3:2934-2946. [PMID: 30023853 PMCID: PMC6044873 DOI: 10.1021/acsomega.8b00147] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Accepted: 02/27/2018] [Indexed: 06/08/2023]
Abstract
A one-pot, sequential Meyer-Schuster (MS) rearrangement of oxindole-derived propargyl alcohols to the corresponding α,β-unsaturated enones and their anti-Michael addition, followed by intramolecular azacyclization is described in a highly regioselective manner using Ca(OTf)2 as the promoter. Further, we described the one-pot MS rearrangement, followed by C(sp3)-H functionalization of 2-methyl azaarenes at α-carbon of these doubly activated alkenes. Control experiments and computational calculations were performed to propose the reaction mechanism.
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Raţ CI, Soran A, Varga RA, Silvestru C. C–H Bond Activation Mediated by Inorganic and Organometallic Compounds of Main Group Metals. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2018. [DOI: 10.1016/bs.adomc.2018.07.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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