第 50 卷第 2 期 | | Vol. 50 No. 2 | 2020 年 4 月 | Apr 2020 |
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所属栏目:医药及中间体
2,7-二氮杂-螺[3,5]壬烷-2-甲酸叔丁酯的合成 |
胡 涛,梁慧兴,罗宏军
(扬子江药业集团有限公司,江苏 泰州 225321) |
摘 要:报道了2,7-二氮杂-螺[3,5]壬烷-2-甲酸叔丁酯一种新的合成方法。以双(2-氯乙基)胺盐酸盐(1)为起始原料,经氮苄基化后与氰乙酸乙酯双烷基化生成4,4-双取代的N-苄基哌啶(3),哌啶甲酸乙酸酯(3)经硼氢化钠还原成羟基化合物(4),随后对甲苯磺酰化成磺酸酯(5),氰基经氢化铝锂还原后发生分子内协同反应环化成2-氮杂螺环丁烷(6),经与二碳酸叔丁酯反应生成2-N-Boc产物(7),最后氢解脱去苄基等7步反应得到标题化合物2,7-二氮杂-螺[3,5]壬烷-2-甲酸叔丁酯,总收率为36%,1H NMR和MS确证了中间体和目标产物结构。 |
关键词:双(2-氯乙基)胺;氰乙酸乙酯;硼氢化钠;氢化铝锂;氮螺杂环丁烷 |
中图分类号:TQ463 文献标识码:A 文章编号:1009-9212(2020)02-0041-04 |
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Synthesis of 2,7-Diaza-spiro[3,5]nonane-2-carboxylic acid tert-butyl ester |
HU Tao, LIANG Hui-xing, LUO Hong-jun
(Yangtze River Pharmaceutical Group Co.,Ltd., Taizhou, 225321, China) |
Abstract:A novel synthetic approach of 2,7-diaza-spiro[3,5]nonane-2-carboxylic acid tert-butyl ester was described. N-Benzylation product 2 of bis(2-chloroethyl)amine hydrochloride 1 was reacted with ethyl 2-cyanoacetate, giving 1-benzyl-4-cyano-4-ethoxycarbonylpiperidine 3. This ester was reduced into alcohol 4 with sodium tetrahydroborate and the following sulfonylation with 4-methylbenzenesulfonyl chloride provided Tos product 5. The subsequent reduction with lithium aluminum hydride gave intra-cyclized aztidine 6, followed by Boc carboxylation and hydrogenolysis debenzyl afforded titled compound TM with an overall yield of 36%. The related intermediates and compounds were confirmed by 1H NMR and MS. |
Key words:bis(2-chloroethyl)amine; ethyl 2-cyanoacetate; sodium tetrahydroborate; lithium aluminum hydride; spiro aztidine |
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作者简介:胡 涛(1975-),男,河南信阳人,高级工程师,博士,主要从事药物合成及工艺开发研究(E-mail:hutao@yangzijiang.com)。
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收稿日期:2019-11-06
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