Synthesis of Substituted Isoquinolines via Nickel-Catalyzed [2+2+2] Cycloaddition of Alkynes and 3,4-Pyridynes
作者:Yoshihiro Sato、Toshihiko Iwayama
DOI:10.3987/com-09-s(s)126
日期:——
A novel methodology for the synthesis of substituted isoquinolines via a nickel(0)-catalyzed [2+2+2] cycloaddition of 3,4-pyridynes with two molecules of alkyne has been established. In this reaction, it was found that 2-butyn-1,4-diol derivatives and 1,3-diynes are suitable as substrates and that a propargylic oxygen functionality in alkynes is essential for the reactivity and the selectivity of the
Hydroboration of Arynes with N-Heterocyclic Carbene Boranes
作者:Tsuyoshi Taniguchi、Dennis P. Curran
DOI:10.1002/anie.201408345
日期:2014.11.24
Arynes were generated in situ from ortho‐silyl aryl triflates and fluoride ions in the presence of stable N‐heterocyclic carbeneboranes (NHCBH3). Spontaneous hydroboration ensued to provide stable B‐aryl‐substituted NHC‐boranes (NHCBH2Ar). The reaction shows good scope in terms of both the NHC‐borane and aryne components and provides direct access to mono‐ and disubstituted NHC‐boranes. The formation
Nickel(0)-catalyzed [2 + 2 + 2] cycloaddition of diynes and 3,4-pyridynes: novel synthesis of isoquinoline derivatives
作者:Toshihiko Iwayama、Yoshihiro Sato
DOI:10.1039/b912022j
日期:——
A transition metal-catalyzed [2 + 2 + 2] cycloaddition between alpha,omega-diynes and 3,4-pyridynes has been realized for the first time, producing isoquinolines in good yields by using a nickel(0) catalyst.
Addition of Cyclic Ureas and 1-Methyl-2-oxazolidone to Pyridynes: A New Approach to Pyridodiazepines, Pyridodiazocines, and Pyridooxazepines
作者:Nozomi Saito、Ken-ichi Nakamura、Sayako Shibano、Soichiro Ide、Masabumi Minami、Yoshihiro Sato
DOI:10.1021/ol303352q
日期:2013.1.18
Reactions of pyridynes with cyclic urea and 1-methyl-2-oxazolidone were demonstrated. 3,4-Pyridyne and 2,3-pyridyne were reacted with N,N-dimethylimidazolidone, N,N-dimethylpropylene urea, and 1-methyl-2-oxazolidone to give the corresponding pyridodiazepines, pyridodiazocines, and pyridooxazepines, respectively.