Direct synthesis of hetero-biaryl compounds containing an unprotected NH2 group via Suzuki–Miyaura reaction
作者:Takahiro Itoh、Toshiaki Mase
DOI:10.1016/j.tetlet.2005.03.053
日期:2005.5
Hetero-biaryl compounds were prepared via the Suzuki-Miyaura coupling reaction of hetero-aryl moieties containing an unprotected NH2 group and arylboronic acids. D-t-BPF was found to be an efficient ligand for the cross-coupling of NH2-unprotected hetero-aryl chlorides with phenylboronic acid. (c) 2005 Elsevier Ltd. All rights reserved.
Synthesis of 4-amino-5-fluoropyrimidines and 5-amino-4-fluoropyrazoles from a β-fluoroenolate salt
作者:Tobias Lucas、Jule-Philipp Dietz、Till Opatz
DOI:10.3762/bjoc.16.41
日期:——
A synthesis of fluorinated pyrimidines under mild conditions from amidine hydrochlorides and the recently described potassium 2-cyano-2-fluoroethenolate was developed. A broad substrate scope was tested and mostly excellent yields were obtained. The synthesis of fluorinated aminopyrazoles from the same fluorinated precursor could be demonstrated but proceeded with lower efficiency.