27943-47-1Relevant articles and documents
Stereoselective coordination of C5-symmetric corannulene derivatives with an enantiomerically pure [RhI(nbd*)] metal complex
Bandera, Davide,Baldridge, Kim K.,Linden, Anthony,Dorta, Reto,Siegel, Jay S.
, p. 865 - 867 (2011)
Catching the bowl! Enantiopure RhI dimethylnorbornadiene fragments selectively catch interconverting enantiomers of C5-sym- pentasubstituted corannulene derivatives in one bowl form and allow the observation and isolation of enantiopure metal-buckybowl complexes. A quantum mechanical model (see picture) predicts the mechanism of molecular dynamics and degree of stereoselective recognition.
A highly enantioselective catalyst for the asymmetric Nozaki-Hiyama-Kishi reaction of allylic and vinylic halides
Berkessel, Albrecht,Menche, Dirk,Sklorz, Christoph A.,Schroeder, Michael,Paterson, Ian
, p. 1032 - 1035 (2007/10/03)
Catalytic asymmetric addition of vinylic halides and trifiates to aldehydes, with useful levels of stereoinduction, has been achieved for the first time using the salentype ligand (S,S)-5 (see scheme; PMB=para-methoxybenzyl), which contains the novel endo
New Ligands with a Wide Bite Angle. Efficient Catalytic Activity in the Rh(I)-Catalyzed Hydroformylation of Olefins
Yamamoto, Keiji,Momose, Satoru,Funahashi, Masakazu,Ebata, Satoshi,Ohmura, Hideaki,et al.
, p. 189 - 192 (2007/10/02)
The relevance of a new diphosphinite, which holds a natural bite angle around 120 deg in a catalyst complex, to the Rh(I)-catalyzed hydroformylation of certain olefins is examined, exhibiting a high turnover frequency (TOF) as compared with a typical 1,2-bis(diphenylphosphino)ethane with a bite angle around 85 deg.
Tandem-Michael addition of 1-cyanoenamines to cyclohexenones. A new access to bicyclo[2.2.2]octanones
Ahlbrecht,Dietz,Schon,Baumann
, p. 133 - 140 (2007/10/02)
Bicyclo[2.2.2]octane-2,5-diones 5 are easily obtained via tandem Michael addition of 2-(N-methylanilino)acrylonitrile (2) with deprotonated cyclohexenones I. The reaction is highly anti-stereoselective with respect to substituents on C-4 and C-5 of the cyclohexenone and is blocked by disubstitution on C-4. 6-Acylbicyclo[2.2.2]octan-2-ones 25 are obtained by tandem Michael addition of deprotonated 2-(N-methylanilino)but-2-enonitrile (18) with cyclohexenone and subsequent protonation or alkylation. Both reactions gave lower yields or even failed with cyclopentenone and cycloheptenone.
NEW STRATEGY IN THE STEREOCONTROLLED SYNTHESIS OF THE SPIRO KETAL SUBUNIT OF MILBEMYCINS
Bac, Nguyen Van,Langlois, Yves
, p. 2819 - 2822 (2007/10/02)
A double Baeyer-Villiger oxidation of bicyclo heptane-2,5-dione and a stereocontrolled alkylation of the dianion derived from 4-pentyn-2-ol are the salient features of a new strategy in the stereocontrolled synthesis of the spiroketal moiety of milbemycins.