Revisit to the Reaction ofO-Phenylene Diamine with Thiosemicarbazide to Give Benzimidazole-2-Thione Rather than Benzotriazine-2-Thione and its Glycosylation
摘要:
Reaction of o-phenylene diamine with thiosemicarbazide did not give benzotriazine-2-thione 2 as reported, although the product was found to be benzimidazole-2-thione 3. Glycosylation of 3 with acetobromo sugars 4a-4b gave the respective thioglycosides 7a-7d in addition to minor products of the nucleosides 8a and 8b, in the case of the gluco- and galacto-analogs, respectively. The regioselectivity of glycosylation reaction has been investigated.
Specific Features of Phase Transfer Catalytic Glycosylation of 2-Mercaptobenzimidazole
作者:T. A. Chupakhina、V. O. Kur’yanov
DOI:10.1134/s1068162020060047
日期:2020.11
Abstract The reaction of 2-acetamido-3,4,6-tri- O -acetyl-2-deoxy-α-D-glucopyranosyl chloride with 2‑mercaptobenzimidazole under conditions of the phasetransfercatalysis was studied and specific features of the phasetransfer process were evaluated. It was found that the corresponding N - and S -β-D-glucosaminides were the major glucosaminylation products. Glucosaminylation of 2-mercaptobenzimidazole
摘要 研究了2-乙酰氨基-3,4,6-三-O-乙酰基-2-脱氧-α-D-吡喃葡萄糖基氯与2-巯基苯并咪唑在相转移催化条件下的反应及其相转移的特点。过程进行了评价。发现相应的N-和S-β-D-氨基葡萄糖是主要的氨基葡萄糖化产物。2-巯基苯并咪唑在无水二氯甲烷-氢化钠相转移催化体系中的氨基葡萄糖化显示出区域特异性。合成化合物的结构使用 1 H NMR 光谱和质谱进行表征。