Highly Functional Group Compatible Rh-Catalyzed Addition of Arylboroxines to Activated <i>N</i>-<i>tert</i>-Butanesulfinyl Ketimines
作者:Hyung Hoon Jung、Andrew W. Buesking、Jonathan A. Ellman
DOI:10.1021/ol201438k
日期:2011.8.5
The rhodium-catalyzed addition of readily accessible arylboroxines to N-tert-butanesulfinyl ketimines derived from oxetan-3-one, N-Boc-azetidin-3-one, and isatins proceeds In high yields with excellent functional group compatibility. Moreover, high diastereoselectivities are observed for the additions to the N-sulfinyl ketimines derived from isatins.
Rh-Catalyzed Addition of Arylboroxines to Cyclic <i>N</i>-(Isopropanesulfinyl)ketimines
作者:Hyung Hoon Jung、Andrew W. Buesking、Jonathan A. Ellman
DOI:10.1021/jo301634y
日期:2012.11.2
Arylboroxines, which are easily accessed by drying commercially available arylboronic acids, are added to N-(isopropanesulfinyl)ketimines derived from cyclohexanone, N-Boc-piperidin-4-one, and tetrahydropyran-4-one in high yields and with excellent functional group compatibility via rhodium catalysis. These results contrast with additions to the corresponding ketimines incorporating the larger N-tert-butanesulfinyl group, which give considerably lower yields. Efficient two-step preparation of racemic isopropanesulfinamide from inexpensive isopropyl disulfide and recycling of the isopropanesulfinyl group from the addition products are also described.