Synthesis of 1,2,3,4-tetrahydro-.BETA.-carboline derivatives as hepatoprotective agents. IV. Positional isomers of 1,2,3,4-tetrahydro-2-methylthiothiocarbonyl-.BETA.-carboline-3-carboxylic acid and its 1-alkylated derivatives.
作者:YUTAKA SAIGA、IKUO IIJIMA、AKIHIKO ISHIDA、TOSHIKAZU MIYAGISHIMA、NORIO TAKAMURA、TOKURO OH-ISHI、MAMORU MATSUMOTO、Yuzo MATSUOKA
DOI:10.1248/cpb.35.3705
日期:——
Two tetrahydro-β-carboline-1-and-4-carboxylic acids (1b, c) and the corresponding hydroxymethyl derivatives (2b, c), which are positional isomers of the 3-carboxylic acid (1a) and its 3-hydroxymethyl derivative (2a), were synthesized and tested for hepatoprotective activity against carbon tetrachloride (CCl4) -induced liver damage in mice. The hepatoprotective activity of these positional isomers decreased in the following order;1a> 1b> 1c> and 2a > 2b>2c. The effect of alkyl substitution at the 1 position of 1a and 2a was also examined with the cis and trans isomers (5a, b-14a, b). Compounds with small alkyl groups such as Me and Et showed potent activity. Lengthening of the alkyl group generally caused a decrease in activity. In a series of the stereoisomers of the 3-carboxylic acids (5a, b-9a, b), the cis isomers tend to be more active than the trans counterparts.
合成了两种四氢-β-咔啉-1和-4-羧酸(1b,c)及相应的羟甲基衍生物(2b,c),它们是3-羧酸(1a)及其3-羟甲基衍生物(2a)的位置异构体,并测试了它们对四氯化碳(CCl4)诱导的小鼠肝损伤的保肝活性。这些位置异构体的保肝活性依次降低:1a>1b>1c>和2a>2b>2c。顺式和反式异构体(5a、b-14a、b)也检测了 1a 和 2a 1 位上烷基取代的影响。带有小烷基(如 Me 和 Et)的化合物显示出强大的活性。烷基加长一般会导致活性降低。在一系列 3-羧酸立体异构体(5a、b-9a、b)中,顺式异构体的活性往往高于反式异构体。