An Easy, Efficient, and Completely Stereoselective Synthesis of (E)-α,β-Unsaturated Esters via Sequential Aldol-Type/Elimination Reactions Promoted by Samarium Diiodide or Chromium Dichloride
CuH-Catalyzed Regioselective Intramolecular Hydroamination for the Synthesis of Alkyl-Substituted Chiral Aziridines
作者:Haoxuan Wang、Jeffrey C. Yang、Stephen L. Buchwald
DOI:10.1021/jacs.7b04816
日期:2017.6.28
This report details a general and enantioselective means for the synthesis of alkyl-substituted aziridines. This protocol offers a direct route for the synthesis of alkyl-substituted chiral aziridines from achiral starting materials. Readily accessed allylic hydroxylamine esters undergo copper hydride-catalyzed intramolecular hydroamination with a high degree of regio- and enantiocontrol to afford
Iron(III) and Ruthenium(II) Porphyrin Complex-Catalyzed Selective Olefination of Aldehydes with Ethyl Diazoacetate
作者:Ying Chen、Lingyu Huang、Meera A. Ranade、X. Peter Zhang
DOI:10.1021/jo0341158
日期:2003.5.1
The commercially available Fe(III) and Ru(II) porphyrin complexes Fe(TPP)Cl and Ru(TPP)(CO) are efficient catalysts for selective olefination of a variety of aldehydes with ethyldiazoacetate in the presence of triphenylphosphine. The reactions were carried out under mild conditions in a one-pot fashion with the use of a stoichiometrical amount of EDA, which proceeded with excellent yields and high
A New and Efficient Method for the Selective Olefination of Aldehydes with Ethyl Diazoacetate Catalyzed by an Iron(II) Porphyrin Complex
作者:Gholam A. Mirafzal、Guilong Cheng、L. Keith Woo
DOI:10.1021/ja016721v
日期:2002.1.1
Olefination of aromatic and aliphatic aldehydes with ethyldiazoacetate was achieved in excellent yields with triphenylphosphine and catalytic amounts of iron(II) meso-tetra(p-tolyl)porphyrin. The reaction conditions are mild and the process is efficient and highly selective (>90%) for the synthesis of the trans-olefin isomer. Results of mechanistic studies are discussed.
用三苯基膦和催化量的铁 (II) 内消旋四 (对甲苯基) 卟啉以极好的收率实现了芳香族和脂肪族醛与重氮乙酸乙酯的烯烃化反应。反应条件温和,该方法高效且选择性高(>90%),用于合成反式烯烃异构体。讨论了机理研究的结果。
A Practical, efficient, and atom economic alternative to the Wittig and Horner–Wadsworth–Emmons reactions for the synthesis of (E)-α,β-unsaturated esters from aldehydes
作者:Benjamin List、Arno Doehring、Maria T. Hechavarria Fonseca、Andreas Job、Ramon Rios Torres
DOI:10.1016/j.tet.2005.09.081
日期:2006.1
efficient new methodology for the synthesis of (E)-α,β-unsaturatedestersfromaldehydes. In our DMAP-catalyzed reaction, both aromatic as well as aliphatic aldehydes furnish the desired products highly regio- and stereoselectively if treated with commercially available or synthetically easily accessible malonic acid half ester. A large scale application in the synthesis of p-methoxycinnamates, which are
Practical Synthesis of (E)-α,β-Unsaturated Esters from Aldehydes
作者:Benjamin List、Arno Doehring、Maria T. Hechavarria Fonseca、Kathrin Wobser、Hendrik van Thienen、Ramon Rios Torres、Pedro Llamas Galilea
DOI:10.1002/adsc.200505196
日期:2005.10
Based on a modification of the Doebner–Knoevenagel reaction, a practical and highly efficient synthesis of α,β-unsaturated esters with excellent regio- and stereoselectivity was developed. The reactions are catalyzed by 4-dimethylaminopyridine in DMF at room temperature or below. Both aliphatic and aromatic aldehydes can readily be used in the process.