Pyrolysis of azetidinone derivatives: a versatile route towards electron-rich alkenes, C-1 allylation and/or homologation of aldehydes
作者:Nouf S. Al-Hamdan、Osama M. Habib、Yehia A. Ibrahim、Nouria A. Al-Awadi、Osman M. E. El-Dusouqui
DOI:10.1039/c4ra01024h
日期:——
β-thiolactams led essentially to stereoselective synthesis of the high energy electron-rich Z-alkenes. Extension of this methodology to the pyrolysis of 3-allyloxy derivatives gave a simple direct route to the synthetically important 4-pentenal. These pyrolytic transformations convert aldehydes to aryloxyalkenes (a protected homologation) and 4-pentenal (a C-1 allylation and homologation). The starting
A new type of allylation: synthesis of β,γ-unsaturated ketones from α-halogenated aryl ketones using an allyltributyltin(IV)–tin(II) dichloride–acetonitrile system
作者:Makoto Yasuda、Makihiro Tsuchida、Akio Baba
DOI:10.1039/a708679b
日期:——
Allylation of α-halogenated aryl ketones with an allyltributyltinâtin dichlorideâacetonitrile system gave β,γ-unsaturated ketones in high yields via selective aryl rearrangement.
Multi-Product Classes Obtained from Allylation of α-Halo Ketones with Allylzinc Bromide
作者:Min Zhang、Yuanyuan Hu、Songlin Zhang
DOI:10.1002/chem.200901487
日期:2009.10.19
An efficient, one‐pot synthesis procedure for the preparation of allylic epoxides, aldehydes and homoallylic alcohols (see scheme) has been described. The three industrial products were synthesized by the reaction of allylzinc bromide with α‐halo ketones under non‐catalytic conditions with p‐toluenesulfonic acid and ytterbium triflate as catalysts, respectively. Feasible reaction mechanisms and intermediates
Reaction of α-chloro ketones with allyltri-n-butyltin proceeds to afford 4-butenyl ketones in the presence of azobisisobutyronitrile, while in the presence of catalytic amounts of tetrakis(triphenylphosphine)palladium allyl epoxides are obtained.