A copper-catalyzed ring-opening hydroamination of methylenecyclopropanes with polymethylhydrosiloxane and O-benzoylhydroxylamines has been developed. The cyclopropane C–C bond cleavage occurs selectively at the more congested proximal position, and the corresponding homoallylamines are obtained in good to excellent yields. The umpolung electrophilic amination strategy with the hydroxylamine derivatives
Zinc-Mediated Allylation and Alkylation of Aminals in the Presence of TMSCl and Diisopropylamine
作者:Bunpei Hatano、Keita Nagahashi、Tatsuro Kijima
DOI:10.1021/jo8019797
日期:2008.11.21
An alkylation of aminals with organozinc reagents derived from allyl bromide, benzyl bromide, alpha-bromoacetate, and alpha-bromonitrile proceeded efficiently in the presence of TMSCl and diisopropylamine. This reaction system was applied to the synthesis of an antispasmodic: butaverine.
Allylation of N,N-Acetal Derivatives Using Allyl Tin Regent in the Presence of Aluminum Chloride
Allylation of N,N-acetal derivatives proceeded efficiently using allyl tin regent in the presence of aluminum chloride, giving homoallylamines in good yields. This allylation was applied for N,S-acetals to give the corresponding homoallylamines.