Photochemical O−H Functionalization Reactions of Cyclic Diazoamides
作者:Claire Empel、Dennis Verspeek、Sripati Jana、Rene M. Koenigs
DOI:10.1002/adsc.202000818
日期:2020.11.4
Herein, we describe the photochemical O−H functionalization reaction of acidic alcohols with cyclic diazoamides. We studied the O−H functionalization reaction of different fluorinated and non‐fluorinated alcohols to give the corresponding ether products in high yields (43 examples, up to 97% yield). Furthermore, we performed studies to evaluate a photoexcited proton transfer reaction pathway in comparison
Rearrangement of an Intermediate Cyclopropyl Ketene in a Rh<sup>II</sup>-Catalyzed Formal [4 + 1]-Cycloaddition Employing Vinyl Ketenes as 1,4-Dipoles and Donor–Acceptor Metallocarbenes
作者:Kevin X. Rodriguez、Nicolai Kaltwasser、Tiffany A. Toni、Brandon L. Ashfeld
DOI:10.1021/acs.orglett.7b00618
日期:2017.5.19
formal [4 + 1]-cycloaddition approach toward spirooxindole cyclopentenones is described. The diastereoselective cyclopropanation of vinyl ketenes with diazooxindoles as C1 synthons initiated a relatively mild formal [1,3]-migration of an intermediate cyclopropyl ketene to provide spirooxindoles in good to excellent yields (36–99%).
C(sp2)–H Bond Multiple Functionalization in Air for Construction of Tetrahydrocarbazoles with Continuous Quaternary Carbons and Polycyclic Diversification
作者:Longlong Song、Dan Ni、Shikun Jia、Rou Pi、Suzhen Dong、Fan Yang、Jie Tang、Shunying Liu
DOI:10.1021/acs.orglett.0c00145
日期:2020.3.6
The C(sp2)-H function of indole ketone with diazo compound via a rhodium(II)-catalyzed intramolecular electrophilic trapping reaction under mild conditions in air was demonstrated. The established methodology provided a highly efficient approach for direct synthesis of mutisubstituted tetrahydrocarbazoles with continuous quaternary carbons. The resulting products facilitate further modification to
Privilege-Structure-Oriented Three-Component Asymmetric Aminomethylation: Assembly of Chiral 3-Aminomethyl Indolones
作者:Zhenghui Kang、Dan Zhang、Xinfang Xu、Wenhao Hu
DOI:10.1021/acs.orglett.9b03787
日期:2019.12.20
The asymmetric aminomethylation reaction of 3-diazooxindoles with electronic-rich arenes and N,O-acetals cooperatively catalyzed by achiral dirhodium complex and chiral phosphoric acid is reported. The reaction provides a novel method for the facilesynthesis of chiral 3-aminomethyl oxindoles with an all-carbon quaternary center in good yields (82-98%) with high to excellent enantioselectivities (up