Stereospecific Synthesis of Cyclobutylboronates through Copper(I)-Catalyzed Reaction of Homoallylic Sulfonates and a Diboron Derivative
作者:Hajime Ito、Takashi Toyoda、Masaya Sawamura
DOI:10.1021/ja101793a
日期:2010.5.5
A copper(I)-catalyzed stereospecific reaction for the preparation of cis- and trans-1-silyl-2-borylcyclobutanes as well as 1-phenyl-2-borylcyclobutanes is reported. (Z)- and (E)-Homoallylic methanesulfonates were converted to the corresponding trans- and cis-cyclobutane derivatives, respectively, in the presence of a CuCl/dppp catalyst, bis(pinacolato)diboron, and K(O-t-Bu)/THF. Stereospecific derivatizations
Stereoselective Synthesis of Dihydropyrans <i>via</i> Vinylsilane-Terminated Cyclizations of Ester-Substituted Oxycarbenium Ion Intermediates
作者:Cindy Semeyn、Richard H. Blaauw、Henk Hiemstra、W. Nico Speckamp
DOI:10.1021/jo970369f
日期:1997.5.1
The Regioselectivity of 1,3-Disubstituted Allylmetal Species Towards Electrophiles: 1-(Trimethylsilyl)alk-2-enylpotassium Compounds
作者:Manfred Schlosser、Livia Franzini
DOI:10.1055/s-1998-2060
日期:1998.5
Anti-hydroalumination of Homo- and bishomopropargyl alcohols
作者:Shengming Ma、Fang Liu、Ei-ichi Negishi
DOI:10.1016/s0040-4039(97)00764-8
日期:1997.6
The reaction of omega-Me3Si- or omega-Me3Ge-substituted 3-butyn-1-ol, 4-pentyn-1-ol, and their derivatives with DIBAL-H and a small trialkylalane, e.g., Me3Al or Et3Al, at 23 degrees C gives, after iodinolysis, the corresponding (Z)-4-iodo-3-buten-1-ols and (Z)-5-iodo-4-penten-1-ols in a highly stereo- and regioselective manner, most probably via endo-dig mode cyclic anti-hydroalumination, while treatment of omega-carbosubstituted 3-butyn-1-ols with Red-Al or LiAlH4 at high temperatures followed by iodinolysis can give the corresponding (Z)-4-iodo-3-buien-1-ols also in a highly regio- and stereoselective manner. (C) 1997 Elsevier Science Ltd.
Transition-metal catalyzed silylzincation and silylalumination of acetylenic compounds