作者:Nicolas Delpont、Imma Escofet、Patricia Pérez-Galán、Dirk Spiegl、Mihai Raducan、Christophe Bour、Riccardo Sinisi、Antonio M. Echavarren
DOI:10.1039/c3cy00250k
日期:——
Chiral gold(I) phosphite complexes are readily prepared modularly from 3,3′-bis(triphenylsilyl)-1,1′-bi-2-naphthol. These chiral gold(I) phosphite complexes are very reactive precatalysts for the [4+2] cycloaddition of aryl-substituted 1,6-enynes with enantiomeric ratios ranging from 86 : 14 up to 94 : 6.
Brønsted Acid-Catalyzed, Highly Enantioselective Addition of Enamides to In Situ<i>-</i>Generated<i>ortho</i>-Quinone Methides: A Domino Approach to Complex Acetamidotetrahydroxanthenes
作者:Satyajit Saha、Christoph Schneider
DOI:10.1002/chem.201406044
日期:2015.2.2
The highly enantioselective conjugate addition of enamides and enecarbamates to in situ‐generated ortho‐quinone methides, upon subsequent N,O‐acetalization, gives rise to acetamido‐substituted tetrahydroxanthenes with generally excellent enantio‐ and diastereoselectivities. A chiral BINOL‐based phosphoric acid catalyst controls the enantioselectivity of the carbon–carbon bond‐forming event. The products
Polymerization of<b><i>t</i></b>-Butyl Vinyl Ether Mediated by an Aluminum Lewis Acid–TrF System and Its Complex Structure–Tacticity Correlation
作者:Masataka Oishi、Hisashi Yamamoto
DOI:10.1246/bcsj.74.1445
日期:2001.8
A variety of aluminum (aryloxide)s were used with triphenylmethyl fluoride (TrF) initiator for the isoselective cationic polymerization of t-butyl vinyl ether. This contribution discusses the relationship between polymer tacticity and counteranion structure, which changed according to the bulkiness, strength and chirality of the Lewis acid combined with TrF so as to make the ionic pair more interactive
Chiroptical Switching Polyguanidine Synthesized by Helix-Sense-Selective Polymerization Using [(<i>R</i>)-3,3‘-Dibromo-2,2‘-binaphthoxy](di-<i>tert</i>-butoxy)titanium(IV) Catalyst
作者:Hong-Zhi Tang、Paul D. Boyle、Bruce M. Novak
DOI:10.1021/ja0453533
日期:2005.2.1
A series of chiral binaphthyl titaniumalkoxidecomplexes were synthesized. Among them, chiral titaniumcomplex [(R)-3,3'-dibromo-2,2'-binaphthoxy](di-tert-butoxy)titanium(IV) (R-3) exists as a crystallographic C2 dimer in the solid state but a monomer in solution at room temperature. Application of R-3 in the helix-sense-selective polymerization of achiral carbodiimide, N-(1-anthryl)-N'-octadecylcarbodiimide
3,3‘-Bis(trisarylsilyl)-Substituted Binaphtholate Rare Earth Metal Catalysts for Asymmetric Hydroamination
作者:Denis V. Gribkov、Kai C. Hultzsch、Frank Hampel
DOI:10.1021/ja058287t
日期:2006.3.1
Chiral 3,3'-bis(trisarylsilyl)-substituted binaphtholate rare earth metal complexes (R)-[LnBinol-SiAr3}(o-C6H4CH2NMe2)(Me2NCH2Ph)] (Ln = Sc, Lu, Y; Binol-SiAr3 = 3,3'-bis(trisarylsilyl)-2,2'-dihydroxy-1,1'-binaphthyl; Ar = Ph (2-Ln), 3,5-xylyl (3-Ln)) and (R)-[LaBinol-Si(3,5-xylyl)3}E(SiMe3)2}(THF)2] (E = CH (4a), N (4b)) are accessible via facile arene, alkane, and amine elimination. They are efficient