| abstract |
Compounds of the general Formula 2, ** (See formula) ** in which R1, R3 and R5 refer to hydrogen or a suitable hydroxy protecting group, particularly a benzoyl group, R2 and R4 respectively refer to hydrogen or alkyl with 1 to 6 atoms of C and R6 and R7 respectively refer to hydrogen or a suitable amino protecting group, and the wavy line refers respectively to the two possible configurations of -OR3 or -OR5 with reference to the basic body. |