Regioselective Control in the Reactions of α-Aminoalkylcuprates with Allylic Substrates
作者:R. Dieter、Sadanandan Velu、Lois Nice
DOI:10.1055/s-1997-1544
日期:1997.9
Organocuprate reagents prepared from α-aminoalkyllithium reagents and CuCN react with allylic electrophiles to afford homoallylic amines. Allylic sulfides of benzothiazole-2-thiol give exclusively substitution products without rearrangement while cuprate reagents prepared from primary α-aminoalkyl ligands react with allylic bromides to give rearranged substitution products with modest regioselectivity. Chemical yields and regioselectivities are dependent upon solvent, substrate leaving group, added LiCl salt, and α-aminoalkyl ligand.
Preparation of Alkyl Aryl Sulfides from Alcohols and 2-Sulfanylbenzothiazole by a New Type of Oxidation–Reduction Condensation Using Aryl Diphenylphosphinite and Benzoquinone Derivatives
作者:Kiichi Kuroda、Yujiro Hayashi、Teruaki Mukaiyama
DOI:10.1246/cl.2008.592
日期:2008.6.5
A method for the preparation of alkylaryl sulfides from alcohols and 2-sulfanylbenzothiazole by a new type of oxidation–reduction condensation using phenyl diphenylphosphinite and 2,6-dimethoxy-1,...
(Chloromethylene)dimethylammonium chloride (Vilsmeier reagent), prepared easily from DMF and oxalyl chloride, works as an efficient condensation reagent for the thioetherification of alcohols in on...
Heterocyclic allyl sulphides 1–6 react with an excess of ethyl diazoacetate in the presence of copper(I)exafluorophosphate acetonitrile complex in dichloromethane under mild conditions to give, through the formation of homoallylic sulphides intermediates, conjugated dienoic esters in high yields.
Substitution of allylic sulphides of benzothiazole-2-thiol with organomagnesium compounds in the presence of copper(<scp>I</scp>) iodide. A regioselective synthesis of olefins
Primary allylicsulphides of benzothiazole-2-thiol react with butylmagnesium bromide in the presence of copper(I) iodide to yield, depending on the solvent, olefins with or without allylic rearrangement.