2011
DOI: 10.1007/s11426-010-4139-0
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Free radical fluoroalkylation of terminal alkenes and alkynes with iododifluoromethanesulfonamides

Abstract: Free radical fluoroalkylation of terminal alkenes and alkynes with iododifluoromethanesulfonamides has been successfully achieved. It was found that both the catalytic amount of sodium dithionite (Na 2 S 2 O 4 ) and the stoichiometric amount of triethylborane (Et 3 B)/air can efficiently initiate the current free-radical atom transfer reaction.

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Cited by 9 publications
(6 citation statements)
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“…The radical α‐difluoromethylation of enamines and ynamines205 can be performed with difluorodihalomethane reagents under UV irradiation. Additionally, alkenes can be difluoromethylated with halodifluorosulfides,206 halodifluorosulfonyl reagents,207 halodifluorosulfonamide reagents,208 halodifluorosulfanyl reagents,209 and halodifluoromethane203, 210 in the presence of appropriate radical initiators. The α‐difluoromethylation of enolates with iododifluoroacetate can be mediated by the radical initiator triethylborane (Scheme ) 211.…”
Section: Difluoromethylationmentioning
confidence: 99%
“…The radical α‐difluoromethylation of enamines and ynamines205 can be performed with difluorodihalomethane reagents under UV irradiation. Additionally, alkenes can be difluoromethylated with halodifluorosulfides,206 halodifluorosulfonyl reagents,207 halodifluorosulfonamide reagents,208 halodifluorosulfanyl reagents,209 and halodifluoromethane203, 210 in the presence of appropriate radical initiators. The α‐difluoromethylation of enolates with iododifluoroacetate can be mediated by the radical initiator triethylborane (Scheme ) 211.…”
Section: Difluoromethylationmentioning
confidence: 99%
“…Sulfonyl fluorides with (protected) COOH group, especially at the α position, are prone to decarboxylation via Krapcho-type (thio)ester decomposition, [61] ketone cleavage of acetoacetic ester, [64] or thermal decomposition of free carboxylic acid (Scheme 24). [186][187][188][189] Several amino sulfonyl fluorides or the corresponding isocyanates were synthesized by the modified Curtius rearrangement reaction of SO 2 F-substituted carboxylic acids with diphenyl phosphoroyl azide (DPPA) (Scheme 25). [57,190] Also, the SO 2 F group was compatible with Boc or Cbz deprotection conditions; the corresponding amino sulfonyl fluorides could be obtained as salts (Scheme 26).…”
Section: Methodsmentioning
confidence: 99%
“…Diese ist wahrscheinlich eine Folge der Stabilität, die radikalische Zwischenstufen durch eine mehrfache Fluorsubstitution erhalten, womit auch erklärt ist, dass radikalisch ablaufende elektrophile Mono- [203] Auf ähnliche Weise wurden Alkene mit Difluordibrommethan oder Difluorbromchlormethan und dem Radikalstarter CuCl difluormethyliert. Außerdem kçnnen Alkene mit Halogendifluorsulfiden, [206] Halogendifluorsulfonyl-, [207] Halogendifluorsulfonamid- [208] und Halogendifluorsulfanylreagentien [209] sowie mit Halogendifluormethan [203,210] in Gegenwart geeigneter Radikalstarter difluormethyliert werden. Außerdem kçnnen Alkene mit Halogendifluorsulfiden, [206] Halogendifluorsulfonyl-, [207] Halogendifluorsulfonamid- [208] und Halogendifluorsulfanylreagentien [209] sowie mit Halogendifluormethan [203,210] in Gegenwart geeigneter Radikalstarter difluormethyliert werden.…”
Section: Difluormethylierungunclassified
“…[204] Die radikalische a-Difluormethylierung von Enaminen und Inaminen [205] lässt sich mit Difluordihalogenmethanreagentien unter UV-Bestrahlung durchführen. Außerdem kçnnen Alkene mit Halogendifluorsulfiden, [206] Halogendifluorsulfonyl-, [207] Halogendifluorsulfonamid- [208] und Halogendifluorsulfanylreagentien [209] sowie mit Halogendifluormethan [203,210] in Gegenwart geeigneter Radikalstarter difluormethyliert werden. Für die a-Difluormethylierung von Enolaten mit Ioddifluoracetat wurde der Radikalstarter Triethylboran eingesetzt (Schema 46).…”
Section: Difluormethylierungunclassified