| abstract |
The invention relates to a process for the preparation of compounds of the formula I. in which n = 1, 2 or 3, R is acyl and R¹ is alkyl, cycloalkyl, aralkyl or another carboxyl protecting group, which is characterized in that compounds of the formula II in which n, R and R 1 are as defined above and Hal is chlorine, bromine or iodine, free radical cyclization, intermediates of this process and their use. |