A Mild and Convenient Barbier-Type Allylation of Aldehydes to Homoallylic Alcohols via Iodide Ion Promoted Stannylation of Allylic Bromides and Chlorides with Tin(II) Chloride
作者:Toshiro Imai、Shinya Nishida
DOI:10.1055/s-1993-25871
日期:——
Barbier-type allylation of aldehydes with allylic bromides and tin(II) chloride dihydrate is largely accelerated by adding stoichiometric or substoichiometric amounts of sodium iodide. This method has some merits such as lower temperature, shorter reaction time and/or more choices of solvents for the reaction. Moreover, the activation by the iodide ion enables the use of relatively unreactive allylic chlorides of various structural types (e.g., 3-chloro-2-chloromethylpropene as an isobutene dianion equivalent) and, thus, expands synthetic applicability of this reaction. The major role of the iodide salt is attributed to the in situ generation of the corresponding allylic iodide.
An efficient synthesis of 3-chlorohomoallyl alcohols. Zinc-promoted 2-chloroallylation of carbonyl compounds with 2,3-dichloropropene in an aqueous solvent system
作者:Yoshiaki Oda、Sanshiro Matsuo、Kenji Saito
DOI:10.1016/s0040-4039(00)77683-0
日期:1992.1
In the presence of metallic zinc, 2,3-dichloropropene has been found to react smoothly with a variety of carbonyl compounds in an aqueous solvent system to give the corresponding 3-chlorohomoallyl alcohols in excellent yields.
Synthesis of homoallylic (but-3-enylic) alcohols from aldehydes with allylic chlorides, tin(II) chloride and potassium iodide in water
Homoallylic (but-3-enylic) alcohols have been prepared in good yields
by reductive allylation of aldehydes in water with various allylic
chlorides in the presence of tin(II) chloride and potassium
iodide. The Barbier type reaction with prop-2-ynyl chloride is also
achieved under the same conditions.