Selective intramolecular cleavage of the carbon-silicon bond by palladium salts
作者:Jean-Marc Valk、Jaap Boersma、Gerard van Koten
DOI:10.1016/0022-328x(94)87166-3
日期:1994.12
intramolecularly coordinating dimethylaminomethyl group were prepared and treated with Li2PdCl4 or Pd(OAc)2. Highly selective cleavage of the aryl- CSi bond took place to give the corresponding arylpalladium complexes. Similar reactions were observed for benzylic trimethylsilyl compounds. The yields of the reactions with L2PdCl4 varied from 66 to 94%, but yields were > 90% when Pd(OAc)2 was used.
An efficient and selective method for metal- and oxidant-free deaminated esterification of tertiary amines is presented. In this protocol, ynoates play a key role to activate the Csp3−N bond through a process of in situ generation of zwitterionic salts. The transformations show that Csp3−N bond in the zwitterionic species has a lower dissociation energy than Csp2−N bond, leading to break preferentially