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Sung S, Joachim T, Krämer T, Young RD. Protonolysis of an α-Hydroxyl Ligand for the Generation of a PCcarbeneP Pincer Complex and Subsequent Reactivity Studies. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00461] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Simon Sung
- Department
of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Timothy Joachim
- Department
of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Tobias Krämer
- Institute
of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
| | - Rowan D. Young
- Department
of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
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2
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Tsai SH, Lin YC, Liu YH. Reactions of Ruthenium Complexes Containing Pentatetraenylidene Ligand. Chem Asian J 2016; 11:3072-3083. [PMID: 27617893 DOI: 10.1002/asia.201601045] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Indexed: 11/12/2022]
Abstract
Two ruthenium acetylide complexes [Ru]-C≡C-C≡C-C(OR)(C3 H5 )2 (2, R=H and 2 a, R=CH3 ; [Ru]=Cp(PPh3 )2 Ru) each with two cyclopropyl rings were synthesized from TMS-C≡C-C≡C-C(OH)(C3 H5 )2 (1; TMS=trimethylsilyl). Treatments of 2 and 2 a with allyl halide in the presence of KPF6 afforded the vinylidene complexes 3 and 3 a, respectively. When NH4 PF6 was used, instead of KPF6 , additional ring-opening reaction took place on one of the three-membered ring. Treatment of [Ru]Cl with 1,3-butadiyne (6), bearing an epoxide ring, afforded acetylide complex 7 with a furyl ring. Treatment of 2 a with Ph3 CPF6 presumably afforded pentatetraenylidene complex {[Ru]=C=C=C=C=C(C3 H5 )2 }[PF6 ] (10), which was not isolated. Additions of various alcohols in a solution of 10 generated a number of disubstituted allenylidene complexes {[Ru]=C=C=C(OR)-C=C(C3 H5 )2 }[PF6 ] (11). Treatment of 11 with K2 CO3 afforded the acetylide complex 12 bearing a carbonyl group, characterized by single X-ray diffraction analysis. Addition of a primary amine to 10 caused cleavage of the farthermost C=C bond and several allenylidene complexes {[Ru]=C=C=C(Me)(NHR)}[PF6 ] (18) were isolated.
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Affiliation(s)
- Shih-Hung Tsai
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan
| | - Ying-Chih Lin
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan
| | - Yi-Hung Liu
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan
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Chia PY, Huang SL, Liu YH, Lin YC. Reactions of a Ruthenium Complex with Substituted N-Propargyl Pyrroles. Chem Asian J 2016; 11:1098-106. [PMID: 26865008 DOI: 10.1002/asia.201600074] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Revised: 02/05/2016] [Indexed: 01/23/2023]
Abstract
In an investigation into the chemical reactions of N-propargyl pyrroles 1 a-c, containing aldehyde, keto, and ester groups on the pyrrole ring, with [Ru]-Cl ([Ru]=Cp(PPh3 )2 Ru; Cp=C5 H5 ), an aldehyde group in the pyrrole ring is found to play a crucial role in stimulating the cyclization reaction. The reaction of 1 a, containing an aldehyde group, with [Ru]-Cl in the presence of NH4 PF6 yields the vinylidene complex 2 a, which further reacts with allyl amine to give the carbene complex 6 a with a pyrrolizine group. However, if 1 a is first reacted with allyl amine to yield the iminenyne 8 a, then the reaction of 8 a with [Ru]-Cl in the presence of NH4 PF6 yields the ruthenium complex 9 a, containing a cationic pyrrolopyrazinium group, which has been fully characterized by XRD analysis. These results can be adequately explained by coordination of the triple bond of the propargyl group to the ruthenium metal center first, followed by two processes, that is, formation of a vinylidene intermediate or direct nucleophilic attack. Additionally, the deprotonation of 2 a by R4 NOH yields the neutral acetylide complex 3 a. In the presence of NH4 PF6 , the attempted alkylation of 3 a resulted in the formation the Fischer-type amino-carbene complex 5 a as a result of the presence of NH3, which served as a nucleophile. With KPF6, the alkylation of 3 a with ethyl and benzyl bromoacetates afforded the disubstituted vinylidene complexes 10 a and 11 a, containing ester groups, which underwent deprotonation reactions to give the furyl complexes 12 a and 13 a, respectively. For 13 a, containing an O-benzyl group, subsequent 1,3-migration of the benzyl group was observed to yield product 14 a with a lactone unit. Similar reactivity was not observed for the corresponding N-propargyl pyrroles 1 b and 1 c, which contained keto and ester groups, respectively, on the pyrrole ring.
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Affiliation(s)
- Pi-Yeh Chia
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan
| | - Shou-Ling Huang
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan
| | - Yi-Hong Liu
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan
| | - Ying-Chih Lin
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan.
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Feng YJ, Lai YH, Lin YC, Huang SL, Liu YH. Reactions of aromatic S- and O-enynes with two methyl substituents on the olefinic unit assisted by a ruthenium complex: tandem cyclization and product selectivity. Chem Asian J 2013; 9:602-11. [PMID: 24265173 DOI: 10.1002/asia.201301264] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2013] [Indexed: 11/10/2022]
Abstract
Ruthenium-assisted cyclizations of two enynes, HC≡CCH(OH)(C6H4)X-CH2CH=CMe2 (X=S (1a), O (1b)), each of which contains two terminal methyl substituents on the olefinic parts, are explored. The reaction of 1a in CH2Cl2 gives the vinylidene complex 2a from the first cyclization and two side products, 3a and the carbene complex 4a with a benzothiophene ligand. The same reaction in the presence of HBF4 affords 4a exclusively. Air oxidation of 4a in the presence of Et3N readily gives an aldehyde product. In MeOH, tandem cyclizations of 1a generate a mixture of the benzothiochromene compound 10a and the carbene complex 7a also with a benzothiochromene ligand. First, cyclization of 1b likewise proceeds in CH2Cl2 to give 2b. Tandem cyclization of 1b in MeOH yields comparable products 10b and 7b with benzochromene moieties, yet with no other side product. The reaction of [Ru]Cl with HC≡CCH(OH)(C6H4)S-CH2CH=CH2 (1c), which contains no methyl substituent in the olefinic part, in MeOH gives the carbene complex 15c with an unsubstituted thiochromene by means of a C-S bond formation. Structures of 3a and 15c are confirmed by X-ray diffraction analysis. The presence of methyl groups of enynes 1a and 1b promotes sequential cyclization reactions that involve C-C bond formation through carbocationic species.
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Affiliation(s)
- Yi-Jhen Feng
- Department of Chemistry, National Taiwan University, Taipei, 106 (Taiwan), Fax: (+886) 223636359
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Feng YJ, Lo JX, Lin YC, Huang SL, Wang Y, Liu YH. Tandem Cyclization of Enynes Containing a Thioether or Ether Linkage via Ruthenium Allenylidene and Vinylidene Complexes. Organometallics 2013. [DOI: 10.1021/om400742x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Yi-Jhen Feng
- Department
of Chemistry, National Taiwan University, Taipei, Taiwan 106, Republic of China
| | - Ji-Xian Lo
- Department
of Chemistry, National Taiwan University, Taipei, Taiwan 106, Republic of China
| | - Ying-Chih Lin
- Department
of Chemistry, National Taiwan University, Taipei, Taiwan 106, Republic of China
| | - Shou-Ling Huang
- Department
of Chemistry, National Taiwan University, Taipei, Taiwan 106, Republic of China
| | - Yu Wang
- Department
of Chemistry, National Taiwan University, Taipei, Taiwan 106, Republic of China
| | - Yi-Hung Liu
- Department
of Chemistry, National Taiwan University, Taipei, Taiwan 106, Republic of China
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Ma H, Chang W, Tsai F, Lin Y, Huang S, Liu Y, Wang Y. Intramolecular Cyclization of Arylalkynes with C‐O Bond Formation on Ruthenium Complexes. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.201300037] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Hao‐Wei Ma
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 106, Republic of China
| | - Wei‐Chen Chang
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 106, Republic of China
| | - Fu‐Yuan Tsai
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 106, Republic of China
| | - Ying‐Chih Lin
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 106, Republic of China
| | - Shou‐Ling Huang
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 106, Republic of China
| | - Yi‐Hong Liu
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 106, Republic of China
| | - Yu Wang
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 106, Republic of China
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Miyake Y, Endo S, Moriyama T, Sakata K, Nishibayashi Y. Ruthenium-Triggered Ring Opening of Ethynylcyclopropanes: [3+2] Cycloaddition with Aldehydes and Aldimines Involving Metal Allenylidene Intermediates. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201207801] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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8
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Miyake Y, Endo S, Moriyama T, Sakata K, Nishibayashi Y. Ruthenium-Triggered Ring Opening of Ethynylcyclopropanes: [3+2] Cycloaddition with Aldehydes and Aldimines Involving Metal Allenylidene Intermediates. Angew Chem Int Ed Engl 2013; 52:1758-62. [DOI: 10.1002/anie.201207801] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2012] [Revised: 11/01/2012] [Indexed: 12/11/2022]
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Chen CC, Cheng PC, Huang SL, Lin YC, Liu YH. Reactions of ruthenium-allenylidene complexes tethering a cyclopropyl group. Chem Asian J 2011; 6:3122-31. [PMID: 21853534 DOI: 10.1002/asia.201100297] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2011] [Indexed: 11/06/2022]
Abstract
Two cyclopropyl allenylidene complexes [Ru]=C=C=C(R)(C(3)H(5)) ([Ru]=[RuCp(PPh(3))(2)], Cp=Cyclopentadienyl; R=thiophene (2a) and R=Ph (2b)) are prepared from the reactions of [Ru]Cl with the corresponding 1-cyclopropyl-2-propyn-1-ol in the presence of KPF(6). Thermal treatment, halide-anion addition, and palladium-catalyzed reactions of 2a and 2b all lead to a ring expansion of the cyclopropyl group, giving the vinylidene complexes 4a and 4b, respectively, each with a five-membered ring. This ring expansion proceeds by C-C bond formation between Cβ of the cumulative double bond and a methylene group of the cyclopropyl ring. In the reaction of 2a with pyrrole, consecutive formation of two C-C bonds, one between C-2 of pyrrole and Cγ of 2a and the other between C-3 of pyrrole and Cα, results in the formation of 6a. The reaction proceeds by addition of pyrrole and 1,3-proton shifts. The hydrogenation of 2a by NaBH(4) is carried out in different solvents. The cumulative double bonds are reduced regioselectively to give a mixture of 7a and 8a. Interestingly, use of different solvents leads to different ratios of 7a and 8a. Presence of a protic solvent like methanol in dichloromethane or chloroform solution increases the yield of 8a, thus revealing that both the rates of hydroboration and deboronation increase. The structures of two new complexes 4a and 6a have been firmly established by X-ray diffraction analysis.
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Affiliation(s)
- Chien-Chih Chen
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan
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Herndon JW. The chemistry of the carbon–transition metal double and triple bond: Annual survey covering the year 2009. Coord Chem Rev 2011. [DOI: 10.1016/j.ccr.2010.07.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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