Mannich-Type Reaction in Water in the Presence of a Surfactant
作者:Takahiko Akiyama、Junji Itoh、Kohei Fuchibe
DOI:10.1055/s-2006-950344
日期:2006.12
The effect of sodium dodecyl sulfate (SDS) loading in fluoroboric acid catalyzed Mannich-type reactions of ketene silyl acetals with aldimines was studied. The reaction proceeded smoothly in the presence of 1 mol% of SDS. Formation of small particles was observed by transmission electron microscopy.
Mannich-type Reaction Catalyzed by HBF<sub>4</sub>in Water: Effect of the Loading of Surfactant
作者:Takahiko Akiyama、Junji Itoh、Kohei Fuchibe
DOI:10.1055/s-2002-32978
日期:——
The HBF4 (0.1 equiv)-catalyzed Mannich-type reactions of ketene silyl acetals with aldimines proceeded smoothly in water in the coexistence of as low as 1 mol% of SDS. Furthermore, the Mannich-type reaction also took place in water in the absence of SDS by means of 0.3 equiv of HBF4 to afford the corresponding β-amino esters in high yields.
Montmorillonite K10 catalyzed Mannich-type reaction and hydrophosphonylation proceeded smoothly in water at room temperature to give β-amino esters and α-amino phosphonates, respectively, in good to high yields.
Group 4 Metal Triflates as Efficient Catalysts for Allylations of Imines with Allyltributylstannane and Mannich-Type Reactions of Imines with Silyl Enol Ethers
Catalytic allylation of imines with allyltributylstannane and catalytic Mannich-type reactions of imines with silyl enol ethers were successfully carried out in the presence of a group 4 metal triflate, such as Zr(OTf)4 or Hf(OTf)4, to afford the corresponding adducts in high yields.
Quinone-catalyzed oxidative deformylation: synthesis of imines from amino alcohols
作者:Xinyun Liu、Johnny H Phan、Benjamin J Haugeberg、Shrikant S Londhe、Michael D Clift
DOI:10.3762/bjoc.13.282
日期:——
A new method for imine synthesis by way of quinone-catalyzed oxidative deformylation of 1,2-amino alcohols is reported. A wide range of readily accessible amino alcohols and primary amines can be reacted to provide N-protected imine products. The methodology presented provides a novel organocatalytic approach for imine synthesis and demonstrates the synthetic versatility of quinone-catalyzed oxidative