EN
Supramolecular photochirogenesis is a new
strategy for circumventing the inherent difficulties
encountered in conventional photochirogenesis, i.e. the
interactions associated with geometrically less-defined,
short-lived excited states, by confining a prochiral
substrate(s) in a chiral supramolecular environment(s)
prior to photoexcitation. This rather simple, but very
successful, strategy has been applied to a variety of
chiral photoreactions. However, a stoichiometric, or
even excess amount of supramolecular host is often
needed to ensure full complexation of the substrate,
and achieve the optimum stereochemical outcome.
This apparent drawback has recently been removed by
introducing a sensitizing moiety to the supramolecular
host, or by bathochromically shifting the absorption
band of substrate through Lewis acid, or charge-transfer
complexation. Recent progress in catalytic supramolecular
photochirogenesis will be reviewed.