PCCP‐Catalyzed Synthesis of Tetrasubstituted Allenes Bearing Heteroaromatic Sulfenyl Group**
作者:Martin Kamlar、Ivana Císařová、Jan Veselý
DOI:10.1002/ejoc.202300400
日期:2023.8.21
Simple, one-step Brønsted acid catalyzed reaction of propargyl alcohol derivatives with heterocyclic thiols was performed with the aid of pentacarboxycyclopenatadiene (PCCP) catalyst. This reported approach provides an access to tetrasubstituted allenes substituted with heterocyclic thioethers in good to excellent yield under mild reaction conditions.
Palladium(0)-catalyzed one-atom ring-expansion of 1-hydroxy-2,2-dialkyl-1-propenoylindan derivatives has been achieved in the presence of P(o-tolyl)(3) giving 2-hydroxy-3,3-dialkyl-2-vinyl-l-tetralone derivatives in excellent yields. This ring-expansion reaction was applied to a 17-(1-oxo-2-propenyl)-beta-estradiol derivative and furnished a similar ring-expanded product in an excellent yield.