Clean protocol for deoxygenation of epoxides to alkenes via catalytic hydrogenation using gold,Catalysis Science & Technology

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Clean protocol for deoxygenation of epoxides to alkenes via catalytic hydrogenation using gold
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2020-11-05 , DOI: 10.1039/d0cy01695k
Jhonatan L. Fiorio _{1,

2,

3,

4,

5} , Liane M. Rossi _{1,

2,

3,

4,

5}

Affiliation

The epoxidation of olefin as a strategy to protect carbon–carbon double bonds is a well-known procedure in organic synthesis, however the reverse reaction, deprotection/deoxygenation of epoxides is much less developed, despite its potential utility for the synthesis of substituted olefins. Here, we disclose a clean protocol for the selective deprotection of epoxides, by combining commercially available organophosphorus ligands and gold nanoparticles (Au NP). Besides being successfully applied in the deoxygenation of epoxides, the discovered catalytic system also enables the selective reduction N-oxides and sulfoxides using molecular hydrogen as reductant. The Au NP catalyst combined with triethylphosphite P(OEt)₃ is remarkably more reactive than solely Au NPs. The method is not only a complementary Au-catalyzed reductive reaction under mild conditions, but also an effective procedure for selective reductions of a wide range of valuable molecules that would be either synthetically inconvenient or even difficult to access by alternative synthetic protocols or by using classical transition metal catalysts.

中文翻译：

清洁规程，可使用金通过催化加氢将环氧化物脱氧为烯烃

烯烃的环氧化是保护碳-碳双键的一种策略，是有机合成中众所周知的方法，然而，尽管逆反应，环氧化物的脱保护/脱氧反应却很少开发，尽管它可以用于合成取代的烯烃。在这里，我们通过结合市售的有机磷配体和金纳米颗粒（Au NP）公开了一种用于环氧化物选择性脱保护的清洁方法。除了成功地用于环氧化物的脱氧中，发现的催化体系还能够使用分子氢作为还原剂选择性还原N-氧化物和亚砜。金NP催化剂与亚磷酸三乙酯P（OEt）_3结合与仅金纳米颗粒相比，它的反应性明显更高。该方法不仅是在温和条件下的互补的Au催化还原反应，而且是一种选择性还原各种有价值的分子的有效方法，这些分子在合成上不方便，或者通过替代合成方案或使用经典方法难以获得，过渡金属催化剂。

更新日期：2020-11-13

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