Isolation and structural elucidation of the degradation products of pregnanediol disulfate obtained by hot acid hydrolysis (Clinical analysis on steroids. XXI).
作者:ITSUO YOSHIZAWA、RYOKO OHUCHI、KYOKO NAGATA、SHINJI ITOH、NORIO KAWAHARA
DOI:10.1248/cpb.30.2474
日期:——
Besides the main products, 17α-ethyl-17β-methyl-18-nor-5β-androst-13-en-3α-ol (7a), 17α-methyl-D-homo-5β-androstane-3α, 17aβ-diol (8), and 17α-methyl-17aβ-chloro-D-homo-5β-androstan-3α-ol (9), other minor degradation products of pregnanediol 3, 20-disulfate (2) were obtained under reflux in 3 N hydrochloric acid, and were structurally identified by comparison with synthetic specimens. The steroidal mono olefins isolated were 5β-pregn-3-en-20α-ol (10a), 5β-pregn-2-en-20α-ol (11a), 5β-pregn-20-en-3α-ol (12a), and 5β-pregn-17 (20)-en-3α-ol (13a). The Z-isomer of 13a, 5β-pregn-17 (20)-en-3α-ol (14a), was detected by gas chromatography and identified by gas chromatography-mass spectrometric comparison with synthetic compound. Steroidal dienes were obtained as a mixture of Δ2-and Δ3-compounds having partial D-ring structures corresponding to 7a, 12a, and 13a. Although it was a minor product, 5β-pregnane-3α, 20β-diol (16) was also obtained, and its isolation suggests the formation of a C20-carbonium ion in the course of the hydrolysis. The yield of intact steroid, pregnanediol (1), was only 18.4% of the total products obtained.
除了主要产品17α-乙基-17β-甲基-18-去氢-5β-雄甾-13-烯-3α-醇(7a)、17α-甲基-D-同雄甾-5β-醇(8)和17α-甲基-17β-氯-D-同雄甾-5β-醇(9),在3 N盐酸回流条件下还获得了孕醇-3,20-二硫酸酯(2)的其他少量降解产物,并通过与合成样品的比较对其结构进行了鉴定。分离得到的类固醇单烯包括5β-孕-3-烯-20α-醇(10a)、5β-孕-2-烯-20α-醇(11a)、5β-孕-20-烯-3α-醇(12a)和5β-孕-17(20)-烯-3α-醇(13a)。以气相色谱法检测到的13a的Z异构体为5β-孕-17(20)-烯-3α-醇(14a),并通过与合成化合物的气相色谱-质谱比较进行了鉴定。分离的类固醇二烯作为混合物包括具有部分D环结构的Δ2和Δ3化合物,对应于7a、12a和13a。虽然它是一个少量产物,5β-孕烷-3α、20β-二醇(16)也被获得,其分离表明在水解过程中形成了C20碳正离子。完整类固醇孕醇(1)的产率仅为获得的总产品的18.4%。