Divergent Functionalization of Indoles with Acryloyl Silanes via Rhodium-Catalyzed C–H Activation
作者:Ping Lu、Chao Feng、Teck-Peng Loh
DOI:10.1021/acs.orglett.5b01258
日期:2015.7.2
by rhodium-catalyzed C–H functionalization of indoles with acryloyl silanes was developed, providing a convenient and highly effective method for the synthesis of functionalized acylsilane derivatives. By tuning the reaction condition, this C–H-activation-initiated reaction proceeds divergently with acryloyl silianes to selectively afford alkylation or alkenylation products via hydroarylation or oxidative
A short approach toward new acrolein‐type derivatives, functionalized in position 2 is described. It involves, as the key step, a smooth transformation of acylsilanes into aldehydes by irradiation in water‐organic solvent mixtures. The functionalized enals obtained by this newroute appear as versatile building blocks for the preparation of natural products and/or bioactive compounds.
Under the catalysis of Rh(III), the tricyclic skeleton of furan-fused indanone was obtained based on the C−H activation reaction of sulfoxide ylide as a traceless directing group with acryloyl silane. Moreover, C−H alkenylation could also be achieved when the additives were changed.
作者:Ilhwan An、Edith N. Onyeozili、Robert E. Maleczka
DOI:10.1016/j.tetasy.2010.02.030
日期:2010.3
The enzymatic kinetic resolution of alpha-hydroxysilanes where the silicon bears a variety of substituents has been explored. Reactions were performed on various alpha-hydroxysilanes with several commercially available enzymes, solvents, acetylation reagents, and temperatures. The resulting optically active alpha-hydroxysilanes and their corresponding acetates were obtained in varying yields and ees. (C) 2010 Elsevier Ltd. All rights reserved.
Synthesis of Acylsilanes via Nickel-Catalyzed Reactions of α-Hydroxyallylsilanes
The redox isomerization processes and tandem isomerization-aldolization reactions, mediated by nickel catalysts, offer new versatile entries to acylsilanes. For the second reaction, high diastereoselectivities, up to 98:2, have been obtained with bulky substituents on silicon.