N-Heterocyclic carbene-catalyzed [3+3] cyclocondensation of bromoenals with aldimines: highly enantioselective synthesis of dihydropyridinones
作者:Zhong-Hua Gao、Xiang-Yu Chen、Han-Ming Zhang、Song Ye
DOI:10.1039/c5cc04593b
日期:——
The N-heterocycliccarbene-catalyzed [3+3] cyclocondensation of bromoenals with aldimines was developed to give the corresponding dihydropyridinones in good yields with excellent enantioselectivies.
Gold(I)-Catalyzed Diastereo- and Enantioselective 1,3-Dipolar Cycloaddition and Mannich Reactions of Azlactones
作者:Asa D. Melhado、Giovanni W. Amarante、Z. Jane Wang、Marco Luparia、F. Dean Toste
DOI:10.1021/ja1095045
日期:2011.3.16
reactions with electron-deficient alkenes and N-sulfonyl aldimines to give products of 1,3-dipolar cycloaddition and Mannich addition reactions, respectively. Both of these reactions proceed with good to excellent diastereo- and enantioselectivityusing a single class of gold catalysts, namely C(2)-symmetric bis(phosphinegold(I) carboxylate) complexes. The development of the azlactone Mannich reaction to
Rhodium-Catalyzed Enantioselective Arylation of Aliphatic Imines
作者:Naoya Kato、Tomohiko Shirai、Yasunori Yamamoto
DOI:10.1002/chem.201601246
日期:2016.6.1
Chiral rhodium(I)‐catalyzed highly enantioselective arylation of aliphatic N‐sulfonyl aldimines with arylboronic acids has been developed. This transformation is achieved by the use of a rhodium/bis(phosphoramidite) catalyst to give enantiomerically enriched α‐branched amines (up to 99 % ee). In addition, this system enables efficient synthesis of (+)‐NPS R‐568 and Cinacalcet which are calcimimetic
Branch-Selective Reductive Coupling of 2-Vinyl Pyridines and Imines <i>via</i> Rhodium Catalyzed C−C Bond Forming Hydrogenation
作者:Venukrishnan Komanduri、Christopher D. Grant、Michael J. Krische
DOI:10.1021/ja805056g
日期:2008.9.24
Hydrogenation of 2-vinyl azines 1a-1e in the presence of N-arylsulfonyl imines 2a-2l at ambienttemperature and pressure employing cationic rhodium catalysts ligated by tri-2-furylphosphine results in regioselective reductive coupling to furnish branched products of imine addition 3a-3v, which embody modest to high levels of syn-diastereoselectivity. Catalytic coupling of 6-bromo-2-vinylpyridine 1a
A new method for preparation of 3,6-dihydro-2H-1,3-oxazines and explorations of their use in stereoselective synthesis of 1,3-amino alcohol derivatives
作者:John P. Cherkauskas、Andrew M. Klos、Robert M. Borzilleri、Joseph Sisko、Steven M. Weinreb、Masood Parvez
DOI:10.1016/0040-4020(95)01100-5
日期:1996.2
Condensation of β-hydroxy aldehydes with N-sulfonyl aldimines produces 3,6-dihydro-2H-1,3-oxazines in moderate to excellent yields. The process is stereoselective, with the C-2 and C-6 substituents having a trans relationship in these heterocycles. Some transformations of these oxazines as potential acyclic 1,3-amino alcohol synthons are described.
β-羟基醛与N-磺酰基醛亚胺的缩合以中等至优异的产率产生3,6-二氢-2 H -1,3-恶嗪。该方法是立体选择性的,在这些杂环中C-2和C-6取代基具有反式关系。描述了这些恶嗪作为潜在的无环1,3-氨基醇合成子的一些转化。