Conformationally rigid pyrazoloquinazoline α-amino acids: one- and two-photon induced fluorescence†
Jonathan D.
Bell, 
a
David
Nobis,
a
Christopher R.
Wellaway,
b
Andrew G.
Jamieson,
a
Steven W.
Magennis
a
and
Andrew
Sutherland
*a
a
David
Nobis,
a
Christopher R.
Wellaway,
b
Andrew G.
Jamieson,
a
Steven W.
Magennis
a
and
Andrew
Sutherland
*a
Abstract
The synthesis and photophysical properties of a new class of α-amino acid bearing a rigid pyrazoloquinazoline chromophore are described. Confromational constraint of the amino acid side-chains resulted in high emission quantum yields, while the demonstration of two-photon-induced fluorescence via near-IR excitation signifies their potential for sensitive bioimaging applications.
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