The invention relates to a process for the preparation of 2-Oxabicyclo[3.3.0]octane derivatives of the general formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.5 represent organic radicals and R.sub.2 and R.sub.3 also may represent hydrogen and wherein R.sub.4 is an acyl group or an tri-organo-silyl group and to the compounds of formula I produced by the process of the invention which compounds are valuable intermediates for the preparation of pharmacologically active compounds. The process of the invention comprises reacting a compound of the formula ##STR2## wherein R.sub.14 is lower alkyl or phenyl with a compound of the formula ##STR3## wherein R.sub.15 is trimethylsilyl or lower alkanoyl in an inert solvent at temperatures from about -80.degree. C. to about +60.degree. C. in presence of one or more Lewis acids.
本发明涉及一种制备2-Oxabicyclo [3.3.0]
辛烷衍
生物的过程,其通式为##STR1##其中R.sub.1,R.sub.2,R.sub.3和R.sub.5代表有机基团,R.sub.2和R.sub.3也可以代表氢,R.sub.4是酰基或三有机基
硅基团,并且本发明所制备的式I化合物是制备药理活性化合物的有价值的中间体。本发明的过程包括在惰性溶剂中以温度从约-80℃到约+60℃的温度下,在一种或多种
路易斯酸的存在下,将式##STR2##其中R.sub.14是低级烷基或苯基的化合物与式##STR3##其中R.sub.15是三甲基
硅基或低级烷酰基反应。