已报道2-Ureido-4- [ 1H ]-嘧啶酮通过四氢键合系统在CDCl 3中的二聚化常数> 10 6 M - 1来二聚。二聚化常数K dim取决于溶剂以及所存在的环取代基,其中先前为烷基(例如R 1 = Me)和芳族部分(例如R 1 = p -NO 2 C 6 H 4, R 1 = C 6 H 2(OC 13 H 27)3)已并入C-6位置。为评估替代的,可官能化的,供电子基团对异构体的二聚体基序和互变异构体分布的影响,已实现了在C-6位具有氨基苯基官能团的化合物的合成。NMR光谱化学位移分析表明,化合物2(R 1 = p -NH 2 C 6 H 4,R 2 = C 6 H 13)在DMSO -d 6中以2-ureido-4-pyrimidinol二聚DADA阵列存在。二聚化常数为46 M - 1被确定。这是首次在高极性溶剂纯DMSO中观察到脲基嘧啶酮四氢键合DADA阵列。制备化合物2的偶氮衍生物5,其也采用在DMSO-
已报道2-Ureido-4- [ 1H ]-嘧啶酮通过四氢键合系统在CDCl 3中的二聚化常数> 10 6 M - 1来二聚。二聚化常数K dim取决于溶剂以及所存在的环取代基,其中先前为烷基(例如R 1 = Me)和芳族部分(例如R 1 = p -NO 2 C 6 H 4, R 1 = C 6 H 2(OC 13 H 27)3)已并入C-6位置。为评估替代的,可官能化的,供电子基团对异构体的二聚体基序和互变异构体分布的影响,已实现了在C-6位具有氨基苯基官能团的化合物的合成。NMR光谱化学位移分析表明,化合物2(R 1 = p -NH 2 C 6 H 4,R 2 = C 6 H 13)在DMSO -d 6中以2-ureido-4-pyrimidinol二聚DADA阵列存在。二聚化常数为46 M - 1被确定。这是首次在高极性溶剂纯DMSO中观察到脲基嘧啶酮四氢键合DADA阵列。制备化合物2的偶氮衍生物5,其也采用在DMSO-
Disclosed herein is a fibrous tissue sealant in the form of an anhydrous fibrous sheet comprising a first component which is a fibrous polymer containing electrophilic or nucleophilic groups and a second component capable of crosslinking the first component when the sheet is exposed to an aqueous medium, thereby forming a crosslinked hydrogel that is adhesive to biological tissue. The fibrous tissue sealant may be useful as a general tissue adhesive for medical and veterinary applications such as wound closure, supplementing or replacing sutures or staples in internal surgical procedures, tissue repair, and to prevent post-surgical adhesions. The fibrous tissue sealant may be particularly suitable for use as a hemostatic sealant to stanch bleeding from surgical or traumatic wounds.