Patent ID: 8703976

Claim:
A compound of formula II, wherein R 1 is halogen, preferably chlorine or bromine, alkanoyloxy, preferably acetoxy or formyloxy or trifluoroacetoxy, FSO 2 O—, alkane-sulfonyloxy, arylalkane-sufonyloxy, arene-sulfonyloxy, arene-sulfonyloxy, preferably CH 3 SO 2 O— or Tosyloxy or CF 3 SO 2 O—, and R 2 is —NO 2 or —N 3 , or halogen, preferably chlorine, bromine, or hydroxy or lower alkoxy or lower alkanoyloxy or alkane-sulfonyloxy-, preferably CH 3 SO 2 O—, CF 3 SO 2 O—, or —NHR 8 , wherein R 8 is hydrogen, alkyl, aryl, alkylaryl, arylalkyl, preferably benzyl, mono-, di- or tri-methoxybenzyl, —C(O)alkyl, —C(O)aryl, —C(O)alkylaryl, —C(O)arylalkyl, —C(O)Oalkyl, —C(O)Oaryl, —(O)COalkylaryl, —C(O)Oarylalkyl, preferably formyl, acetyl, trifluoroacetyl, —C(O)Obenzyl (Cbz), —C(O)Otert.-butyl (BOC), and R 5 is either void, when the dotted lines are a double bond representing carbonyl, or R 5 is hydrogen, lower alkyl, preferably methyl, alkanoyl, preferably formyl or acetyl or trifluoroacetyl or —C(O)—OMe, when the dotted lines are one single bond representing sec.-alcohol, and a salt thereof.