Remote Stereochemical Control of Both Reacting Centers in Ketyl-Olefin Radical Cyclizations: Involvement of a Samarium Tridentate Ligate
作者:Gary A. Molander、J. Christopher McWilliams、Bruce C. Noll
DOI:10.1021/ja963195c
日期:1997.2.1
diastereoselection in a samarium(II) iodide-promoted ketyl-olefin cyclization reaction has been achieved using tartramide-derived keto allylic acetals as chiral auxiliaries. The unique features of the reaction include the fact that remote diastereoselection is achieved in a radical process and that high levels of stereochemical induction are observed at both new stereocenters created in the transformation. The source
Mild preparation of allylic tartaramide acetals in DMF
作者:Gary A. Molander、J.Christopher McWilliams
DOI:10.1016/0040-4039(96)01637-1
日期:1996.9
The mildpreparation of (E)-allylic acetals derived from N,N,N′,N′-tetramethyltartaramide is described. The desired chiral acetals are obtained by transacetalization of the corresponding acyclic acetals with a catalytic amount of pyridinium p-toluenesulfonate in DMF at room temperature.