Highly Versatile Enantioselective Conjugate Addition of Grignard Reagents to α,β-Unsaturated Thioesters
作者:Beatriz Maciá Ruiz、Koen Geurts、M. Ángeles Fernández-Ibáñez、Bjorn ter Horst、Adriaan J. Minnaard、Ben L. Feringa
DOI:10.1021/ol702425a
日期:2007.11.1
for the asymmetric copper-catalyzed conjugateaddition of Grignard reagents to alpha,beta-unsaturated thioesters. MeMgBr adds to aromatic alpha,beta-unsaturated thioesters with excellent enantioselectivities and moderate to good yields using Josiphos/CuBr and Tol-BINAP/CuI complexes. The use of bulky Grignard reagents leads to unprecedented enantioselectivities in the 1,4-addition to a broad range
efficiently using a rhodium catalyst. The broad functional-group tolerance and mild conditions of the method have allowed for the two-step decarboxylative borylation of a wide range of aromatic carboxylicacids, including commercially available drugs.
Radical‐Cation‐Induced Crossed [2+2] Cycloaddition of Electron‐Deficient Anetholes Initiated by Iron(III) Salt
作者:Takahiro Horibe、Kei Katagiri、Kazuaki Ishihara
DOI:10.1002/adsc.201901337
日期:2020.2.21
Radical cation‐induced crossed [2+2] cycloaddition of electron‐deficient anetholes was developed with the use of Fe(OTf)3 as an initiator. Various 1,2‐diarylcyclobutanes can be synthesized in high yields with high diastereoselectivity from electron‐deficient anetholes, which have been less explored using conventional methods. This practical reaction system can be used for a decagram‐scale reaction