申请人:Syntex (U.S.A.) Inc.
公开号:US04044020A1
公开(公告)日:1977-08-23
Biotin is prepared by (a) ozonizing methylcyclohexene; (b) reacting nitromethane with the methyl-6-oxohexanoate from a to form 7-nitro-6 hydroxyheptanoic acid methyl ester; (c) acylating to form the corresponding 6 acyloxy compound; (d) forming a double bond at the 6 position; (e) reacting the product of d with nitroethanethiol to form dl-7-thia-6-nitromethyl-9-nitro-nonanoic acid methyl ester; (f) forming a furoxan by cyclization; (g) reducing the furoxan and acylating to form dl-2(4-carbomethoxybutyl)-3,4-bis(acylamido)-2,5-dihydro thiophene; (h) selectively hydrogenating to form the 3,4-cis-bis(acylamido)-2,5-dihydro thiophene; and (i) hydrolyzing and cyclizing to form dl-biotin. The products formed at steps (e)-(h) are novel, as are the individual steps (e), (f), (g), and (h).
生物素是通过以下步骤制备的:(a) 臭氧化甲基环己烯;(b) 将硝基甲烷与步骤(a)中的甲基-6-氧代己酸酯反应,形成7-硝基-6-羟基庚酸甲酯;(c) 酰化形成相应的6酰氧化合物;(d) 在6位形成双键;(e) 将步骤(d)的产物与硝基乙硫醇反应,形成dl-7-硫代-6-硝基甲基-9-硝基-壬酸甲酯;(f) 通过环化形成呋喃类化合物;(g) 还原呋喃类化合物并酰化,形成dl-2(4-羧甲氧基丁基)-3,4-双(酰胺基)-2,5-二氢噻吩;(h) 选择性加氢形成3,4-顺式-双(酰胺基)-2,5-二氢噻吩;(i) 水解和环化形成dl-生物素。步骤(e)-(h)中形成的产物是新颖的,步骤(e)、(f)、(g)和(h)也是新颖的。