Olefin Dihydroxylation Using Nitroarenes as Photoresponsive Oxidants.

Olefin Dihydroxylation Using Nitroarenes as Photoresponsive Oxidants.
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DOI:
10.1002/anie.202214508
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发表时间:
2023-02-13
影响因子:
16.6
通讯作者:
Leonori, Daniele
Leonori, Daniele
中科院分区:
化学1区
文献类型:
--
作者:
Hampton, Charlotte;Simonetti, Marco;Leonori, Daniele

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邻位二醇在天然和合成分子中是丰富的,并且也是贯穿有机合成的有价值的中间体。由于烯烃原料的广泛范围和可用性,烯烃二羟基化是获得这些衍生物的有效策略。OsO 4是实现这种转化最常用的试剂之一,但其高毒性和成本仍然令人担忧。在此,我们提出了一个机制上不同的策略,烯烃二羟基化使用硝基芳烃作为光响应氧化剂。在紫色LED照射下,这些物质与各种烯烃进行[3+2]-光环化加成,得到稳定的1,3,2-二恶唑烷中间体。这些物质可以在溶液中积累,然后原位还原为所需的二醇,利用易于获取且易于处理的固体试剂作为H2替代物。光激发的硝基芳烃可以与Pd介导的氢化结合使用,作为烯烃二羟基化的锇替代物。
Vicinal diols are abundant among natural and synthetic molecules, and also represent valuable intermediates throughout organic synthesis. Olefin dihydroxylation is an effective strategy to access these derivatives owing to the broad range and availability of alkene feedstocks. OsO4 is among the most used reagents to achieve this transformation, yet its high toxicity and cost remain concerning. Herein, we present a mechanistically distinct strategy for olefin dihydroxylation using nitroarenes as photoresponsive oxidants. Upon purple LEDs irradiation, these species undergo a [3+2]‐photocycloaddition with a wide range of olefins to give stable 1,3,2‐dioxazolidine intermediates. These species can be accumulated in solution and then reduced in situ to the desired diols, utilising readily accessible and easy to handle solid reagents as H2 surrogates. Photoexcited nitroarenes ca be used, in conjunction with Pd‐mediated hydrogenation, as osmium surrogates for olefin dihydroxylation.
电化学驱动的立体选择方法,用于从乙烯烯和DMF中使用的Syn-1,2-二醇衍生物。
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