Synthesis, Optical Resolution, and Configurational Assignment of Novel Axially Chiral Quateraryls
作者:Atul Goel、Fateh V. Singh、Vijay Kumar、Matthias Reichert、Tobias A. M. Gulder、Gerhard Bringmann
DOI:10.1021/jo071097b
日期:2007.9.1
the optical resolution of the respective atropo-enantiomers by HPLC on a chiral phase and the assignment of their absolute axial configurations succeeded by LC-CD coupling in combination with semiempirical CNDO/S and TDDFT CD calculations. This synthetic approach offersin a transition metal-free environmenthigh flexibility in the construction of quateraryls with the desired conformational freedom along
Synthesis of arylated highly congested indans using a domino sequence
作者:Ramendra Pratap、Brijesh Kumar、Vishnu Ji Ram
DOI:10.1016/j.tet.2007.07.050
日期:2007.10
an-3-carboxylates (9a–e) by cyclopentanone (2) has been delineated. The synthetic potential of 2-pyranone was explored further to generatemoleculardiversity using 6-aryl-4-sec-amino-2-oxo-2H-pyran-3-carbonitriles (7a–h), 5,6-diaryl-4-methylsulfanyl-2-oxo-2H-pyran-3-carbonitriles (5a,b) and methyl 5,6-diaryl-4-methylsulfanyl-2-oxo-2H-pyran-3-carboxylates (12a,b) as precursors for the ring transformation
A series of thieno[3,2-c]pyrans were designed and synthesized by l-proline catalyzed reaction which exhibits substituent dependent fluorescence.
一系列由L-脯氨酸催化反应设计和合成的噻吩[3,2-c]吡喃化合物,显示出取代基依赖的荧光性质。
A substituent-controlled general approach to access arylated pyran-2-ones and pyrano[3,4-c]pyran-1,8-diones
作者:Fateh V. Singh、Manish Dixit、Sumit Chaurasia、Resmi Raghunandan、Prakas R. Maulik、Atul Goel
DOI:10.1016/j.tetlet.2007.10.095
日期:2007.12
2H-Pyran-2-ones are useful precursors for the synthesis of various aromatic and heterocyclic compounds. In this Letter, we describe substituent-controlled direct access to functionalized 4-(2-oxo-1,2-diarylethyl)-5,6-diaryl-pyran-2-ones by stirring a mixture of 3-cyano-5,6-diaryl-2H-pyran-2-ones and functionalized deoxybenzoins through an unusual decyanation reaction. Under similar reaction conditions
2 H-吡喃-2-酮是用于合成各种芳族和杂环化合物的有用前体。在这封信中,我们描述了通过搅拌3-氰基-5,6的混合物,通过取代基控制的直接访问官能化的4-(2-氧代-1,2-二芳基乙基)-5,6-二芳基-吡喃-2-酮-二芳基-2 H-吡喃-2-酮和官能化的脱氧安息香素通过异常的脱氰反应。在相似的反应条件下,3-羰基甲氧基-5,6-二芳基-2 H-吡喃-2-酮与取代的苯乙酮或脱氧苯偶姻的反应导致吡喃并[3,4- c ]吡喃-1,8的合成-二酮具有极好的收率。
Highly convenient regioselective synthesis of functionalized arylated benzene from ketene-S,S-acetal under mild conditions at room temperature
作者:Vijay Kumar、Fateh V. Singh、Amrita Parihar、Atul Goel
DOI:10.1016/j.tetlet.2008.11.098
日期:2009.2
A general, highly efficient synthesis of arylated benzenes from simple stitching of alpha-oxo-ketene-S,S-acetals and functionalized deoxybenzoins via a 'lactone intermediate' is described. This procedure offers easy access to highly functionalized arylated benzenes containing sterically demanding groups in good to excellent yields. The advantage of the procedure lies in the fabrication of arylated benzenes with desired conformational flexibility along the molecular axis at room temperature and in a transition metal-free environment through easily accessible precursors. (C) 2008 Elsevier Ltd. All rights reserved.