ポリマー固定化エコ反応剤の開発 : 生理活性分子,高機能性分子の次世代合成ストラテジー
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Chalcones with the 2’-benzoyloxy group can be transformed into the corresponding isoflavones by actionof polymer-supported IBD (PSIBD, poly[4-(diacetoxy)iodo]styrene) with TsOH. The advantage of the reactionis no liberation of PhI and reuse of the reagent. Meanwhile, fulleropyrrolidines have been very welcomed in acommunity of a fullerene science. But sometimes the synthesis ends up with disappointing yields of theproducts. We found that the dipolar cycloaddition of an azomethine ylide, i.e., 2-phenyl-N-benzylideneglycinemethyl ester, supported on a Wang resin, proceeded feasibly with C60 and the objective fulleropyrrolidines wereafforded in good yields (>75%). The method is expected to be utilized with wide range of application and it istherefore able to provide a compound library of modified fullerenes which is hard to be obtained by othermethods employed so far.In order to introduce carboxyl groups into a thermoresponsive dehydroalanine polymers andhydrogels, N-isobutyryldehydroalanine methyl ester (iBDHAM) were copolymerized with its carboxylicacid derivative (iBDHA) for linear polymers and with a bisdehydroalanine derivative,N,N’-succinylbisdehydroalanine (SBDHA) for hydrogels. The linear copolymer, P(iBDHA-co-iBDHAM)([iBDHA]=23-81%), showed LCST behavior in deionized water, but the LCST values were highlypolymer concentration-dependent. It is concluded that effect of carboxyl groups introduced into thepolymer chain is larger in hydrogels than in linear polymer. This is probably due to the effect ofdissociative carboxyl groups on the osmotic pressure of hydrogels.
- 徳島大学の論文
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