Regio- and stereoselective hydrosilylation of immobilized terminal alkynes
作者:Palle J. Pedersen、Jonas Henriksen、Charlotte H. Gotfredsen、Mads H. Clausen
DOI:10.1016/j.tetlet.2008.08.043
日期:2008.10
Regio- and stereoselective hydrosilylation of terminalalkynes on solid support using diisopropyl hydrosilanes yielding β-(E)-vinyl silanes with excellent selectivity is reported. The hydrosilylation is catalyzed by Pt(DVDS)/P(iBuNCH2CH2)3N (DVDS = 1,3-divinyl-1,1,3,3-tetramethyl-disiloxane), in which the bulky proazaphosphatrane ligand plays a key role for the selectivity. The immobilized products
Incorporation of carbon dioxide into phthalides via ligand-free copper-catalyzed direct carboxylation of benzoxasiloles
作者:Thanh V. Q. Nguyen、José A. Rodríguez-Santamaría、Woo-Jin Yoo、Shū Kobayashi
DOI:10.1039/c7gc00917h
日期:——
The directcarboxylation of benzoxasiloles with carbondioxide proceeded smoothly under mild conditions using copper iodide as a catalyst to afford phthalides after an acid work-up. Broad substrate scope and application of this methodology for the synthesis of natural products highlight the synthetic utility of this protocol.
Modular Approach to Reductive C<sub>sp2</sub>–H and C<sub>sp3</sub>–H Silylation of Carboxylic Acid Derivatives through Single-Pot, Sequential Transition Metal Catalysis
modular approach to catalytic reductive Csp2–H and Csp3–H silylation of carboxylic acid derivatives encompassing esters, ketones, and aldehydes. Choice of either an Ir(I)/Rh(I) or Rh(I)/Rh(I) sequence leads to either exhaustive reductive ester or reductiveketone/aldehyde silylation, respectively. Notably, a catalyst-controlled direct formation of doubly reduced silyl ethers is presented, specifically