若干胺氰基(吡咯基)硼烷配合物[A·BH(NC 4 H ^ 4)CN]含有手性硼原子被选自钠cyanohydrodipyrrolylborate-tridioxane的反应制备1 [加入NaBH(NC 4 H ^ 4)2 CN·3C 4 H 8 O 2 ]与胺盐酸盐以及通过从适当的4-氰基吡啶络合物[4-CNC 5 H 4 N·BH(NC 4 H 4)CN]进行碱交换。带有sp 2 N原子的胺可提供多种碱度的稳定络合物(p K a= 0.8-9.7),与sp 3杂化N的胺类相反,后者只有更强的碱(p K a 7.3 7.3)才能产生稳定的络合物(主要是仲胺和叔胺)。这些化合物在中性和碱性介质中会发生水解,而在强酸中,它们会通过在吡咯基的α-C原子上质子化产生稳定的硼离子。化合物(-)-(S)-α-苯乙胺-(-)-氰基吡咯烷硼烷和(+)-(R)-α-苯乙胺-(+)-氰基吡咯烷硼烷已制备成纯净
Vinylogous nucleophilic catalysis. Tertiary amine promoted hydrolysis of 1-alkene-1-sulfonyl chlorides
作者:James Frederick King、John Henry Hillhouse、Stanisław Skonieczny
DOI:10.1139/v84-339
日期:1984.10.1
We present evidence that the reactions of ethenesulfonyl chloride (1) and trans-1-propene-1-sulfonyl chloride (3) with water in the presence of pyridine, trimethylamine, and a number of other tertiary amines proceed primarily by way of an initial vinylogous substitution reaction to form the cationic sulfene, , which subsequently reacts with water either by addition (and deprotonation) to form the betaine
Compositions comprising anti-fibrotic agent(s) and/or polymeric compositions can be used in various medical applications including the prevention of surgical adhesions, treatment of inflammatory arthritis, treatment of scars and keloids, the treatment of vascular disease, and the prevention of cartilage loss.
Electrical devices (e.g., cardiac rhythm management and neurostimulation devices) for contact with tissue are used in combination with an anti-scarring agent (e.g., a cell cycle inhibitor) in order to inhibit scarring that may otherwise occur when the devices are implanted within an animal.
Soft tissue implants and anti-scarring agents
申请人:Hunter L. William
公开号:US20050152945A1
公开(公告)日:2005-07-14
Soft tissue implants (e.g., breast, pectoral, chin, facial, lip, and nasal implants) are used in combination with an anti-scarring agent in order to inhibit scarring that may otherwise occur when the implant is placed within an animal.