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Chen Y, Zhang S, Li Y, Li T, Ma Q, Yuan Y, Jia X. CBr 4 as a Mild Oxidant-Enabled Oxidation of a sp 3 C-H Bond: A Facile Synthesis of the Persistent Iminium Salts of Tetrahydroisoquinolines. Chemistry 2024; 30:e202303952. [PMID: 38193608 DOI: 10.1002/chem.202303952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 12/26/2023] [Accepted: 01/04/2024] [Indexed: 01/10/2024]
Abstract
Using CBr4 as a mild oxidant, the direct C-H bond oxidation of N-aryltetrahydroisoquinolines was achieved, giving a series of the corresponding iminium salts in high yields under metal- and photo-free reaction conditions. This reaction is superior in high yields and good functional group tolerance, and the late-stage derivatization showed that these iminium salts can readily be applied to the synthesis of the functionalized THIQs.
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Affiliation(s)
- Yuqin Chen
- School of Chemistry and Chemical Engineering, Yangzhou University, Siwangting Road 180, Yangzhou, Jiangsu, China, 225002
| | - Shuwei Zhang
- School of Chemistry and Chemical Engineering, Yangzhou University, Siwangting Road 180, Yangzhou, Jiangsu, China, 225002
| | - Yuemei Li
- School of Chemistry and Chemical Engineering, Yangzhou University, Siwangting Road 180, Yangzhou, Jiangsu, China, 225002
| | - Tong Li
- School of Chemistry and Chemical Engineering, Yangzhou University, Siwangting Road 180, Yangzhou, Jiangsu, China, 225002
| | - Qiyuan Ma
- School of Chemistry and Chemical Engineering, Yangzhou University, Siwangting Road 180, Yangzhou, Jiangsu, China, 225002
| | - Yu Yuan
- School of Chemistry and Chemical Engineering, Yangzhou University, Siwangting Road 180, Yangzhou, Jiangsu, China, 225002
| | - Xiaodong Jia
- School of Chemistry and Chemical Engineering, Yangzhou University, Siwangting Road 180, Yangzhou, Jiangsu, China, 225002
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Silica gel-promoted synthesis of amide by rearrangement of oxime under visible light. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.154286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Zhu Y, Ehnbom A, Fiedler T, Shu Y, Bhuvanesh N, Hall MB, Gladysz JA. Platinum(II) alkyl complexes of chelating dibridgehead diphosphines P((CH 2) n) 3P ( n = 14, 18, 22); facile cis/ trans isomerizations interconverting gyroscope and parachute like adducts. Dalton Trans 2021; 50:12457-12477. [PMID: 34545894 DOI: 10.1039/d1dt02321g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The gyroscope like dichloride complexes trans-Pt(Cl)2(P((CH2)n)3P) (trans-2; n = c, 14; e, 18; g, 22) and MeLi (2 equiv.) react to yield the parachute like dimethyl complexes cis-Pt(Me)2(P((CH2)n)3P) (cis-4c,e,g, 70-91%). HCl (1 equiv.) and cis-4c react to give cis-Pt(Cl)(Me)(P((CH2)14)3P) (cis-5c, 83%), which upon stirring with silica gel or crystallization affords trans-5c (89%). Similar reactions of HCl and cis-4e,g give cis/trans-5e,g mixtures that upon stirring with silica gel yield trans-5e,g. A parallel sequence with trans-2c/EtLi gives cis-Pt(Et)2(P((CH2)14)3P) (cis-6c, 85%) but subsequent reaction with HCl affords trans-Pt(Cl)(Et)(P((CH2)14)3P) (trans-7c, 45%) directly. When previously reported cis-Pt(Ph)2(P((CH2)14)3P) is treated with HCl (1 equiv.), cis- and trans-Pt(Cl)(Ph)(P((CH2)14)3P) are isolated (44%, 29%), with the former converting to the latter at 100 °C. Reactions of trans-5c and LiBr or NaI afford the halide complexes trans-Pt(X)(Me)(P((CH2)14)3P) (trans-9c, 88%; trans-10c, 87%). Thermolyses and DFT calculations that include acyclic model compounds establish trans > cis stabilities for all except the dialkyl complexes, for which energies can be closely spaced. The σ donor strengths of the non-phosphine ligands are assigned key roles in the trends. The crystal structures of cis-4c, trans-5c, trans-7c, and trans-10c are determined and analyzed together with the computed structures.
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Affiliation(s)
- Yun Zhu
- Department of Chemistry, Texas A&M University, PO Box 30012, College Station, Texas 77842-3012, USA.
| | - Andreas Ehnbom
- Department of Chemistry, Texas A&M University, PO Box 30012, College Station, Texas 77842-3012, USA.
| | - Tobias Fiedler
- Department of Chemistry, Texas A&M University, PO Box 30012, College Station, Texas 77842-3012, USA.
| | - Yi Shu
- Department of Chemistry, Texas A&M University, PO Box 30012, College Station, Texas 77842-3012, USA.
| | - Nattamai Bhuvanesh
- Department of Chemistry, Texas A&M University, PO Box 30012, College Station, Texas 77842-3012, USA.
| | - Michael B Hall
- Department of Chemistry, Texas A&M University, PO Box 30012, College Station, Texas 77842-3012, USA.
| | - John A Gladysz
- Department of Chemistry, Texas A&M University, PO Box 30012, College Station, Texas 77842-3012, USA.
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