Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5188387 | Polymer | 2007 | 9 Pages |
Abstract
Ornithine- and lysine-based novel N-propargylamides, N-α-tert-butoxycarbonyl-N-δ-fluorenylmethoxycarbonyl-l-ornithine-Nâ²-propargylamide (1), N-α-tert-butoxycarbonyl-N-É-fluorenylmethoxycarbonyl-l-lysine-Nâ²-propargylamide (2), N-α-fluorenylmethoxycarbonyl-N-δ-tert-butoxycarbonyl-l-ornithine-Nâ²-propargylamide (3), and N-α-fluorenylmethoxycarbonyl-N-É-tert-butoxycarbonyl-l-lysine-Nâ²-propargylamide (4) were synthesized and polymerized with a rhodium catalyst. Polymers with moderate molecular weights were obtained in good yields. Poly(1)-poly(4) showed strong Cotton effects in THF, whose sign and wavelength depended on the substituents. They were satisfactorily converted into the corresponding polymers [poly(1a)-poly(4a)] with free amino groups. Poly(1a) and poly(2a) also formed a helix, while poly(3a) and poly(4a) did not. Poly(1a) and poly(2a) decreased the CD intensity by the addition of m- and o-phthalic acids.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Ruiyuan Liu, Fumio Sanda, Toshio Masuda,