Journal
ORGANIC LETTERS
Volume 7, Issue 13, Pages 2547-2550Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol047311p
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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.
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