摘要:
This invention relates to a process for catalytically hydrogenating a hydrogenatable precursor in contact with a hydrogen-containing gas and a hydrogenation catalyst comprising one or more active hydrogenation catalyst components on a support comprising titanium dioxide in the rutile crystalline phase to produce 1,4-butanediol and, optionally, gamma-butyrolactone and/or tetrahydrofuran.
摘要:
Disclosed is a method for the hydrogenation of tetrahydroxybutane in the presence of supported rhenium catalysts and an acid to form tetrahydrofuran and its precursors.
摘要:
A method is provided for synthesizing diaryl-substituted heterocyclic compounds, particularly 2,5-diaryl-substituted tetrahydrofurans and tetrahydrothiophenes. Methods for synthesizing starting materials and intermediates are provided as well. An important application of the invention is in the synthesis of CMI-392, (null) trans-2-null5-(Nnull-methyl-Nnull-hydroxyureidyl-methyl)-3-methoxy-4-p-chlorophenylthioethoxyphenylnull-5-(3,4,5-trimethoxyphenyl)-tetrahydrofuran, a highly effective agent in treating inflammatory and immune disorders. The invention also encompasses novel compounds useful as starting materials and intermediates in the synthetic processes disclosed.