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Baskir EG, Gvozdev VD, Shavrin KN, Egorov MP, Nefedov OM. Infrared-Spectroscopic Study of (4-Methylpent-3-en-1-ynyl)methylthiocarbene, Its Photochemical Transformations, and Reactions in an Argon Matrix. J Phys Chem A 2019; 123:9175-9184. [PMID: 31613622 DOI: 10.1021/acs.jpca.9b06798] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The first representative of singlet carbenes bearing both ethynyl and methylthio groups at the carbene center, (4-methylpent-3-en-1-ynyl)methylthiocarbene, has been generated in a low-temperature Ar matrix upon UV photolysis of 3,3-dimethyl-5-methylthioethynyl-3H-pyrazole and detected by FTIR spectroscopy. The generation of the carbene proceeds via intermediate (3-diazo-5-methylhex-4-en-1-ynyl)methylsulfane. The comparison of FTIR spectroscopy data with the results of quantum chemical calculations (B3LYP/aug-cc-pVTZ) and NRT analysis shows that (4-methylpent-3-en-1-ynyl)methylthiocarbene has a singlet ground state with the localization of the unpaired spins on the carbon atom in the α-position to methylthio moiety. Two major pathways of further phototransformation of the studied carbene have been found. One of them produces photochemically stable thioketone (S═CMe-C≡C-CH═CMe2) as a result of methyl group migration from sulfur to the neighboring carbon atom, and the other one leads to the formation of labile thioketene (S═C═C(Me)-CH═CH-CMe═CH2). Ability of (4-methylpent-3-en-1-ynyl)methylthiocarbene to insert into the H-Cl bond was established, which additionally confirms the singlet nature of this intermediate.
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Affiliation(s)
- Esfir G Baskir
- N. D. Zelinsky Institute of Organic Chemistry , Russian Academy of Sciences , Leninsky Prospekt 47 , Moscow 119991 , Russian Federation
| | - Valentin D Gvozdev
- N. D. Zelinsky Institute of Organic Chemistry , Russian Academy of Sciences , Leninsky Prospekt 47 , Moscow 119991 , Russian Federation
| | - Konstantin N Shavrin
- N. D. Zelinsky Institute of Organic Chemistry , Russian Academy of Sciences , Leninsky Prospekt 47 , Moscow 119991 , Russian Federation
| | - Mikhail P Egorov
- N. D. Zelinsky Institute of Organic Chemistry , Russian Academy of Sciences , Leninsky Prospekt 47 , Moscow 119991 , Russian Federation
| | - Oleg M Nefedov
- N. D. Zelinsky Institute of Organic Chemistry , Russian Academy of Sciences , Leninsky Prospekt 47 , Moscow 119991 , Russian Federation
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Disease-Causing Mutations in the G Protein Gαs Subvert the Roles of GDP and GTP. Cell 2018; 173:1254-1264.e11. [PMID: 29628140 DOI: 10.1016/j.cell.2018.03.018] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Revised: 01/23/2018] [Accepted: 03/07/2018] [Indexed: 12/17/2022]
Abstract
The single most frequent cancer-causing mutation across all heterotrimeric G proteins is R201C in Gαs. The current model explaining the gain-of-function activity of the R201 mutations is through the loss of GTPase activity and resulting inability to switch off to the GDP state. Here, we find that the R201C mutation can bypass the need for GTP binding by directly activating GDP-bound Gαs through stabilization of an intramolecular hydrogen bond network. Having found that a gain-of-function mutation can convert GDP into an activator, we postulated that a reciprocal mutation might disrupt the normal role of GTP. Indeed, we found R228C, a loss-of-function mutation in Gαs that causes pseudohypoparathyroidism type 1a (PHP-Ia), compromised the adenylyl cyclase-activating activity of Gαs bound to a non-hydrolyzable GTP analog. These findings show that disease-causing mutations in Gαs can subvert the canonical roles of GDP and GTP, providing new insights into the regulation mechanism of G proteins.
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Ravasco JMJM, Monteiro CM, Trindade AF. Cyclopropenes: a new tool for the study of biological systems. Org Chem Front 2017. [DOI: 10.1039/c7qo00054e] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Cyclopropenes have become an important mini-tag tool in chemical biology, participating in fast inverse electron demand Diels–Alder and photoclick reactions in biological settings.
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Affiliation(s)
- João M. J. M. Ravasco
- Instituto de Investigação do Medicamento (iMed.ULisboa)
- Faculdade de Farmácia
- Universidade de Lisboa
- 1649-003 Lisboa
- Portugal
| | - Carlos M. Monteiro
- Instituto de Investigação do Medicamento (iMed.ULisboa)
- Faculdade de Farmácia
- Universidade de Lisboa
- 1649-003 Lisboa
- Portugal
| | - Alexandre F. Trindade
- Instituto de Investigação do Medicamento (iMed.ULisboa)
- Faculdade de Farmácia
- Universidade de Lisboa
- 1649-003 Lisboa
- Portugal
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Broderick BM, McCaslin L, Moradi CP, Stanton JF, Douberly GE. Reactive intermediates in 4He nanodroplets: Infrared laser Stark spectroscopy of dihydroxycarbene. J Chem Phys 2015; 142:144309. [DOI: 10.1063/1.4917421] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Affiliation(s)
| | - Laura McCaslin
- Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, USA
| | | | - John F. Stanton
- Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, USA
| | - Gary E. Douberly
- Department of Chemistry, University of Georgia, Athens, Georgia 30602-2556, USA
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Lee GA, Chan LE, Tsai RT, Chen KC. Generation and Chemistry of Tricyclo[3.2.1.02,4]oct-2(3)-ene. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200048] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Song MG, Sheridan RS. Regiochemical Substituent Switching of Spin States in Aryl(trifluoromethyl)carbenes. J Am Chem Soc 2011; 133:19688-90. [DOI: 10.1021/ja209613u] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Myoung-Geun Song
- Department of Chemistry, University of Nevada, Reno, Nevada 89557, United States
| | - Robert S. Sheridan
- Department of Chemistry, University of Nevada, Reno, Nevada 89557, United States
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7
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Sheridan RS. Exploring matrix isolated carbenes and bis-carbenes with electronic spectroscopy as a guide. J PHYS ORG CHEM 2010. [DOI: 10.1002/poc.1649] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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8
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Katiyar V, Nanavati H. Ring-opening polymerization of L-lactide using N-heterocyclic molecules: mechanistic, kinetics and DFT studies. Polym Chem 2010. [DOI: 10.1039/c0py00125b] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Boganov SE, Faustov VI, Shavrin KN, Gvozdev VD, Promyslov VM, Egorov MP, Nefedov OM. A Highly Delocalized Triplet Carbene, 5-Methylhexa-1,2,4-triene-1,3-diyl: Matrix IR Identification, Structure, and Reactions. J Am Chem Soc 2009; 131:14688-98. [DOI: 10.1021/ja901508c] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Sergey E. Boganov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospekt 47, Moscow, Russian Federation 119991
| | - Valery I. Faustov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospekt 47, Moscow, Russian Federation 119991
| | - Konstantin N. Shavrin
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospekt 47, Moscow, Russian Federation 119991
| | - Valentin D. Gvozdev
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospekt 47, Moscow, Russian Federation 119991
| | - Vladimir M. Promyslov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospekt 47, Moscow, Russian Federation 119991
| | - Mikhail P. Egorov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospekt 47, Moscow, Russian Federation 119991
| | - Oleg M. Nefedov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospekt 47, Moscow, Russian Federation 119991
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Zhang Y, Kubicki J, Platz MS. Ultrafast UV−Visible and Infrared Spectroscopic Observation of a Singlet Vinylcarbene and the Intramolecular Cyclopropenation Reaction. J Am Chem Soc 2009; 131:13602-3. [DOI: 10.1021/ja905992p] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Yunlong Zhang
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio, 43210, and Quantum Electronics Laboratory, Faculty of Physics, Adam Mickiewicz University, 85 Umultowska, Poznan 61-614, Poland
| | - Jacek Kubicki
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio, 43210, and Quantum Electronics Laboratory, Faculty of Physics, Adam Mickiewicz University, 85 Umultowska, Poznan 61-614, Poland
| | - Matthew S. Platz
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio, 43210, and Quantum Electronics Laboratory, Faculty of Physics, Adam Mickiewicz University, 85 Umultowska, Poznan 61-614, Poland
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Wang J, Sheridan RS. A Singlet Aryl-CF3 Carbene: 2-Benzothienyl(trifluoromethyl)carbene and Interconversion with a Strained Cyclic Allene. Org Lett 2007; 9:3177-80. [PMID: 17630757 DOI: 10.1021/ol071290s] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Matrix-isolated 2-benzothienyl(trifluoromethyl)carbene was generated by irradiation of the corresponding diazirine, and characterized by IR and UV/vis spectroscopy, in situ trapping, and DFT modeling. Experiments and calculations indicate that the carbene is a ground-state singlet, in contrast to previously characterized aryl(trifluoromethyl)carbenes. The carbene could be interconverted photochemically with a ring-opened thioquinomethide and a highly strained cyclic allene.
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Affiliation(s)
- Jian Wang
- Department of Chemistry, Mail Stop 216, University of Nevada, Reno, Nevada 89557, USA
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12
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Nakane N, Nicolaides A, Tomioka H, Asato AE, Liu RSH. Hula-twist photoisomerization of a styrene derivative examined by argon-matrix-infrared-spectroscopic method. Mol Phys 2007. [DOI: 10.1080/00268970500417747] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Norio Nakane
- a Faculty of Engineering, Chemistry Department for Materials , Mie University , Tsu, Mie, 514-8507, Japan
| | | | - Hideo Tomioka
- a Faculty of Engineering, Chemistry Department for Materials , Mie University , Tsu, Mie, 514-8507, Japan
| | - Alfred E. Asato
- c Department of Chemistry , University of Hawaii , 2545 The Mall, Honolulu, HI 96822, USA
| | - Robert S. H. Liu
- c Department of Chemistry , University of Hawaii , 2545 The Mall, Honolulu, HI 96822, USA
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Zuev PS, Sheridan RS, Sauers RR, Moss RA, Chu G. Conformational Product Control in the Low-Temperature Photochemistry of Cyclopropylcarbenes. Org Lett 2006; 8:4963-6. [PMID: 17020347 DOI: 10.1021/ol0620601] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] Different conformers of two fused-ring cyclopropylchlorocarbenes are shown to undergo distinct, wavelength-selectable, photochemistry in low-temperature matrixes. Conformers with H and Cl syn give ring expansion predominantly, whereas those with H and Cl anti mainly fragment.
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Affiliation(s)
- Peter S Zuev
- Department of Chemistry, University of Nevada, Reno, Nevada 89557, USA
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Nikitina AF, Sheridan RS. Geometry and aromaticity in highly strained heterocyclic allenes: characterization of a 2,3-didehydro-2H-thiopyran. Org Lett 2006; 7:4467-70. [PMID: 16178560 DOI: 10.1021/ol051733x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] The highly strained cyclic allene 2,3-didehydro-2H-thiopyran was generated by irradiation of matrix-isolated 2-benzothienylchlorocarbene and characterized by IR and UV/vis spectroscopy, in situ trapping, and DFT modeling. Calculations indicate that the allenic moiety in this system, although less aromatic in character, is relatively more stable than in the corresponding oxa system. It is suggested that the thio ring system can more readily accommodate the allenic geometry.
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Affiliation(s)
- Asya F Nikitina
- Department of Chemistry, Mail Stop 216, University of Nevada, Reno, Nevada 89557, USA
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Moss RA, Tian J, Sauers RR, Sheridan RS, Bhakta A, Zuev PS. Kinetic Studies of the Cyclization of Singlet Vinylchlorocarbenes. Org Lett 2005; 7:4645-8. [PMID: 16209500 DOI: 10.1021/ol051743y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] Vinylchlorocarbenes (R = Me or Cl) cyclize to cyclopropenes with k = (2.4-5.1) x 10(7) s(-1) or (3.1-4.5) x 10(6) s(-1), respectively, in solution at room temperature. The corresponding E(a) values are 6.6 and 5.7 kcal/mol. Excited diazirines are also likely precursors of the cyclopropenes.
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Affiliation(s)
- Robert A Moss
- Department of Chemistry and Chemical Biology, Rutgers, State University of New Jersey, New Brunswick, New Jersey 08903, USA.
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