Novel allene-acetylene cross-condensation catalyzed by palladium complexes
作者:Barry M. Trost、Georg Kottirsch
DOI:10.1021/ja00163a062
日期:1990.3
We report our preliminary results, in which we succeeded in achieving such a condensation with an unusual dependence of product regioselectivity on the choice of catalyst
我们报告了我们的初步结果,其中我们成功地实现了这种缩合,并且产物区域选择性异常依赖于催化剂的选择
Synthesis of 1,4-Enamino Ketones by [3,3]-Rearrangements of Dialkenylhydroxylamines
作者:Wiktoria H. Pecak、Jongwoo Son、Amy J. Burnstine、Laura L. Anderson
DOI:10.1021/ol501230e
日期:2014.7.3
4-enamino ketones has been achieved through the [3,3]-rearrangement of dialkenylhydroxylamines generated from the addition of N-alkenylnitrones to electron-deficient allenes. The mild conditions required for this reaction, and the simultaneous installation of a fluorenyl imine N-protecting group as a consequence of the rearrangement, avoid spontaneous cyclization of the 1,4-enamino ketones to form the
Asymmetric Olefin Isomerization of Butenolides via Proton Transfer Catalysis by an Organic Molecule
作者:Yongwei Wu、Ravi P. Singh、Li Deng
DOI:10.1021/ja205674x
日期:2011.8.17
general olefin isomerization was realized via biomimetic protontransfer catalysis with a new chiral organic catalyst. A broad range of mono- and disubstituted β,γ-unsaturated butenolides were transformed into the corresponding chiral α,β-unsaturated butenolides in high enantioselectivity and yield in the presence of as low as 0.5 mol % catalyst. Mechanistic studies have revealed the protonation as the
Generation and Rearrangement of
<i>N</i>
,
<i>O</i>
‐Dialkenylhydroxylamines for the Synthesis of 2‐Aminotetrahydrofurans
作者:Jongwoo Son、Tyler W. Reidl、Ki Hwan Kim、Donald J. Wink、Laura L. Anderson
DOI:10.1002/anie.201800908
日期:2018.5.28
provide modular access to these novel rearrangement precursors. The scope of this de novo synthesis of simple nucleoside analogues has been explored to reveal trends in diastereoselectivity and reactivity. In addition, a base‐promoted ring‐opening and Mannich reaction has been discovered to covert 2‐aminotetrahydrofurans to cyclopentyl β‐aminoacid derivatives or cyclopentenones.
Highly Chemo-, Regio-, and Stereoselective [3+2]-Cyclization of Activated and Deactivated Allenes with Alkenyl Fischer Carbene Complexes: A Straightforward Access to Alkylidenecyclopentanone Derivatives
作者:José Barluenga、Rubén Vicente、Luis A. López、Miguel Tomás
DOI:10.1021/ja0586788
日期:2006.5.1
ne derivatives are synthesized by the rhodium(I)-catalyzed [3+2]-cyclization reaction of chromium alkenyl(methoxy)carbene complexes 1 and activated allenes. Thus, amidocyclopentenes 4a-n are readily available from N-allenylamides 2a-c, while phenoxyallene 2e gives access to phenoxycyclopentenes 6. In turn, the cyclization reaction with (alkoxycarbonyl)allenes 3 leads to (alkoxycarbonyl)methylidenecyclopentenes