Asymmetric Synthesis of [7]Helicene-Like Molecules
摘要:
A new approach to nonracemic [7]helicene-like molecules has been developed. Stereoselective Col-mediated [2 + 2 + 2] cycloisomerization of aromatic triynes containing an asymmetric carbon atom produces [7]helicene-like scaffolds in diastereomeric ratios up to 100:0. This central-to-helical chirality transfer can be controlled by the absolute configuration at the asymmetric center and by the presence of carbon substituents.
Asymmetric Synthesis of [7]Helicene-Like Molecules
摘要:
A new approach to nonracemic [7]helicene-like molecules has been developed. Stereoselective Col-mediated [2 + 2 + 2] cycloisomerization of aromatic triynes containing an asymmetric carbon atom produces [7]helicene-like scaffolds in diastereomeric ratios up to 100:0. This central-to-helical chirality transfer can be controlled by the absolute configuration at the asymmetric center and by the presence of carbon substituents.
Asymmetric Synthesis of [7]Helicene-Like Molecules
作者:Irena G. Stará、Zuzana Alexandrová、Filip Teplý、Petr Sehnal、Ivo Starý、David Šaman、Miloš Buděšínský、Josef Cvačka
DOI:10.1021/ol047311p
日期:2005.6.1
A new approach to nonracemic [7]helicene-like molecules has been developed. Stereoselective Col-mediated [2 + 2 + 2] cycloisomerization of aromatic triynes containing an asymmetric carbon atom produces [7]helicene-like scaffolds in diastereomeric ratios up to 100:0. This central-to-helical chirality transfer can be controlled by the absolute configuration at the asymmetric center and by the presence of carbon substituents.