Nucleic Acid Related Compounds. 116. Nonaqueous Diazotization of Aminopurine Nucleosides. Mechanistic Considerations and Efficient Procedures with <i>tert-</i>Butyl Nitrite or Sodium Nitrite<sup>,</sup><sup>1</sup>
作者:Paula Francom、Zlatko Janeba、Susumu Shibuya、Morris J. Robins
DOI:10.1021/jo0204101
日期:2002.9.1
Nonaqueous diazotization-dediazoniation of two types of aminopurine nucleoside derivatives has been investigated. Treatment of 9-(2,3,5-tri-O-acetyl-beta-D-ribofuranosyl)-2-amino-6-chloropurine (1) with SbCl(3)/CH(2)Cl(2) was examined with benzyltriethylammonium (BTEA) chloride as a soluble halide source and tert-butyl nitrite (TBN) or sodium nitrite as the diazotization reagent. Optimized yields (>80%)
Biotransformation of halogenated nucleosides by immobilized Lactobacillus animalis 2′- N -deoxyribosyltransferase
作者:Claudia N. Britos、María José Lapponi、Valeria A. Cappa、Cintia W. Rivero、Jorge A. Trelles
DOI:10.1016/j.jfluchem.2016.04.012
日期:2016.6
in an active derivative (2.6 U/g) able to obtain 1.75 mg/g of 5-fluorouracil-2′-deoxyriboside, an antimetabolite known as floxuridine, used in gastrointestinal cancertreatment. Furthermore, immobilized LaNDT was satisfactorily used to obtain at short reaction times other halogenated pyrimidine and purine 2′-deoxynucleosides such as 6-chloropurine-2′-deoxyriboside (4.9 U/g), 6-bromopurine-2′-deoxyriboside
从无细胞提取物中开发了一种具有2'- N-脱氧核糖基转移酶(NDT)活性的固定化生物催化剂动物乳杆菌NDT(La NDT)。La NDT进行纯化,表征,然后通过离子相互作用固定。优化了不同的工艺参数,得到了一种活性衍生物(2.6 U / g),该活性衍生物能够获得1.75 mg / g的5-氟尿嘧啶-2'-脱氧核糖苷(一种被称为氟尿苷的抗代谢药),用于胃肠道癌症治疗。此外,固定La无损检测可令人满意地用于在短反应时间获得其他卤代嘧啶和嘌呤2'-脱氧核苷,例如6-氯嘌呤-2'-脱氧核糖核苷(4.9 U / g),6-溴嘌呤-2'-脱氧核糖核苷(4.3 U / g) ,6-氯-2-氟嘌呤-2'-脱氧核糖苷(5.4 U / g),5-溴-2'-脱氧尿苷(2.8 U / g)和5-氯-2'-脱氧尿苷(1.8 U / g)化合物药物在抗病毒或抗肿瘤治疗中的意义。此外,将生物催化剂的量增加至每体积单位
Biotransformation of halogenated 2′-deoxyribosides by immobilized lactic acid bacteria
作者:Claudia N. Britos、Valeria A. Cappa、Cintia W. Rivero、Jorge E. Sambeth、Mario E. Lozano、Jorge A. Trelles
DOI:10.1016/j.molcatb.2012.04.004
日期:2012.7
An efficient and green bioprocess is herein reported to obtain halogenated nucleosides by transglycosylation using immobilized lactic acid bacteria (LAB). Lactobacillus animalis ATCC 35046 showed a yield of 95% at 0.5 h to synthesize 5-fluorouracil-2'-deoxyriboside (floxuridine). Calcium alginate was the best matrix for whole-cell immobilization by entrapment. Its productivity was 87 mg/L h in a continuous bioprocess. When adsorption techniques were evaluated, DEAE-Sepharose was the support which showed higher microbial load, its productivity being 53 mg/L h. Additionally, this microorganism was able to produce 5-bromouracil-2'-deoxyriboside, 6-chloropurine-2'-deoxyriboside and 6-bromopurine-2'-deoxyriboside. (C) 2012 Elsevier B.V. All rights reserved.
Nucleic Acid Related Compounds. 118. Nonaqueous Diazotization of Aminopurine Derivatives. Convenient Access to 6-Halo- and 2,6-Dihalopurine Nucleosides and 2‘-Deoxynucleosides with Acyl or Silyl Halides<sup>1</sup>
作者:Paula Francom、Morris J. Robins
DOI:10.1021/jo020625a
日期:2003.1.1
6-dichloropurine nucleoside 2, and acetyl chloride/BTEA-NO2 was equally effective ( approximately 85%, without chromatography). TMS-Br/tert-butyl nitrite/dibromomethane gave crystalline 2-bromo-6-chloro analogue 3 (85%). (Chloro or bromo)-dediazoniation of 3',5'-di-O-acetyl-2'-deoxyadenosine (4) gave the 6-[chloro (5, 63%) or bromo (6, 80%)]purine deoxynucleosides, and 2',3',5'-tri-O-acetyladenosine