Enantioselective Reduction of α,β-Unsaturated Acylsilanes by Chiral Lithium Amides
摘要:
Reaction of beta-substituted acryloylsilanes I with lithium amides II affords a-silyl allylic alcohols III in high enantiomeric excess (>99%) via formal hydride transfer from the chiral lithium amide.
Synthesis of α-substituted α,β-unsaturated acylsilanes
摘要:
alpha-Deprotonation of tert-butyldimethylsilyloxy allene is followed by silyl migration from oxygen to carbon. The resulting C-nucleophile adds to aldehydes to generate alpha,beta-unsaturated acylsilanes.(C) 1998 Elsevier Science Ltd. All rights reserved.
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
作者:Hans J. Reich、Martha J. Kelly、Richard E. Olson、Ronald C. Holtan
DOI:10.1016/s0040-4020(01)88593-8
日期:1983.1
A series of silylketones has been prepared by appropriate manipulation of ⇌-silylated allenol ethers. Among the compounds prepared were alkenyl, alkynyl and acyl silylketones. The spectroscopic properties of representative members of these classes of compounds have been measured, and some of their chemical reactions studied Diels-Alder cycloadditions of vinyl and alkynyl silylketones proceed smoothly
9−12 with a base and an alkylating agent affords (Z)-δ-siloxy-γ,δ-unsaturated pentanenitrile derivatives via a tandem process that involves the formation of a cyclopropane derivative by epoxy nitrilecyclization followed by Brook rearrangement and an anion-induced cleavage of the cyclopropane ring. Exclusive formation of a (Z)-derivative from trans-epoxides is explained by the reaction pathway that involves
A New Strategy for Construction of Eight-Membered Carbocycles by Brook Rearrangement Mediated [6 + 2] Annulation
作者:Kei Takeda、Hidekazu Haraguchi、Yasushi Okamoto
DOI:10.1021/ol0353767
日期:2003.10.1
text] A newly developed strategy for construction of eight-memberedcarbocycles via [6 + 2] annulation that involves the combination of beta-alkenoyl acylsilanes and a vinyllithium derivative is described. A unique feature of this annulative approach is that it enables in one operation and a stereoselective manner construction of eight-membered ring systems containing useful functionalities for further
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.