An efficient Cs2CO3‐promoted synthesis of α‐amino ketones using hydrazines, aldehydes, and α‐haloketones as starting materials through a cascade condensation/nucleophilic substitution/NNbondcleavage route is developed. The carbonyl group plays a key role in this novel NNbondcleavage process.
通过级联缩合/亲核取代/ NN键裂解途径,以肼,醛和α-卤代酮为起始原料,开发了一种高效的Cs 2 CO 3促进的α-氨基酮合成方法。羰基在这种新颖的NN键裂解过程中起关键作用。
Rhodium(III)-Catalyzed Directed C–H Dienylation of Anilides with Allenes Leads to Highly Conjugated Systems
allenylation, allylation, and annulation reactions. The outcome is governed by both the reactivity of the allene and the formation and stability of the organometallic intermediate. An efficient Rh(III)-catalyzed, weakly coordinating group-directed dienylation of electronically unbiased allenes is developed using an N-acyl amino acid as a ligand. Further elaboration of the dienylated products to construct
The palladium-catalyzed formal hydroacylation of allenes employing acid chlorides and hydrosilanes has been achieved. The reactions proceed with commercially available Pd(OAc)(2) as a catalyst and HSi(iPr)(3) as a reducing reagent, giving the corresponding alpha,beta-unsaturated ketones regio- and stereoselectively.
Multicomponent Coupling Reactions of Two <i>N</i>-Tosyl Hydrazones and Elemental Sulfur: Selective Denitrogenation Pathway toward Unsymmetric 2,5-Disubstituted 1,3,4-Thiadiazoles
A copper-mediated, three-component reaction between two different N-Ts hydrazones and elemental sulfur was developed, leading to a series of unsymmetric 2,5-disubstituted 1,3,4-thiadiazoles in moderate yields with good functional group compatibility. This procedure features the employment of elemental sulfur and the selective denitrogenation between aryl and alkyl aldehyde N-tosyl hydrazones, allowing rapid access to unsymmetric 2,5-disubstituted 1,3,4-thiadiazoles frameworks with chemical diversity and complexity.
Pieper, Mathias; Teichert, Wolfgang; Meier, Herbert, Liebigs Annalen der Chemie, 1986, # 8, p. 1334 - 1343
作者:Pieper, Mathias、Teichert, Wolfgang、Meier, Herbert