新型可用于荧光标记的α-氰基丙烯酸酯单体的合成及在小鼠活体成像中的应用

设计合成了新型含有荧光基团的α-氰基丙烯酸酯单体,并与其它α-氰基丙烯酸酯单体共聚,得到产生荧光的聚氰基丙烯酸酯材料.将其包埋在小鼠背部肌肉层,可获得良好的荧光成像效果.通过对荧光强度的监测,初步研究了聚氰基丙烯酸酯材料中的侧链酯基在小鼠体内的降解情况.单体合成是以蒽合氰基丙烯酸和4,4'-二甲氧基三苯基-氨基己醇为原料,得到蒽合氰基丙烯酸(4,4'-二甲氧基三苯基-氨基己醇)酯,脱保护后再将异硫氰酸荧光素以化学键合的方式标记在末端氨基上,脱蒽还原烯双键后,得到可用于荧光标记的α-氰基丙烯酸(异硫氰酸荧光素-氨基己醇)酯单体.反应中间体及单体结构采用核磁共振氢谱和质谱进行表征.该单体及其高聚物均可在激发光(488 nm)和发射光(525 nm)条件下观察到明显荧光.

Synthesis of a New Cyanoacrylate Monomer and Its Application in Fluorescence Imaging in vivo

A new cyanoacrylate monomer with fluorescein isothiocyanate( FITC) labeling was synthesized. It could copolymerize with any other cyanoacrylate monomers and result in copolymer being able to produce fluorescence. Well fluorescence imaging could be got when the copolymer was embedded in subcutaneous tissue of Sprague-Dawley ( SD ) mice. We also discussed the degradation pattern of polycyanoacrylate by monitoring the fluorescence intensity with time. The synthesis was started with anthracene /cyanoacrylate acid adduct and 6-(4,4'-dimethoxytriphenylmethyl)-amino-1-hexanol. After deprotection of 4,4'-dimethoxytriphe-nylmethyl group from intermediate anthracene/6-(4,4'-dimethoxytriphenylmethyl)-amino-1-hexanol cyanoacrylate adduct, FITC was labeled onto the amino group. The target product was finally got by reduction of the ethylenic bond. Structure of intermediates and target compound were identified by 1 H NMR and MS spectroscopy. Both the monomer and polymer could be observed fluorescence around 525 nm wavelength by an exciting light at 488 nm.