In this work, a novel C(sp 3 )–C(sp2 ) cross-dehydrogenative-coupling method is developed to react benzoxazin-2-one derivatives with various indoles. As a result, combined use of ball milling and Fe( ii ) catalysis leads to rapid coupling of 1,4-benzoxazinones with derivatives of indole. Under the conditions, derivatives of 1 couple with various indoles at room temperature to produce good yields of
The sp3-C–H peroxidation of 3,4-dihydro-1,4-benzoxazin-2-ones was achieved. C(sp3)–OO bond could be further converted into C(sp3)–C(sp3), C(sp3)–C(sp2), C(sp3)–C(sp), C–P and CO bond by late stage functional group transformations.
Iron-Catalyzed C(<i>sp</i>
<sup>3</sup>
)−C(<i>sp</i>
<sup>3</sup>
) Bond Formation in 3,4-Dihydro-1,4-benzoxazin-2-ones
作者:Jie Dong、Wenjian Min、Haitao Li、Zhengjun Quan、Caixia Yang、Congde Huo
DOI:10.1002/adsc.201700816
日期:2017.11.23
A convenient iron-catalyzed oxidative dehydrogenative coupling reaction of 3,4-Dihydro-1,4-benzoxazin-2-ones with malonic esters or ketones was performed under mild reaction conditions to construct alkyl–alkyl C(sp3)−C(sp3) bonds. This transformation can be catalyzed efficiently by magnetically recoverable iron nanoparticles and the catalyst can be recycled easily for 7 times without decreasing activity
C(sp3)–C(sp3) oxidative dehydrogenative coupling reaction of 1,4-benzoxazin-2-ones with malonate esters was developed under mild conditions to obtain the respective ester malonates in high yields. Reactions take place in [omim]FeCl4, acting as both the solvent and the catalyst. Under [omim]Cl/FeCl3-DDQ conditions, derivatives of 1 coupled with malonate 2 to give the target molecules within 1–2 h time
A versatile switching method for N- or O-alkylation of 2-aminophenols using ionic liquids: Selective access to benzo[1,4]oxazine-2-one and benzo[1,4]oxazine-3-one derivatives
A new method is developed for efficient and chemoselective synthesis of benzo[1,4]oxazineone derivatives. By the choice of an appropriate ionic liquid, the process is directed towards selective O- or N-alkylation to give the desired isomeric structures, as the major product of the reaction. In the presence of choline hydroxide, benzo[1,4]oxazine-3-one derivatives are formed, while by using choline