Synthesis of spirocyclic β- and γ-sultams by one-pot reductive cyclization of cyanoalkylsulfonyl fluorides.

Synthesis of spirocyclic β- and γ-sultams by one-pot reductive cyclization of cyanoalkylsulfonyl fluorides.
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DOI:
10.1002/ejoc.202000351
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发表时间:
2021-12-21
影响因子:
2.8
通讯作者:
Zhersh S
Zhersh S
中科院分区:
化学3区
文献类型:
--
作者:
Stepannikova KO;Vashchenko BV;Grygorenko OO;Gorichko MV;Cherepakha AY;Moroz YS;Volovenko YM;Zhersh S

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本发明公开了将新的富含sp 3的氰基烷基磺酰氟一锅法分子内环化为螺环β-或γ-磺内酰胺。该方法依赖于腈基还原,然后在温和条件下(NaBH 4,NiCl 2·6 H2O的MeOH溶液)磺酰化由此形成的氨基。环化以相当高的效率(48- 84%,10个实施例)在高达30 g规模上顺利进行。氰烷基磺酰氟中间体可以通过β-官能化的烷腈的S-亲核取代或α-烷硫基乙腈的双烷基化,然后与Cl 2氧化氯化并进一步与KHF 2反应来获得。标题单-和双官能磺内酰胺是用于药物发现和有机合成的先进的富含sp3的结构单元,提供了新的取代模式和模拟饱和氮杂环如吡咯烷/吡咯烷酮的框架。通过环状氰基磺酰氟的一锅还原环化反应,开发了螺环γ-和β-磺内酰胺-用于有机合成和药物发现的高级构件的多克合成。
One-pot intramolecular cyclization of novel sp3-enriched cyanoalkylsulfonyl fluorides into spirocyclic β- or γ-sultams is disclosed. The method relies on nitrile group reduction followed by sulfonylation of amino group thus formed upon mild conditions (NaBH4, NiCl2·6H2O in MeOH). Cyclization proceeds smoothly with considerable efficiency (48–84%, 10 examples) on up to 30 g scale. The cyanoalkylsulfonyl fluoride intermediates can be obtained via S-nucleophilic substitution in β-functionalized alkanenitriles or double alkylation of α-alkylthioacetonitrile, followed by oxidative chlorination with Cl2 and further reaction with KHF2. The title mono- and bifunctional sultams are advanced sp3-enriched building blocks for drug discovery and organic synthesis providing novel substitution patterns and frameworks mimicking saturated nitrogen heterocycles such as pyrrolidine/pyrrolidone. Multigram synthesis of spirocyclic γ- and β-sultams – advanced building blocks for organic synthesis and drug discovery – via one-pot reductive cyclization of cyclic cyano sulfonyl fluorides is developed.
新型吡昔康类似物的设计,合成,抗伤害感受和抗炎活性。
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