Browsing by Author "Luo, Shun-Yuan"

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2-Allylphenyl glycosides as glycosyl donors for sugar coupling
(2012-05-01)
Luo, Shun-Yuan
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Tripathi, Ashish
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Zulueta, Medel Manuel L.
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Hung, Shang-Cheng
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應用化學系
Glycosylations employing 2-allylphenyl glycoside, a new type of stable glycosyl donor, were optimized and explored with a variety of acceptors promoted by ICl/AgOTf. The utility of the protocol was further demonstrated with an efficient synthesis of the disaccharide fragment of bleomycins. (C) 2012 Elsevier Ltd. All rights reserved.
pi-Extended Coumarins Derived with Nonhydrolyzable Iminophosphoranes as Two-Photon-Excited Fluorophores
(2020-07-17)
Hsia, Liang-Yu
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Chen, Hsin-Ni
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Chiang, Chun-Hao
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Hung, Ming-Yang
;
Wei, Hao-Keng
Novel coumarin-iminophosphorane (IPP) fluorophores that have stable resonance contributions from aza-ylides were formed by using the nonhydrolysis Staudinger reaction. The N=P formation reaction kinetics obey the conventional Staudinger reaction. The absorption and emission profiles of the coumarin-IPP derivatives can be fine-tuned: an electron-donating group at PPh3 enhances absorption and fluorescence, whereas an electron-withdrawing group at C-3 drives absorption and emission peaks toward blue-light wavelengths. Two-photon adsorption, accompanied by anti-Stokes fluorescence, is achieved under near-infrared femtosecond laser excitation.