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    • 4. 发明授权
    • Formamido and carboxyamido compounds which can be retained in brain
    • 可以保留在脑中的甲酰氨基和羧酰氨基化合物
    • US5580904A
    • 1996-12-03
    • US211304
    • 1994-06-24
    • Toyoaki IshikuraTeruomi ItoTakashi KatoKazutoshi HorieHiroshi IshiharaTakashi Senou
    • Toyoaki IshikuraTeruomi ItoTakashi KatoKazutoshi HorieHiroshi IshiharaTakashi Senou
    • A61K47/20A61K47/22A61K47/48C07C323/41C07C327/30C07D207/16C07D239/42C07D295/12C07D295/13C07D405/12A61K31/16C07C233/01
    • C07D239/42A61K47/48023A61K47/48061A61K47/48215C07C323/41C07C327/30C07D207/16C07D295/13C07D405/12C07C2101/14
    • According to the present invention, a novel compound group which can pass through blood-brain barrier (BBB) with carrying a drug thereon and stay within brain to release the drug and a well-known compound group having the properties described above are provided.The compound represented by the general formula ##STR1## wherein, R.sup.1 represents C.sub.1-6 alkyl which may be substituted by a group selected from hydroxyl, carboxyl, amino group which may be substituted by C.sub.1-6 alkyl, and a five- to seven-membered saturated heterocyclic ring,R.sup.2 represents hydrogen or C.sub.1-6 alkyl,R.sup.3 represents hydrogen or C.sub.1-6 alkyl which may be substituted by hydroxyl,R.sup.4 represents hydrogen or C.sub.1-6 alkyl,R.sup.5 represents an amino acid residue, or --S--R.sup.6 or --CO--R.sup.6 wherein R.sup.6 represents C.sub.1-14 alkyl which may be substituted by a five- to seven-membered saturated ring; C.sub.2-6 alkenyl; aryl; or a five- to seven-membered saturated ring; or the group represented by the general formula (IVa): ##STR2## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 have the same meanings as defined above, and.multidot..multidot..multidot..multidot..multidot..multidot..multidot..multidot..multidot. represents a single bond or a double bondprovided that at least one of R.sup.1, R.sup.3 and R.sup.5 contains hydroxyl, carboxyl or amino, and a salt thereof.
    • PCT No.PCT / JP93 / 01075 Sec。 371日期:1994年6月24日 102(e)1994年6月24日PCT 1993年7月30日PCT公布。 公开号WO94 / 03424 日本1994年2月17日根据本发明,可以通过血脑屏障(BBB)携带药物并保持在脑内以释放药物的新型化合物组和具有所述性质的公知化合物组 提供以上。 由通式(Ia)表示的化合物,其中,R 1表示可被选自羟基,羧基,可被C 1-6烷基取代的氨基的基团取代的C 1-6烷基, 至7元饱和杂环,R 2表示氢或C 1-6烷基,R 3表示氢或可被羟基取代的C 1-6烷基,R 4表示氢或C 1-6烷基,R 5表示氨基酸残基,或 - S-R6或-CO-R6,其中R6表示可被5至7元饱和环取代的C 1-14烷基; C 2-6烯基; 芳基; 或五至七元饱和环; 或由通式(IVa)表示的基团:其中R 1,R 2,R 3和R 4具有与上述相同的含义,并且+ E,uns xxxxxxxxx + EE表示单键或双键 条件是R 1,R 3和R 5中的至少一个含有羟基,羧基或氨基,及其盐。
    • 8. 发明授权
    • N-acetylcarboxymethylchitosan derivatives and process for preparation
thereof
    • US5463022A
    • 1995-10-31
    • US969307
    • 1993-02-16
    • Kazuhiro InoueTeruomi ItoSatoshi OkunoKatsutoshi Aono
    • Kazuhiro InoueTeruomi ItoSatoshi OkunoKatsutoshi Aono
    • A61K47/48C08B37/08A61K38/00C07G17/00C07K9/00C08B37/00
    • C08B37/003
    • N-acetylcarboxymethylchitosan derivatives are provided by the present invention. They are represented by the following formula (I): ##STR1## wherein R.sub.1 and R.sub.2 individually mean H or carboxymethyl group; P denotes a group R.sub.3 CO--, a group R.sub.4 NH-- or a group R.sub.5 O-- with assuming that R.sub.3 COOH denotes a compound having carboxyl group, R.sub.4 NH.sub.2 denotes a compound having amino group and R.sub.5 OH denotes an alcohol compound; Q stands for H or a group --OH; X represents a peptide chain containing same or different, one to ten amino acids; a.sub.1 and a.sub.2 individually represent zero or a positive integer, provided that both of a.sub.1 and a.sub.2 are not zero at the same time, and b stands for a positive integer; and having the following characteristic values (1)-(4):______________________________________ (1) carboxymethylation degree: 0.5-1.2 (2) molecular weight (as measured 3,000-300,000 by gel filtration method): (3) a/(a + b): 0.01-1 [provided that a = a.sub.1 + a.sub.2 ] (4) P/X ratio (molar ratio): 0.1-1 ______________________________________ P in the formula (I) can be the residue of a pharmaceutical compound. In this case, the substances of the formula (I) are derivatives of the pharmaceutical compound, which derivatives have been improved in the properties such as organotropism in vivo.P in the formula (I) can also be protective groups. In this case, removal of the protective groups from the substances of the formula (I) by deprotection makes it possible to provide such N-acetylcarboxymethylchitosan derivative which is useful as carrier for pharmaceutical compounds and which has the terminals of the so deprotected peptide chains capable of being linked with a pharmaceutical compound.There are further obtained such derivatives of the substances of the formula (I), in which derivatives some of the N-acetylcarboxymethylglucosamine units have been replaced by units having a high solubility in water.