The rhodium(II)‐catalyzed denitrogenative coupling of N‐alkylsulfonyl 1,2,3‐triazoles with 1,3,5‐trioxane led to nine‐membered‐ringed trioxazonines in moderate‐to‐good yields. 1,3,5‐Trioxane, acting as an oxygen nucleophile, reacted with the α‐aza‐vinylcarbene intermediate, giving rise to ylide formation, which was probably the key step in the reaction. Triazoles that contained aryl substituents with
A sequential procedure for the synthesis of 2,5-disubstituted thiazoles from terminal alkynes, sulfonyl azides, and thionoesters is reported. A copper(I)-catalyzed 1,3-dipolar cycloaddition of terminal alkynes with sulfonyl azides affords 1-sulfonyl-1,2,3-triazoles, which then react with thionoesters in the presence of a rhodium(II) catalyst. The resulting 3-sulfonyl-4-thiazolines subsequently aromatize
<i>N</i>-Imidazolylation of Sulfoximines from<i>N</i>-Cyano Sulfoximines, 1-Alkynes, and<i>N</i>-Sulfonyl Azides
作者:Sanghyuck Kim、Ji Eun Kim、Jinsub Lee、Phil Ho Lee
DOI:10.1002/adsc.201500636
日期:2015.11.16
The rhodium-catalyzed N-imidazolylation of N-sulfonyl-1,2,3-triazoles with a variety of N-cyano sulfoximines has been developed for the synthesis of N-imidazolyl sulfoximines via elimination of molecular nitrogen. Copper-catalyzed [3+2] cycloaddition followed by rhodium-catalyzed N-imidazolylation from 1-alkynes, N-sulfonylazides, and N-cyano sulfoximines is also demonstrated for the synthesis of N-imidazolyl
Herein, the rhodium(II)-catalyzed cyclopropanation reaction of pinacol allylboronate with N-sulfonyl-1,2,3-triazoles is reported. Boryl-substituted cyclopropylmethanamines are produced in a highly diastereo- and enantioselective manner. Various cyclopropylmethanamines containing a quaternary stereocenter are derivedfrom them.