Enantioposition-Selective Copper-Catalyzed Azide–Alkyne Cycloaddition for Construction of Chiral Biaryl Derivatives
摘要:
A highly enantioposition-selective copper-catalyzed azidealkyne cycloaddition (CuAAC) of dialkynes bearing prochiral biaryls has been developed for the construction of 1,2,3-triazoles bearing axially chiral biaryl groups in up to 76% yield and up to 99% ee.
Asymmetric Sonogashira Coupling with a Chiral Palladium Imidazoindole Phosphine Complex
作者:Yasuhiro Uozumi、Haifeng Zhou
DOI:10.1055/s-0033-1339873
日期:——
The asymmetric Sonogashira coupling of 1-(2,6-dibromophenyl)naphthalene or 4,16-dibromo[2,2]paracyclophane with various terminal alkynes was carried out with a palladiumcomplex of a homochiral imidazoindole phosphine, a derivative of a (3R,9aS)-2-aryl-[3-(2-dialkylphosphanyl)phenyl]tetrahydro-1H-imidazo[1,5a]indol-1-one, to give the corresponding axially chiral monoalkynylated biaryl products with
A straightforward “bottom-up” approach has been used to synthesize azulene-embedded pristine [n]helicenes (n=5, 6 and 7) that show low-lying first electric states, small optical energy gaps, and anti-Kasha emissions. These azulene-embedded [n]helicenes contribute to the non-benzenoid helicene library and allow structure–property relationships to be better understood.
一种直接的“自下而上”方法已被用于合成嵌嵌薁的原始 [ n ] 螺旋烯(n = 5、6 和 7),其显示出低位的第一电态、小的光学能隙和反Kasha 发射。这些azulene嵌入的 [ n ] 螺旋烯有助于非苯型螺旋烯库,并允许更好地理解结构-性质关系。