Photoinduced Proton‐Transfer Reactions for Mild O‐H Functionalization of Unreactive Alcohols
作者:Sripati Jana、Zhen Yang、Fang Li、Claire Empel、Junming Ho、Rene M. Koenigs
DOI:10.1002/anie.201915161
日期:2020.3.27
hexafluoroisopropanol and the diazoalkane acts as an unreactive hydrogen‐bonding complex. Only after photoexcitation does this complex undergo a protonation‐substitution reaction to the reaction product. Investigations on the applicability of this photochemical transformation show that a broad variety of acidic alcohols can be subjected to this transformation and thus demonstrate the feasibility of
Iron-Catalyzed Carbene Insertion Reactions of α-Diazoesters into Si–H Bonds
作者:Hoda Keipour、Thierry Ollevier
DOI:10.1021/acs.orglett.7b02488
日期:2017.11.3
An efficient iron-catalyzed carbene insertion reaction of α-diazo carbonyl compounds into the Si–H bond was developed. A wide range of α-silylesters was obtained in high yields (up to 99%) from α-diazoesters using a simple iron(II) salt as catalyst.
Highly enantioselective Darzens-type epoxidation of diazoesters with glyoxal derivatives was accomplished using a chiral boron–Lewis acid catalyst, which facilitated asymmetric synthesis of trisubstituted α,β-epoxy esters. In the presence of a chiral oxazaborolidinium ion catalyst, the reaction proceeded in high yield (up to 99 %) with excellent enantio- and diastereoselectivity (up to >99 % ee and
Copper(I)-Catalyzed Alkylation of Polyfluoroarenes through Direct CH Bond Functionalization
作者:Shuai Xu、Guojiao Wu、Fei Ye、Xi Wang、Huan Li、Xia Zhao、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201412450
日期:2015.4.7
The copper(I)‐catalyzed alkylation of electron‐deficient polyfluoroarenes with N‐tosylhydrazones and diazo compounds has been developed. This reaction uses readily available starting materials and is operationally simple, thus representing a practical method for the construction of C(sp2)C(sp3) bonds with polyfluoroarenesthroughdirectCHbondfunctionalization. Mechanistically, copper(I) carbene
Catalytic Asymmetric C−H Activation of Alkanes and Tetrahydrofuran
作者:Huw M. L. Davies、Tore Hansen、Melvyn Rowen Churchill
DOI:10.1021/ja994136c
日期:2000.4.1
Rhodiumcarbenoids derived from methyl aryldiazoacetates are capable of effective catalytic asymmetricC−H activation of a range of alkanes and tetrahydrofuran by a C−Hinsertion mechanism. Dirhodium tetrakis(S-(N-dodecylbenzenesulfonyl)prolinate) (Rh2(S-DOSP)4) catalyzed decomposition of methyl aryldiazoacetates in the presence of alkanes results in intermolecularC−Hinsertions with good control