Abstract:A wide variety of bench-stable potassium heteroaryltrifluoroborates were prepared and general reaction conditions were developed for their cross-coupling to aryl and heteroaryl halides. The crosscoupled products were obtained in good to excellent yields. This method represents an efficient and facile installation of heterocyclic building blocks onto preexisting organic substructures.
“…which are unstable in many reactions (42)(43)(44)(45), also underwent this process to form the corresponding product from trans-hydroheteroarylation of diphenylacetylene. Reaction of a heteroaryl boronic acid with an internal alkyne possessing alkyl substituents also formed the product of hydroheteroarylation.…”
“…which are unstable in many reactions (42)(43)(44)(45), also underwent this process to form the corresponding product from trans-hydroheteroarylation of diphenylacetylene. Reaction of a heteroaryl boronic acid with an internal alkyne possessing alkyl substituents also formed the product of hydroheteroarylation.…”
The rhodium-catalysed carbonylative addition of arylboronic acids to propargylic alcohols yields gamma-hydroxy enones that are readily cyclised through a dehydration step to the corresponding furan analogues. The transformation was improved thanks to the screening of the reaction conditions and consequent improvements were obtained from the use of dicarbonylrhodium iodide [Rh(CO) 2 I] 2 as catalyst precursor. The generalisation of the reaction was then further investigated by employing variously substituted arylboronic acids and propargylic alcohols.
“…(27) und (28) [60] Die umfangreichste Studie zu diesem Thema überzeugte dann aber, dass die Kombination aus Kaliumheteroaryltrifluorboraten und einfach koordinierten Palladiumkomplexen ideal für derartige Kreuzkupplungen ist (Schema 14). [69] In dieser Studie wurde Furan-2-yltrifluorborat als Bezugssubstrat gewählt, weil die entsprechende Boronsäure mit einem für andere Heteroarylboronsäuren optimierten System keinerlei Kupplungsprodukt ergeben hatte. [70] [71] bis der erste Bericht über eine Reaktion dieser Elektrophile mit Alkyltrifluorboraten erschien.…”
Einfach koordinierte katalytische Palladiumkomplexe mit sperrigen, elektronenreichen Phosphan‐ oder N‐heterocyclischen Carbenliganden haben die Suzuki‐Miyaura‐Kupplung revolutioniert. Weitere interessante Perspektiven für diese Reaktionen ergaben sich durch die Einführung von Organotrifluorboraten als Organoborkomponenten. Die Kombination dieser beiden Neuerungen führte zu einem außerordentlich leistungsfähigen Kreuzkupplungsverfahren.
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