A catalytic tandem olefin migration-aldol condensation process
with allylic carbinols and aryl aldehydes was performed with 0.5
mol% of an amphiphilic polystyrene-poly(ethylene glycol) (PS-PEG)
resin supported phosphine-ruthenium complex in water as
a single reaction medium under heterogeneous conditions to give the
corresponding aldols with syn selectivity.
Inverse stereoselectivity (anti selectivity)
was observed when the reaction was carried out in the presence of
K2CO3.
tandem reaction - aldol condensation - aqueous
media - polymer support - ruthenium catalyst