Chemical modification of ansamitocins. III. Synthesis and biological effects of 3-acyl esters of maytansinol.
作者:AKIYOSHI KAWAI、HIROSHI AKIMOTO、YOSHIO KOZAI、KOICHIRO OOTSU、SEIICHI TANIDA、NAOTO HASHIMOTO、HIROAKI NOMURA
DOI:10.1248/cpb.32.3441
日期:——
Several semisynthetic maytansinoids that differ in the structure of the acyl group at the C3 position were prepared by acylation of maytansinol (3) using appropriate carboxylic acids or their active derivatives, and the effects of the compounds on the growth of Tetrahymena pyriformis and the survival of tumor-bearing mice were determined. Among these analogs, the C3 esters having a straight chain aliphatic acyl (11, 12), cycloalkanecarbonyl (18-20) or phenylacetyl group (22), and those having a 2-(N-acetyl-N-methyl) aminohexanoyl (7) or (2-(N-acetyl-N-methyl) aminophenylpropionyl group (8), strongly inhibited the growth of T. pyriformis and exhibited potent activity against B16 melanoma in mice. The potencies were similar to those of maytansine and ansamitocin P-3. The most striking result was the finding that the phenylglycinate (31) was superior to maytansine in terms of its broader effective dose range against ip B16 melanoma and P388 leukemia in mice ; however, higher doses of the phenylglycinate were required.
几种半合成的美坦素类药物,其C3位置的酰基结构不同,是通过使用适当的羧酸或其活性衍生物对美坦醇(3)进行酰化而制备的。研究了这些化合物对梨形兽原虫(Tetrahymena pyriformis)生长和肿瘤-bearing小鼠生存的影响。在这些类似物中,具有直链脂肪酸酰基(11, 12)、环烷酸酰基(18-20)或苯乙酰基(22)的C3酯,以及具有2-(N-乙酰-N-甲基)氨基己酸酰基(7)或2-(N-乙酰-N-甲基)氨基苯丙酸酰基(8)的化合物,极大地抑制了T. pyriformis的生长,并对小鼠的B16黑色素瘤表现出强烈的活性。这些化合物的效力与美坦素和安萨米托新P-3相似。最引人注目的结果是发现苯甘氨酸酯(31)在对小鼠腹腔B16黑色素瘤和P388白血病的有效剂量范围上优于美坦素;然而,需要更高剂量的苯甘氨酸酯。