ol0522283_si_001.pdf (534.14 kB)
Room Temperature Intramolecular Hydro-O-alkylation of Aldehydes: sp3 C−H Functionalization via a Lewis Acid Catalyzed Tandem 1,5-Hydride Transfer/Cyclization
journal contribution
posted on 2005-11-24, 00:00 authored by Stefan J. Pastine, Dalibor SamesThe scope and limitations of intramolecular hydro-O-alkylation of aldehyde substrates leading to spiroketals and bicyclic ketals and aminals
is reported. The direct transformation of tertiary and sterically hindered secondary sp3 C−H bonds into C−O bonds under the action of a
catalytic amount of a variety of Lewis acids is described. The mechanism of these transformations is proposed to involve a tandem hydride
transfer/cyclization sequence.