Relative reactivities of substituted olefins toward benzyne
作者:I. Tabushi、K. Okazaki、R. Oda
DOI:10.1016/s0040-4020(01)82980-x
日期:1969.1
In the reaction of various substituted olefins with benzyne, product determination and relativereactivity measurements were carried out. The principal reaction is the addition-H migration. Orientation of the first addition (concerning with the substituent on the double bond) and acceleration with acetyl, methoxycarbonyl, aluoxyl or alkyl substituent revealed that a biradical intermediate is involved
Allenic Esters from Cyclopropenones by Lewis Base Catalysis: Substrate Scope, the Asymmetric Variant from the Dynamic Kinetic Asymmetric Transformation, and Mechanistic Studies
作者:Yin Wei、Wen-Tao Zhao、Yuan-Liang Yang、Zhen Zhang、Min Shi
DOI:10.1002/cctc.201500466
日期:2015.10
corresponding asymmetric reaction in the presence of multifunctional chiral phosphine catalyst. The reaction mechanism was disclosed by using NMR tracing experiments, MS, and DFT calculations. Notably, the asymmetric reaction was proved to be a dynamickineticasymmetrictransformationbased on the control experiments, and the detailed mechanism of this transformation revealed by theoretical investigations
The metal-free cyclization of allenylketones and p-toluenesulfonylmethyl isocyanide (TosMIC), promoted by Cs2CO3, provides a convenient access to tetrasubstituted pyrroles in which an acyl group undergoes 1,2-migration. This tandem Michael addition/annulative migration synthetic strategy is general and high-yielding for various substituted allenylketones. Moreover, a phosphoryl or ester moiety is
由 Cs 2 CO 3促进的联烯基酮和对甲苯磺酰甲基异氰化物 (TosMIC)的无金属环化提供了获得四取代吡咯的便捷途径,其中酰基经历 1,2-迁移。这种串联迈克尔加成/环状迁移合成策略对各种取代的丙二烯酮具有通用性和高产率。此外,磷酰基或酯部分也是使这种迁移成为可能的合适功能。
Nader, Franz W.; Brecht, Angelika; Kreisz, Siegfried, Chemische Berichte, 1986, vol. 119, # 4, p. 1196 - 1207
作者:Nader, Franz W.、Brecht, Angelika、Kreisz, Siegfried
DOI:——
日期:——
NADER, F. W.;WACKER, C. -D., ANGEW. CHEM., 1985, 97, N 10, 876-877