The total synthesis of ritipenems. Construction of penem thiazoline ring by incorporation of two 2C units of glycolic acid.
摘要:
Short syntheses of Ritipenem Acoxyl 1a and Ritipenem 1b are reported. The syntheses start from (R)-4-acetoxy-(S)-3-[(R)-1-(t-butyldimethylsilyloxy)ethyl]azetidin-2-one 3 and are based on the incorporation of two 2C units obtained by manipulation of glicolyc acid 4.
The use of triethyl phosphite and the appropriate carboxylic anhydridewas found to constitute an efficient method for the conversion of azetidinyl benzthiazolyl disulphides into acylthioazetidinones, allowing a short synthesis of penem FCE 88891 from its penam-1-oxide precursor.
Short syntheses of Ritipenem Acoxyl 1a and Ritipenem 1b are reported. The syntheses start from (R)-4-acetoxy-(S)-3-[(R)-1-(t-butyldimethylsilyloxy)ethyl]azetidin-2-one 3 and are based on the incorporation of two 2C units obtained by manipulation of glicolyc acid 4.