Journal
ORGANIC LETTERS
Volume 16, Issue 11, Pages 2996-2999Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol501125r
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- UoH
- CSIR, India
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A base promoted reaction between N-protected propargyl amines and 3-bromopropiolate readily provides an array of novel stable alkyne-tethered ketene N,N-acetals in good yields. A wide range of structurally complex cyclobutene-fused azepine heterocycles are synthesized through the goldcatalyzed intramolecular cycloisomerization of ketene N,N-acetals for the first time. A plausible reaction pathway is deduced on the basis of the H-1 NMR studies.
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