The Mukaiyama's esterification protocol, using 2-chloro-1-methylpyridinium iodide-triethylamine reagent, has been successfully exploited to provide rapid access to a variety of 3-substituted coumarins in satisfactory yields.
Enantioselective Synthesis of Diaryl Sulfoxides Enabled by Molecular Recognition
作者:Finn Burg、Christoph Buchelt、Nora M. Kreienborg、Christian Merten、Thorsten Bach
DOI:10.1021/acs.orglett.1c00238
日期:2021.3.5
The enantioselective sulfoxidation of diaryl-type sulfides was accomplished using a chiral manganese porphyrin complex equipped with a remote molecular recognition site. Despite the marginal size difference between the two substituents at the prostereogenic sulfur center, hydrogen bonding enabled the formation of chiral sulfoxides with exquisite enantioselectivities (16 examples, up to 99% ee). Aside