Transformed steroids. CXXVII. Synthesis of 16α,17α-isopropylidenedioxy-pregn-4-en-11β, 21-diol-3,20-dione, an intermediate product of the preparation of decanide, triamcinolone, and triamcinolone acetonide
作者:A. P. Krymov、A. V. Kamernitskii、B. I. Demchenko、I. V. Vesela、V. I. Tropina、L. I. Ioanis'yan
DOI:10.1007/bf00765225
日期:1983.2
21-unsubstituted compounds. As a result of finding appropriate conditions, completion of the reaction of oxide (I) with carbethoxyhydrazine and AcOH was successfully achieved after 24 h and the 16,21-diacetate of pregn-5en-3~,16a,17a,21-tetraol-20-one 20-carbethoxyhydrazone (II) was formed in good yield. The free ketone diacetate (IV) was obtained by removing the hydrazone protection with acetylacetone. Treatment
继续我们在该领域的研究,我们研究了 carbethoxyhydrazone 将其引入 21-乙酰氧基-20-酮并将其除去的行为,并确定了合成癸烷、16a,17a-isopropylidenedidedioxypregna-l,4diene-llB 的可能性, 21-dioi-3,20-dione,它是一种已知的具有抗炎作用的糖皮质激素制剂 [3]。16a,17a-epoxypregn-5-en-3B,21-diol-20-one (I) 的 21-乙酸酯作为原料。先前在 [4] 中已经确定,在一系列 21-乙酰氧基(羟基)取代的类固醇中,20-腙的 16a,17a 氧化物环的打开速度比 21-未取代化合物的情况要慢得多。由于找到了合适的条件,24 小时后,氧化物 (I) 与 carbethoxyhydrazine 和 AcOH 的反应成功完成,pregn-5en-3~,16a,17a,21-tetraol-20-one