are described for the synthesis of the corresponding tetrahydropyridines and pyran derivatives, respectively. In particular, the use of pyridine-carboxaldehydes for aza-silyl-Prins reaction led to either a symmetrical triarylmethane or two new bicyclic compounds. 4-Fluorinated-2-substituted tetrahydropyranderivatives were also obtained in the oxa-Prins cyclization with good selectivity in favor of
Redox selective reactions of organo-silicon and -tin compounds
作者:Jun-ichi Yoshida、Keiji Nishiwaki
DOI:10.1039/a803343i
日期:——
The C-Si and C-Sn sigma orbitals are higher in energy than C-H or C-C sigma orbitals, and therefore can interact with neighboring pi systems, non-bonding orbitals of heteroatoms, and other sigma systems such as those of C-Si and C-Sn, Such interactions cause an increase of the HOMO level which in turn favors electron transfer. On the basis of this effect various types of redox selective reactions of organo-silicon and -tin compounds have been developed.
Electrooxidative Inter- and Intramolecular Carbon−Carbon Bond Formation Using Organothio Groups as Electroauxiliaries
s having a carbon-carbon double bond in an appropriate position using Bu(4)NBF(4) as the supporting electrolyte leads to the effective cyclization and the introduction of the fluoride to one of the formal olefinic carbon. The present study demonstrates the effectiveness of organothiogroups as electroauxiliaries in electrooxidativeinter- and intramolecularcarbon-carbonbondformation.