PROCESS FOR THE PREPARATION OF CHIRAL TERT-BUTYL 4-((1R,2S,5R)-6-(BENZYLOXY)-7-OXO-1,6-DIAZABICYCLO[3.2.1]OCTANE-2-CARBOXAMIDO)PIPERIDINE-1-CARBOXYLATE DERIVATIVES AND (2S,5R)-7-OXO-N-PIPERIDIN-4-YL-6-(SULFOXY)-1,6-DIAZABICYCLO[3.2.1]OCTANE-2-CARBOXAMIDE
申请人:MILLER Steven P.
公开号:US20160122350A1
公开(公告)日:2016-05-05
A process for the preparation of N-protected 6-(piperidin-4-ylcarbamoyl)piperidin-3-yl sulfonates of Formula (III): which comprises contacting a lactone of Formula (II): with an azacycloalkylamine of formula (II-Am): followed by contact with a sulfonyl halide of formula (II-Su): R
4
—SO
2
W (II-Su) in the presence of tertiary amine base, wherein P
G1
and P
G2
are amine protective groups; k, p and q are 0, 1, or 2, and W, R
2
, R
3
, R
4
, R
5
, R
6
, R
7
, R
8
, and R
9
are defined herein. Additional embodiments add a series of process steps leading to the synthesis of 7-oxo-1,6-diazabicyclo[3.2.1]octanes suitable for use as β-lactamase inhibitors.