novel chiral Lewisbase catalysts were synthesized from L-serine and applied in the hydrosilylation of β-enamino esters, in which the optimal one promoted the reactions to afford a wide variety of β-amino esters in good yields with good enantioselectivities. It is noteworthy that several cyclic substrates were hydrosilylated under the optimal conditions to give the cyclic β-amino esters with high yields
Use of α-Allyloxy-α-trimethylsiloxyacetate for Reductive Imino Aldol Reaction Promoted by Titanium Tetraiodide: A Rapid Access to β-Amino-α-hydroxy Esters
作者:Makoto Shimizu、Tetsuya Sahara
DOI:10.1246/cl.2002.888
日期:2002.9
Under the influence of titaniumtetraiodide the reductive imino aldol reaction of α-allyloxy-α-trimethylsiloxyacetate proceeded with imines to give β-amino-α-hydroxy esters in good yields.
A Strategy to Synthesize Taxol Side Chain and (−)-<i>epi</i> Cytoxazone via Chiral Brønsted Acid-Rh<sub>2</sub>(OAc)<sub>4</sub> Co-catalyzed Enantioselective Three-Component Reactions
作者:Yu Qian、Xinfang Xu、Liqin Jiang、Dipak Prajapati、Wenhao Hu
DOI:10.1021/jo101559p
日期:2010.11.5
A new approach to synthesize optically active β-amino-α-hydroxyl acid derivatives via chiral Brønsted acid-Rh2(OAc)4 cocatalyzed three-component reactions of diazo acetates with alcohols and imines is reported. A matched reaction system was identified to give the products in moderate diastereoselectivity and good enantioselectivity. Application of this methodology is demonstrated in the efficient synthesis
Synthesis of 1,3-oxazolidines by copper-catalyzed addition of acetone and ethyl diazoacetate to imines
作者:Seung-Han Lee、Jin Yang、Tae-Dong Han
DOI:10.1016/s0040-4039(01)00479-8
日期:2001.5
1,3-Oxazolidines are obtained in high yields by copper-catalyzed addition of ethyldiazoacetate to imines in the presence of acetone. Hydrolysis of the oxazolidines with 6N HCl yields 1,2-amino alcohols.
Component match in rhodium catalyzed three-component reactions of ethyl diazoacetate, H2O and aryl imines: a highly diastereoselective one-step synthesis of β-aryl isoserine derivatives
作者:Zhenqiu Guo、Taoda Shi、Jun Jiang、Liping Yang、Wenhao Hu
DOI:10.1039/b915013g
日期:——
Water and ethyl diazoacetate were found to be matched components for generating highly reactive nucleophilic oxonium ylide in the presence of a dirhodium acetate catalyst. Simultaneous trapping of the oxonium ylide intermediate with aryl imines gave β-aryl isoserine derivatives with high diastereoselectivity.