Platinum-Catalyzed Hydrosilylations of Internal Alkynes: Harnessing Substituent Effects to Achieve High Regioselectivity
作者:Douglas A. Rooke、Eric M. Ferreira
DOI:10.1002/anie.201108714
日期:2012.3.26
Rule of thumb: The high yielding title reaction is described with a focus on understanding the factors that govern the regioselectivity of the process (see scheme). Electronic, steric, and functional group properties all influence the selectivity, an understanding of which allows the selective formation of trisubstituted vinylsilanes, which are synthetically useful compounds for accessing stereodefined
A Readily Accessible Class of Chiral Cp Ligands and their Application in Ru
<sup>II</sup>
‐Catalyzed Enantioselective Syntheses of Dihydrobenzoindoles
作者:Shou‐Guo Wang、Sung Hwan Park、Nicolai Cramer
DOI:10.1002/anie.201802244
日期:2018.5.4
Chiral cyclopentadienyl (Cpx) ligands have a large application potential in enantioselective transition‐metal catalysis. However, the development of concise and practical routes to such ligands remains in its infancy. We present a convenient and efficient two‐step synthesis of a novel class of chiral Cpx ligands with tunable steric properties that can be readily used for complexation, giving CpxRhI
手性环戊二烯(Cp x)配体在对映选择性过渡金属催化中具有巨大的应用潜力。但是,开发这种配体的简洁实用的方法仍处于起步阶段。我们提出了一种方便有效的两步合成具有可调空间特性的新型手性Cp x配体的方法,可以很容易地用于络合,得到Cp x Rh I,Cp x Ir I和Cp x Ru II复合体。后者在用炔烃对氮杂苯并降冰片二烯进行对映选择性环化中得到了证明,后者可提供高达98:2 er的二氢苯并吲哚,显着优于现有的由双萘基衍生的Cp x配体。
Reaction of (trimethylstanyl)copper(I) reagents with α,β-acettylenic esters
作者:Edward Piers、J.Michael Chong、Howard E. Morton
DOI:10.1016/0040-4020(89)80065-1
日期:1989.1
The reactions of α,β-actylenic esters 1 with the (trimethylstannyl) copper (I) reagents 4–7 provide good to excellent yields of the corresponding β-trimethylstannyl α,β-unsaturated esters 10 and (or) 11. In nearly all cases studied, except for the reactions involving substrate 1i, the stereochemical outcome of the transformations can be controlled by judicious choice of reagent and (or) reaction conditions
Stereoselective exocyclic double bond formation via vinyl radical cyclization
作者:Simon P. Munt、Eric J. Thomas
DOI:10.1039/c39890000480
日期:——
A stereoselective route to 2,6-cis-disubstituted 4-methoxycarbonylmethylenetetrahydropyrans has been developed which uses a vinylradicalcyclization to establish the geometry of the exocyclicdoublebond.
Efficient Stereoselective Syntheses of Constrained Glutamates via Michael-Induced Ring Closing Reactions
作者:Christian Schmidt、Uli Kazmaier
DOI:10.1002/ejoc.200700965
日期:2008.2
ester enolates are highly efficient nucleophiles for the synthesis of conformationally constrainedglutamatesvia domino sequences of Michael additions and subsequent ring closures (MIRC). This protocol allows the generation of 3–6-membered ring systems in high yields and excellent diastereoselectivities. Depending on the reaction conditions either carbocyclic or heterocyclic ring systems are obtained.