Iron-Catalyzed Reductive Ethylation of Imines with Ethanol
作者:Marie Vayer、Sara P. Morcillo、Jennifer Dupont、Vincent Gandon、Christophe Bour
DOI:10.1002/anie.201800328
日期:2018.3.12
complex as precatalyst. This approach opens new perspectives in this area as it enables the synthesis of unsymmetric tertiary amines from readily available substrates and ethanol as a C2 building block. A variety of imines bearing electron‐rich aryl or alkyl groups at the nitrogen atom could be efficiently reductively alkylated without the need for molecular hydrogen. The mechanism of this reaction, which
Diastereoselective Synthesis of and Mechanistic Understanding for the Formation of 2‐Piperidinones from Imines and Cyano‐Substituted Anhydrides
作者:Michael J. Di Maso、Kevin M. Snyder、Fábio De Souza Fernandes、Ommidala Pattawong、Darlene Q. Tan、James C. Fettinger、Paul Ha‐Yeon Cheong、Jared T. Shaw
DOI:10.1002/chem.201504424
日期:2016.3.24
2‐Piperidinones are synthesized in a single step from imines and 2‐cyano glutaric anhydrides. The reaction provides the products in good diastereoselectivity and generates a quaternary stereogenic center. Substitutions on the anhydride skeleton are well tolerated to provide 2‐piperidinones with three stereogenic centers from a single transformation. The pertinent transition structures have also been
Enantioselective Generation of Adjacent Stereocenters in a Copper‐Catalyzed Three‐Component Coupling of Imines, Allenes, and Diboranes
作者:Kay Yeung、Rebecca E. Ruscoe、James Rae、Alexander P. Pulis、David J. Procter
DOI:10.1002/anie.201606710
日期:2016.9.19
enantio‐ and diastereoselective copper‐catalyzed three‐component coupling affords the first general synthesis of homoallylicamines bearing adjacent stereocenters from achiral starting materials. The method utilizes a commercially available NHC ligand and copper source, operates at ambient temperature, couples readily available simple imines, allenes, and diboranes, and yields high‐value homoallylic amines
2-hydroxybenzaldehyde showing strong intramolecular hydrogen bonding are studied on the basis of solution 13 C NMR spectroscopic data and semiempirical MO (AM1) calculations of the relative stability of tautomers. Excited state protontransfer is also investigated using electronic absorption and fluorescence spectroscopies, and calculation of vertical excitation energies (INDO/S). The theoretical predictions
摘要 基于溶液 13 C NMR 光谱数据和互变异构体相对稳定性的半经验 MO (AM1) 计算,研究了显示强分子内氢键的 2-羟基苯甲醛的单取代和双取代苯胺中的取代基效应。还使用电子吸收和荧光光谱以及垂直激发能 (INDO/S) 的计算来研究激发态质子转移。理论预测与实验观察一致。