Process for producing 3-methyltetrahydrofuran, and process for producing an intermediate thereof
申请人:Kuraray Co., LTD
公开号:US06239295B1
公开(公告)日:2001-05-29
A process for producing 3-methyltetrahydrofuran, and processes for producing 3-hydroxy-3-methyltetrahydrofuran and 3-methyldihydrofuran, which are intermediates thereof, are provided.
A process for preparing a substituted or unsubstituted dihydrofuran from a substituted or unsubstituted butadiene monoxide which comprises contacting the butadiene monoxide with a catalyst comprising a hydrogen halide selected from the group consisting of hydrogen iodide or bromide and a homogeneous transition metal compound in an organic solvent under conditions effective to convert the butadiene monoxide to the dihydrofuran and wherein said transition metal compound is effective to accelerate said conversion. Preferably the transition metal is iron, manganese, cobalt, molybdenum, vanadium, copper, or nickel.
Baird, Mark S.; Baxter, Anthony G. W.; Hoorfar, Alireza, Journal of the Chemical Society. Perkin transactions I, 1991, # 4, p. 2575 - 2582
作者:Baird, Mark S.、Baxter, Anthony G. W.、Hoorfar, Alireza、Jefferies, Ian
DOI:——
日期:——
General Preparation and Controlled Cyclization of Acyclic Terpenoids
作者:Jinchul Kuk、Beom Soo Kim、Heejung Jung、Seyoung Choi、Jung-Youl Park、Sangho Koo
DOI:10.1021/jo702303a
日期:2008.3.1
[GRAPHICS]A general preparation method of the all-(E)-polyprenols 12 has been developed from readily available geranyl sulfone by the chain-extension process utilizing the C-5 unit 5 and the chain-temination process utilizing the C5 unit 10 together with the chemoselective reductive desulfortylation. The polyprenols 12 were converted to compounds 3 containing two consecutive prenyl sulfone moieties at the tail end, which underwent the controlled electrophilic cyclization only at the carbon-carbon double bonds that were remote from the flat and rigid benzenesulfonyl groups.