Deprotection of Homoallyl (hAllyl) Derivatives of Phenols, Alcohols, Acids, and Amines
摘要:
The homoallyl moiety, (h)Allyl, is presented as a general protecting group for several functionalities. It can be chemoselectively removed via a sequential, one-pot cross-metathesis/elimination sequence.
A synthetic route to α-aminoketone derivatives via a heteroDiels–Alderreaction is described. Diacylhydrazine was oxidized by tert-butyl hypochlorite in the presence of pyridine. After evaporation, the heteroDiels–Alderreaction with diene was carried out without isolation of the azodicarbonyl compound. Quantitative heteroDiels–Alderreaction was possible with 1 equivalent of diene when Hf(OTf)4