Enantioselective Ruthenium-Catalyzed Benzocyclobutenone–Ketol Cycloaddition: Merging C–C Bond Activation and Transfer Hydrogenative Coupling for Type II Polyketide Construction
作者:Brett R. Ambler、Ben W. H. Turnbull、Sankar Rao Suravarapu、Maulen M. Uteuliyev、Nancy O. Huynh、Michael J. Krische
DOI:10.1021/jacs.8b05724
日期:2018.7.25
The first enantioselective intermolecular metal-catalyzed cycloadditions of benzocyclobutenones via C-C bond oxidative addition are described. In the presence of a ruthenium(0) complex modified by ( R)-DM-SEGPHOS, tetralone-derived ketols and benzocyclobutenones combine to form cycloadducts with complete regio- and diastereoselectivity and high enantioselectivity. Using this method, the "bay region"
描述了苯并环丁烯酮通过 CC 键氧化加成的第一个对映选择性分子间金属催化环加成。在 (R)-DM-SEGPHOS 修饰的钌 (0) 络合物存在下,四氢萘酮衍生的酮醇和苯并环丁烯酮结合形成具有完全区域和非对映选择性以及高对映选择性的环加合物。利用该方法制备了安古环素天然产物沙霉素的“湾区”亚结构。
Tandem Ring Expansion of Alkenyl Benzocyclobutenol Derivatives into Substituted Naphthols
Facile Access to Versatile Polyaromatic Building Blocks: Selectively Protected Benzocyclobutenedione Derivatives via Regioselective [2+2] Cycloaddition of -Alkoxybenzyne and Ketene Silyl Acetal
facile, divergent access to highly oxygenated benzocyclobutene derivatives was developed via the regioselective [2+2] cycloaddition of α-alkoxybenzynes and ketene silyl acetals. The cycloadducts could be converted to selectively protected alkoxybenzocyclobutenediones, an attractive class of compounds for the synthesis of polyaromatic compounds. As one possible application, divergent access to a regioisomer