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.
The Mannich-typereaction of silylenolates with aldimines occurred smoothly with [emim]OTf as a solvent and without the addition of an activator to afford p-amino carbonyl compounds in excellent yields.
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.
Sulfated zirconia (SO4/ZrO2) as a reusable solid acid catalyst for the Mannich-type reaction between ketene silyl acetals and aldimines
作者:Sainan Wang、Shuichi Matsumura、Kazunobu Toshima
DOI:10.1016/j.tetlet.2007.07.072
日期:2007.9
Sulfated zirconia (SO4/ZrO2) catalyzed Mannich-type reactions of ketene silyl acetals and aldimines proceeded smoothly at room temperature to afford -amino esters in good to high yields. in addition, the heterogeneous solid acid catalyst SO4/ZrO2 was easily recovered from the reaction mixture and then reused without significant loss of effectiveness. (c) 2007 Elsevier Ltd. All rights reserved.