Highly Enantioselective Syntheses of Homopropargylic Alcohols and Dihydrofurans Catalyzed by a Bis(oxazolinyl)pyridine−Scandium Triflate Complex
作者:David A. Evans、Zachary K. Sweeney、Tomislav Rovis、Jason S. Tedrow
DOI:10.1021/ja011983i
日期:2001.12.1
Lewisacid promoted reactions of allylsilanes and allenylsilanes provide access to important building blocks for natural product synthesis. 1 For example, trimethylsilylallenes function as propargylic anion equivalents in aldehydeadditionreactions (eq 1, Path A).2 If the silicon center is sterically congested, the normal addition pathway is suppressed and functionalized dihydrofurans are produced
γ-Trimethylsilyl-substituted allylzirconcenes in organic synthesis. Stereoselective synthesis of terminal 1,3-butadienes and functionalized vinylsilanes
作者:Jin-Hong Pi、Xian Huang
DOI:10.1016/j.tetlet.2004.01.053
日期:2004.3
hydrozirconation of trimethylsilyl-substituted terminal allenes, react with aldehydes at the γ-position to give 1,3-butadienes in one step with good stereoselectivity and undergo conjugate addition to α,β-unsaturatedaromaticketones at the α-position to selectively afford functionalized vinylsilanes in the presence of catalytic CuBr·SMe2.
Stereoselective synthesis of both geometric isomers of γ-(trimethylsilyl)allylboranes and the diastereoselective condensations with aldehydes
作者:Yu Gui Gu、Kung K. Wang
DOI:10.1016/0040-4039(91)80678-y
日期:1991.6
Hydroboration of allenylsilanes 1 produces the Z isomers 10 as the kinetic product, leading to hydroxyallylsilanes 15 after condensation with hexanal, whereas the E isomers 4 and 12 are thermodynamically more stable, affording 9 predominantly.
A highly regio‐ and stereoselective copper‐catalyzed borylcupration of 1,2‐allenylsilanes affords an unexpected regioreversed allylic boronate bearing an extra C−Si bond at the 3‐position, with a thermodynamically disfavored Z geometry. Such stereodefined allylic boronates containing an extra alkenyl silane moiety are very useful organodimetallic reagents for organic synthesis.
Silicon-Induced Phenanthrene Formation from Benzynes and Allenylsilanes
作者:Jih Ru Hwu、Sharada P. Swain
DOI:10.1002/chem.201203738
日期:2013.5.17
Now directly feasible: The silicon atom in allenylsilanes enabled their reaction with two equivalents of benzynes to generate (α‐phenanthrenyl)vinylsilanes in good to excellent yields through an unprecedented [2+2+2] pathway (see scheme).