2017
DOI: 10.1039/c7sc02768k
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Remote C–H insertion of vinyl cations leading to cyclopentenones

Abstract: Vinyl cations, generated by reacting β-hydroxy-α-diazo ketones with Lewis acids, undergo a 1,2-shift and C–H insertion to give cyclopentenone products.

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Cited by 42 publications
(37 citation statements)
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“…[11] In the presence of Lewis acids,d ehydroxylation of b-hydroxy-a-diazo ketones 11 was followed by the release of N 2 to give 13.A1,2-C shift across the alkene affords the ring-expanded vinyl cation, which inserts into the tethered CÀHbond. [11] In the presence of Lewis acids,d ehydroxylation of b-hydroxy-a-diazo ketones 11 was followed by the release of N 2 to give 13.A1,2-C shift across the alkene affords the ring-expanded vinyl cation, which inserts into the tethered CÀHbond.…”
Section: Methodsmentioning
confidence: 99%
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“…[11] In the presence of Lewis acids,d ehydroxylation of b-hydroxy-a-diazo ketones 11 was followed by the release of N 2 to give 13.A1,2-C shift across the alkene affords the ring-expanded vinyl cation, which inserts into the tethered CÀHbond. [11] In the presence of Lewis acids,d ehydroxylation of b-hydroxy-a-diazo ketones 11 was followed by the release of N 2 to give 13.A1,2-C shift across the alkene affords the ring-expanded vinyl cation, which inserts into the tethered CÀHbond.…”
Section: Methodsmentioning
confidence: 99%
“…[12] The weakly coordinating anion [HCB 11 Cl 11 ] À (WCA) is crucial for both the enhanced Lewis acidity of the cationic [Et 3 Si] + , which enables ionization of the cyclic vinyl triflate 16,and the stabilization of the thus generated vinyl cation A.T he insertion of A was found to proceed via as ingle early ambimodal transition state TS,i nw hich the geminal cyclohexane C À Hb onds interact with the vacant p-orbital of the vinyl cation. [12] The weakly coordinating anion [HCB 11 Cl 11 ] À (WCA) is crucial for both the enhanced Lewis acidity of the cationic [Et 3 Si] + , which enables ionization of the cyclic vinyl triflate 16,and the stabilization of the thus generated vinyl cation A.T he insertion of A was found to proceed via as ingle early ambimodal transition state TS,i nw hich the geminal cyclohexane C À Hb onds interact with the vacant p-orbital of the vinyl cation.…”
Section: Methodsmentioning
confidence: 99%
“…[11] In Gegenwart von Lewis-Säuren folgt der Dehydroxylierung von b-Hydroxy-a-diazoketonen 11 eine N 2-Abspaltung zu 13.E ine 1,2-C-Verschiebung über das Alken liefert das ringerweiterte Vinylkation, das in die angehängte C-H-Bindung insertiert. [11] In Gegenwart von Lewis-Säuren folgt der Dehydroxylierung von b-Hydroxy-a-diazoketonen 11 eine N 2-Abspaltung zu 13.E ine 1,2-C-Verschiebung über das Alken liefert das ringerweiterte Vinylkation, das in die angehängte C-H-Bindung insertiert.…”
Section: Methodsunclassified
“…[12] Das schwach koordinierende Anion [HCB 11 Cl 11 ] À (WCA) ist entscheidend sowohl fürd ie hçhere Lewis-Aciditätd es kationischen [Et 3 Si] + ,d as die Ionisierung des cyclischen Vinyltriflats 16 ermçglicht, als auch fürd ie Stabilisierung des so gebildeten Vinylkations A.W ie sich herausstellte,verläuft die Insertion von A über nur einen frühen ambimodalen Übergangszustand TS,i nd em die geminalen Cyclohexan-C-H-Bindungen mit dem unbesetzten p-Orbital des Vinylkations wechselwirken. In Zusammenarbeit mit Houk et al wurde der Mechanismus eingehend untersucht (Schema 4).…”
Section: Beschrieben Nelson Et Al Die Erste Intermolekulareunclassified
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