Stereoselective Nucleophilic Monofluoromethylation of N-(tert-Butanesulfinyl)imines with Fluoromethyl Phenyl Sulfone
摘要:
Highly stereoselective nucleophilic monofluoromethylation of (R)-(tert-butanesulfinyl)imines with fluoromethyl phenyl sulfone was achieved to afford alpha-monofluoromethylamines with a nonchelation-controlled stereoselectivity mode. By using the same chemistry, (R)-(tert-butanesulfinyl)imines bearing a terminal tosylate (M) group can be converted to alpha-monofluoromethylated cyclic secondary amines with high stereoselectivity.
Stille Coupling of Stereochemically Defined α-Sulfonamidoorganostannanes
作者:Kevin W. Kells、J. Michael Chong
DOI:10.1021/ja044354s
日期:2004.12.1
Addition of tributylstannylmetallics to (R)-tert-butanesulfonimine derivatives of arylaldehydes provides alpha-sulfinamidostannanes with high (>98% de) diastereoselectivities. Oxidation of these compounds with m-CPBA gives alpha-sulfonamidostannanes which undergo Pd/Cu-catalyzed Stille-type couplings with benzoyl chloride. Best yields are achieved using the electron-rich tris(2,4,6-trimethoxyphenyl)phosphine as the ligand. Inversion of configuration at the benzylic carbon is observed.