Process for the stereoselective synthesis of 3-substituted 2- sulfonylmethylpropionic acids, and intermediate products

摘要

Compounds of the formula I ##STR1## can be prepared in a multi- day process starting from the compounds of the formulae II and III P PR.sup.1 --SH, II ##STR2## where the substituents R.sup.1, R.sup. 2 and R.sup.3 have the meanings given.