Stereoselective Synthesis and Thromboxane A2 (TXA2) Receptor Antagonistic Activity of Optically Active Phenol Derivatives.
作者:Shoji FUKUMOTO、Zen-ichi TERASHITA、Yasuko ASHIDA、Shinji TERAO、Mitsuru SHIRAISHI
DOI:10.1248/cpb.44.749
日期:——
Enantiomers of four potent nonprostanoid thromboxane A2 (TXA2) receptor antagonists, (+/-)-7-(4-fluorophenyl)-7-(2-hydroxyphenyl)heptanoic acids (1-4), were synthesized stereoselectively by direct ortho-alkylation of phenols under modified Mitsunobu conditions. The reaction of 5 eq of phenols (6a-c) with 1 eq of (S)- or (R)-methyl 7-(4-fluorophenyl)-7-hydroxyheptanoate ((S)- or (R)-7) afforded ortho-alkylated
四种有效的非前列腺素血栓烷A2(TXA2)受体拮抗剂的对映体(+/-)-7-(4-氟苯基)-7-(2-羟苯基)庚酸(1-4)是通过直接邻位烷基化立体选择性合成的在改良的Mitsunobu条件下制备苯酚。5eq的酚(6a-c)与1eq的(S)-或(R)-甲基7-(4-氟苯基)-7-羟基庚酸酯((S)-或(R)-7)反应,得到对映选择性的对烷基烷基苯酚衍生物(6a-c),化学产率为33%至42%,ee为90%至93%。在这些化合物中,(R)-对映体(1-4)表现出有效的TXA2受体拮抗活性,而(S)-异构体(3)的活性低得多。特别是,化合物(R)-3强烈抑制U-46619诱导的人血小板聚集(IC50 = 48 nM),并且还显示出非常有效的抑制作用,最低有效剂量(MED)为0.3 mg / kg(po