The invention relates to a process for obtaining cis-4-hydroxy-6-methyl-5,6-dihydro-4H-thieno[2,3-b]thiopyran-7,7-dioxide, its enantiomers or mixtures thereof, by reduction of 5,6-dihydro-6-methyl-4H-thieno[2,3-b]thiopyran-4-one-7,7-dioxide with a reducing agent which generates hydride ions. The obtained compounds are useful as intermediates in the synthesis of chiral active ingredients.
该发明涉及一种通过用产生
氢化物离子的还原剂还原5,6-二氢-6-甲基-4H-
噻吩[2,3-b]
噻吩吡喃-4-酮-7,7-二氧化物,从而获得顺式-
4-羟基-6-甲基-5,6-二氢-4H-
噻吩[2,3-b]
噻吩吡喃-7,7-二氧化物,其对映体或其混合物的过程。所得化合物在手性活性成分合成中作为中间体有用。