Synthesis of 2-Methyl-9-oxo-9<i>H</i>-furo[2,3-<i>c</i>]benzopyrans and 2-Methyl-3<i>H</i>,4<i>H</i>[1]benzopyrano[3,4-<i>b</i>]pyrrol-4-ones
作者:Raghu Ram、S. Krupadanam、G. Srimannarayana
DOI:10.1080/00397919808004294
日期:1998.7
A one-pot [Bmim]OH-mediated synthesis of 3-benzamidocoumarins
作者:Lal Dhar S. Yadav、Santosh Singh、Vijai K. Rai
DOI:10.1016/j.tetlet.2009.02.166
日期:2009.5
The first example of an ionic liquid-promoted one-pot synthesis of 3-benzamidocoumarins from salicylaldehydes and 2-pheny-1,3-oxazolan-5-one via Knoevenagel condensation-ring transformation cascades has been reported. No by-product formation, operational simplicity, ambient temperature and high yield (85-97%) are the salient features of the present synthetic protocol. After isolation of the product, the ionic liquid, [Bmim]OH can be easily recycled for further use without any loss of efficiency. (C) 2009 Elsevier Ltd. All rights reserved.
Rhodium‐Catalyzed Asymmetric Hydrogenation of 3‐Benzoylaminocoumarins for the Synthesis of Chiral 3‐Amino Dihydrocoumarins
An asymmetrichydrogenation of 3-benzoylaminocoumarins was achieved for the first time using our BridgePhos-Rh catalytic system, providing chiral 3-amino dihydrocoumarins in high yields (up to 98 %) and with excellent enantioselectivities (up to 99.7 % ee). The relationship between the enantioselectivities of the hydrogenations and the dihedral angles and the resulting π-π stacking effects of the BridgePhos-Rh