4-acetoxyazetidin-2-one (4-AA , 4-ABA or 4-AOSA)

(3R,4R)-4-acetoxy-3-[(1R)-1-t-butyldimethylsilyloxyethyl]azetidin-2-one. or
[3R-[3α(R*),4β] ]-4-(acetyloxy)-3-[1-[[(1,1-dimethylethyl)dimethlsilyl]oxy]
ethyl]azetidin-2-one.
Structural Formula:

Molecular Formula：C₁₃H₂₅NO₄Si
MW：287.43
CAS：[76855-69-1]
Optical Purity：99% e e
Assay：≥98.5%
[α]D²⁵: +46～+49°(c=0.98 CHCl₃)
Mp：104～108℃
Containing Water：≤0.2%

Intermediate of Meropenem.