Metal-Catalyzed Ring-Opening of Alkylidenecyclopropanes: New Access to Building Blocks with an Acyclic Quaternary Stereogenic Center
作者:Samah Simaan、Alexander F. G. Goldberg、Stephane Rosset、Ilan Marek
DOI:10.1002/chem.200902656
日期:2010.1.18
Open sesame! A selective metal‐catalyzed ringopening of alkylidenecyclopropane derivatives leads to various functionalized acyclic derivatives possessing challenging quaternary stereocenters. The key feature of this transformation is that the ringopening is faster than the reductive elimination and is highly regioselective; a single ring‐opened product was always observed and the stereointegrity
Cyclopropenylcarbinol Derivatives as New Versatile Intermediates in Organic Synthesis: Application to the Formation of Enantiomerically Pure Alkylidenecyclopropane Derivatives
作者:Samah Simaan、Ahmad Masarwa、Elinor Zohar、Amnon Stanger、Philippe Bertus、Ilan Marek
DOI:10.1002/chem.200901074
日期:2009.8.24
The copper‐catalyzed carbomagnesiation (or hydrometalation) reaction of chiralcyclopropenylcarbinolderivatives, obtained by means of a kinetic resolution of secondary allylic alcohols, leads to an easy and straightforward preparation of enantiomericallypurealkylidenecyclopropanederivatives. The reaction mechanism is composed of a syn‐carbometalation followed by a syn‐elimination reaction. To gain
Hydroformylation Reaction of Alkylidenecyclopropane Derivatives: A New Pathway for the Formation of Acyclic Aldehydes Containing Quaternary Stereogenic Carbons
作者:Samah Simaan、Ilan Marek
DOI:10.1021/ja100544c
日期:2010.3.31
The rhodium-catalyzed hydroformylation reaction of methylene- and alkylidenecyclopropanederivatives proceeds under mild conditions to lead to the exclusive formation of linear aldehydes and the stereointegrity of the quaternary carbon center remains unaffected in the process.