New functionalized magnesium carbenoids bearing an ester function have been prepared via an iodine-magnesium exchange reaction. These new carbenoids react with various electrophiles (60-88% yield). A substituted magnesium carbenoid has been prepared by sulfoxide-magnesium exchange.
iodine-magnesium exchange. In many cases, the exchange can be extended to heteroaryl bromides, and a case of a chlorine-magnesium exchange is described with tetrachlorothiophene. This new preparation of functionalized heteroarylmagnesium compounds provides after reaction with various electrophiles a new entry to a broad range of polyfunctional pyridines, imidazoles, furanes, thiophenes, pyrroles, antipyrines
Preparation and Reactions of Magnesiated Uracil Derivatives
作者:Mohamed Abarbri、Paul Knochel
DOI:10.1055/s-1999-2891
日期:——
The I/Mg-exchange of 5-iodouracil derivatives affords the corresponding polyfunctional Grignard reagents which were found to react with various electrophiles in good yields.
Preparation of Tertiary Amines by the Reaction of Iminium Ions Derived from Unsymmetrical Aminals with Zinc and Magnesium Organometallics
作者:Veronika Werner、Mario Ellwart、Andreas J. Wagner、Paul Knochel
DOI:10.1021/acs.orglett.5b00801
日期:2015.4.17
We report a convenient one-pot preparation of polyfunctional tertiary amines, including various biorelevant phenethylamines or ephedrine derivatives, via the reaction of new functionalized iminium ions with a variety of zinc and magnesium organometallic reagents. These iminium ions were generated from unsymmetrical aminals, obtained by the in situ addition of various amides to Tietze’s iminium salt
(Z)-Ethyl-3-perfluoroalkyl-3-magnesiated crotonates were prepared from (Z)-ethyl-3-perfluoroalkyl-3-iodo enoates by iodine-magnesium exchange reaction with isopropylmagnesium bromide in THF at -78 degreesC. These new reagents reacted with a range of electrophiles, leading to polyfunctional products bearing a perfluoroalkyl group.