Concise synthesis of functionalized benzocyclobutenones
作者:P.-H. Chen、Nikolas A. Savage、Guangbin Dong
DOI:10.1016/j.tet.2014.03.080
日期:2014.7
to access functionalized benzocyclobutenones from 3-halophenol derivatives is described. This modified synthesis employs a [2+2] cycloaddition between benzynes generated from dehydrohalogenation of aryl halides using LiTMP and acetaldehyde enolate generated from n-BuLi and THF, followed by oxidation of the benzocyclobutenol intermediates to provide benzocyclobutenones. The [2+2] reaction can be run on
Highly Enantioselective Rh-Catalyzed Carboacylation of Olefins: Efficient Syntheses of Chiral Poly-Fused Rings
作者:Tao Xu、Haye Min Ko、Nikolas A. Savage、Guangbin Dong
DOI:10.1021/ja309978c
日期:2012.12.12
the first highly enantioselective Rh-catalyzed carboacylation of olefins via C-C bond activation of benzocyclobutenones. Good yields and excellent enantioselectivities (92-99% ee, 14 examples) were obtained for substrates with various steric and electronic properties. In addition, fully saturated poly-fused rings were prepared from the carboacylation products through a challenging catalytic reductive
在这里,我们报告了第一个通过苯并环丁烯酮的 CC 键活化对烯烃进行高度对映选择性的 Rh 催化碳酰化。对于具有各种空间和电子特性的基材,获得了良好的产率和出色的对映选择性(92-99% ee,14 个实例)。此外,通过具有挑战性的催化还原脱芳构化方法,由碳酰化产物制备了完全饱和的聚稠环。这些研究提供了一种独特的方法来制备手性碳骨架,这些骨架是用传统方法难以获得的。
Rhodium-Catalyzed Regioselective Carboacylation of Olefins: A CC Bond Activation Approach for Accessing Fused-Ring Systems
作者:Tao Xu、Guangbin Dong
DOI:10.1002/anie.201202771
日期:2012.7.23
Cut and sew: A rhodium‐catalyzed regioselective carboacylation reaction of benzocyclobutenones was developed (see scheme). Directed by the pendant olefins, the C1C2 bond is selectively cleaved rather than the C1C8 bond. Subsequent alkene insertion leads to complex fused‐ring systems. This reaction provides facile access to natural‐product‐like polycyclic structures in a chemoselective and atom‐economic