Chemical modification of glycyrrhetinic acid in relation to the biological activities.
作者:SHOJI SHIBATA、KUNIO TAKAHASHI、SHINGO YANO、MASATOSHI HARADA、HIROSHI SAITO、YASUSHI TAMURA、AKIRA KUMAGAI、KAZUHIRO HIRABAYASHI、MIDORI YAMAMOTO、NOBUYUKI NAGATA
DOI:10.1248/cpb.35.1910
日期:——
18β-Olean-12-ene-3β, 30-diol (deoxoglycyrrhetol) (4a) was prepared with a view to eliminating pseudoaldosteronism, a side-effect of glycyrrhetinic acid (1b), which is the sapogenin of Licorice saponin, glycyrrhizin (1a), while maintaining or enhancing the therapeutic activities. On reduction of the 11-keto and 30-carboxyl groups of 1b with NaAlH2- (OCH2CH2OCH3) 2, olean-12-ene-3β, 11β, 30-triol (9) and olean-12-ene-3β, 11α, 30-triol (10) were obtained. On catalytic hydrogenation of 9 and 10 with Pd-C as a catalyst, 4a was formed in an overall yield of 80%. On treatment with conc. HCl, 9 yielded 18β-olean-9 (11), 12-diene-3β, 30-diol (11a), while 10 yielded olean-11, 13 (18) -diene-3β, 30-diol (12a). Mono-and di-β-carboxy-propionyl and mono-and di-ο-pbthaloyl esters of 4a, lla and 12a were prepared to increase the hydrophilic character. The competitive inhibition of 5β, Δ4-reductase of corticosteroids in the liver which is caused by lb to induce pseudoaldosteronism was not observed in the case of 4a. Compounds 4a, 11a and 12a and their β-carboxypropionyl and ο-phthaloyl esters were studied pharmacologically, and showed antiulcerogenic, antiallergic and antiinflammatory activities.
18β-烯-12-烯-3β, 30-醇(去氧甘草醇)(4a)的制备旨在消除甘草酸(1b)的副作用假性醛固酮症,这是甘草皂苷甘草苷(1a)的薯蓣皂苷,同时保持或增强其治疗活性。通过用NaAlH2-(OCH2CH2OCH3)2还原1b的11-酮和30-羧基,获得了烯-12-烯-3β, 11β, 30-三醇(9)和烯-12-烯-3β, 11α, 30-三醇(10)。用Pd-C作为催化剂对9和10进行催化氢化反应,最终产率为80%得到了4a。用浓盐酸处理9时,生成了18β-烯-9(11)-12-烯-3β, 30-醇(11a),而10则生成了烯-11, 13(18)-烯-3β, 30-醇(12a)。制备了4a、11a和12a的单-和双-β-羧基-丙酰基及单-和双-邻-苯二甲酰基酯,以增强其亲水性。与1b引起的假性醛固酮症不同,在4a的情况下未观察到在肝脏中对皮质类固醇的5β, Δ4-还原酶的竞争抑制。化合物4a、11a和12a及其β-羧基丙酰基和邻-苯二甲酰基酯在药理学上进行了研究,显示出抗溃疡生成、抗过敏和抗炎活性。