专利号:WO-2005090356-A1 优先权日:2004-03-15 标 题 :1,3 DIHYDROFURO [3,4-c]PYRIDINES AND THEIR PREPARATION 发明人:BONRATH WERNER; HELLER BARBARA 权利人:DSM IP ASSETS BV; BONRATH WERNER; HELLER BARBARA 摘要:The present invention relates to novel 1,3-dihydrofuro[3,4-c]pyridines which are useful intermediates in the synthesis of pyridoxines and a method for their preparation by cobalt(I) complex-catalysed [2 + 2 + 2]-cycloaddition of di-[(3-dimethyl-C1-4-alkoxysilyl)Â2-propynyl)] ethers with acetonitrile.
参考标题:An Improved Synthesis Of Pyridoxine Via [2+2+2] Cyclization Of Acetylenes And Nitriles 作者:Barbara Heller,Andrey Gutnov,Vladimir Abaev,Dmitry Redkin,Christine Fischer,Werner Bonrath 摘要:An Improved Synthesis Of Pyridoxine (Vitamin B6) Is Reported. The Key Step Involves The Light-Promoted [2+2+2] Cyclization Of 3,3-Bissilyl-Di-2-Propynyl Ethers And Acetonitrile In The Presence Of [cpco(Cod)] (1 Mol%) As A Catalyst. Convenient Oxidation And Iodination Procedures Are Elaborated To Transfer 3-SilylPyridines Into Corresponding 3-Hydroxy- And 3-Iodo-Derivatives.
合成参考文献
摘要:Kleemann, A.; Engel, J.; Kutscher, B.; Reichert, D., Pharmaceutical Substances[Online], Thieme: Stuttgart, (2003). 摘要:Spitzner, D., Science of Synthesis, (2005) 15, 111.