Cyclic (Alkyl)(amino)carbene Ligands Enable Cu‐Catalyzed Markovnikov Protoboration and Protosilylation of Terminal Alkynes: A Versatile Portal to Functionalized Alkenes**
作者:Yang Gao、Sima Yazdani、Aaron Kendrick、Glen P. Junor、Taeho Kang、Douglas B. Grotjahn、Guy Bertrand、Rodolphe Jazzar、Keary M. Engle
DOI:10.1002/anie.202106107
日期:2021.9
donating cyclic (alkyl)(amino)carbene (CAAC) ligands. Using this method, both alkyl- and aryl-substituted alkynes are coupled with a variety of boryl and silyl reagents with high α-selectivity. The reaction is scalable, and the products are versatile intermediates that can participate in various downstream transformations. Preliminary mechanistic experiments shed light on the role of CAAC ligands in this
N-Heterocyclic Carbene-Catalyzed Hydrosilylation of Styryl and Propargylic Alcohols with Dihydrosilanes
作者:Qiwu Zhao、Dennis P. Curran、Max Malacria、Louis Fensterbank、Jean-Philippe Goddard、Emmanuel Lacôte
DOI:10.1002/chem.201101822
日期:2011.8.29
Reducing alkenes to tears: Addition of structurally diverse N‐heterocyclic carbenes (NHCs) to silicon allows the reduction of propargylic and styryl alcohols through an organocatalyzed silylation/direct hydride transfer tandem reaction (see scheme). Catalytic turnover is enabled by the switch to and from hypervalent silicon. This provides a new synthetic application of NHC–main group element complexes
CAAC Boranes. Synthesis and characterization of cyclic (alkyl) (amino) carbene borane complexes from BF<sub>3</sub> and BH<sub>3</sub>
作者:Julien Monot、Louis Fensterbank、Max Malacria、Emmanuel Lacôte、Steven J Geib、Dennis P Curran
DOI:10.3762/bjoc.6.82
日期:——
In situ formation of two cyclic (alkyl) (amino) carbenes (CAACs) followed by addition of BF(3)*Et(2)O provided the first two examples of CAAC-BF(3) complexes: 1-(2,6-diisopropylphenyl)-3,5,5-trimethyl-3-phenylpyrrolidin-2-ylidene trifluoroborane, and 2-(2,6-diisopropylphenyl)-3,3-dimethyl-2-azaspiro[4.5]decan-1-ylidene trifluoroborane. These CAAC-BF(3) complexes are robust compounds that are stable