... Tokyo, 140, Japan. Received 15 November 1984, Available online 9 March 2001. Abstract. Reaction of acetoxyazetidinones, and , with trimethylsilyl- acetyl thiolesters afforded azetidinone-thiolesters, and , which are useful intermediates in the carbapenem synthesis. References. 1; A. Yoshida, Y. Tajima, N. Takeda, S. Oida; Tetrahedron Lett., 25 (1984), p. 2793. ...