Two Novel Diastereoselective Three-Component Reactions of Alkenes or 3,4-Dihydro-(2<i>H</i>)-pyran with Urea/Thiourea−Aldehyde Mixtures: [4 + 2] Cycloaddition vs Biginelli-Type Reaction
Two novel diastereoselective three-component reactions of alkenes or 3,4-dihydro-(2H)-pyran with urea/thiourea-aldehyde mixtures are described. [reaction: see text]
Antimony trichloride catalyzed three-component reaction of urea, aldehydes and cyclic enol ethers: a novel route to 4-arylhexahydrofuro[2,3-d]pyrimidin-2(3H)-ones
作者:R.N. Bhattacharya、Pradip Kundu、Gourhari Maiti
DOI:10.1016/j.tetlet.2010.10.064
日期:2011.1
Antimony trichloride efficiently catalyses diastereoselective three-component reaction of urea, aromatic aldehydes and 2,3-dihydrofuran or 3,4-dihydro-2H-pyran leading to 4-arylhexahydrofuro[2,3-d]pyrimidin-2(3H)-ones and 4-arylhexahydro-1H-pyrano[2,3-d]pyrimidin-2(8aH)-ones, respectively in good yield. (C) 2010 Elsevier Ltd. All rights reserved.