The enereaction of N-Phenyl-1,2,4-triazoline-3,5-dione with alkenes shows a remarkable preference for hydrogen abstraction from the group which is geminal to the larger substituent of the double bond. These results require that the dominant effect in the transition state of the enereaction is the nonbonded interactions.
Highly Enantioselective Alkenylation of Glyoxylate with Vinylsilane Catalyzed by Chiral Dicationic Palladium(II) Complexes
作者:Kohsuke Aikawa、Yu̅ta Hioki、Koichi Mikami
DOI:10.1021/ja906164p
日期:2009.10.7
Chiral dicationic palladium complex-catalyzed vinylation and dienylation of glyoxylate with vinylsilanes and dienylsilanes to produce highly optical active allylic alcohols has been achieved. The advantages of this reaction are that the chiralpalladium catalyst is readily employed and that vinylsilanes as nucleophiles are easily synthesized, storable, and air- and moisture-stable.
BUECHI G.; WUEEST H., J. AMER. CHEM. SOC., 1978, 100, NO 1, 294-295
作者:BUECHI G.、 WUEEST H.
DOI:——
日期:——
Enantioselective Scandium-Catalyzed Vinylsilane Additions: A New Approach to the Synthesis of Enantiopure β,γ-Unsaturated α-Hydroxy Acid Derivatives
作者:David A. Evans、Yimon Aye
DOI:10.1021/ja063878k
日期:2006.8.1
The development of the Lewis acid-catalyzed alkenylation using trimethylvinylsilanes is described. Both aliphatic and aromatic vinylsilanes were effective nucleophiles at room temperature affording chiral allylic alcohol products in excellent enantioselectivities (97 → 99% ee) and in moderate to good yields (45−99%). Complete retention of vinysilane geometry was observed where applicable.
On the origin of geminal regioselectivity in the ene reaction of singlet oxygen with substituted alkenes
作者:Waldemar Adam、Markus J. Richter
DOI:10.1016/s0040-4039(00)61349-7
日期:1993.1
The geminal regioselectivity observed in the ene reaction between singletoxygen and alkenes with anion-stabilizing groups is rationalized on the basis of a perepoxide intermediate, in which in analogy to the nucleophilic attack on protonated epoxides, the perepoxide is opened preferentially at the CO bond weakened by the substituent.