Studies on the enantioselective catalysis of photochemically promoted transformations: "Sensitizing receptors" as chiral catalysts
A strategy for the enantioselective catalysis of photomediated reactions in solution is described, involving the use of chiral molecular receptors possessing appendant triplet-sensitizing moieties. Energy transfer is selectively directed to bound substrate as a consequence of the distance dependence of triplet-triplet energy transfer. This effect, which is equivalent to a binding-induced rate enhancement, enables substoichiometric chirality transfer from the receptor template to the substrate, as observed in the intramolecular enone-olefin photo [2 + 2]cycloaddition of a quinolone substrate.
Cauble, David F.,Lynch, Vincent,Krische, Michael J.
p. 15 - 21
(2007/10/03)
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