| 摘要 |
<p>The present invention relates to a process for the preparation of a compound of formula
wherein R 1 is selected from C 1-6 -alkyl, C 3-6 -cycloalkyl and aralkyl, and
wherein R 2 at each occurrence independently is halogen or C 1-6 -alkyl, and m is an integer from 0 to 4, Q is selected from halogen, -NO 2 and -NR 3 R 4 , wherein R 3 and R 4 are independently selected from hydrogen, C 1-6 -alkyl, C 1-6 -cycloalkyl, aryl, aralkyl, mesyl and tosyl, or wherein R 3 and R 4 together form a C 4-6 -alkylene group, Y at each occurrence is hydrogen or a hydroxy protection group W that can be hydrolytically cleaved under acidic conditions, and n is an integer from 1 to 3, and n is an integer from 1 to 3, with the proviso that n and m together are not greater than 5.</p> |
