Compounds useful for producing an optically active diazabicyclooctane compound
An optically active (2S,5R)-7-oxo-1,6-diazabicyclo[3.2.1]octane-2-carboxylic acid compound defined by the following formula (F): wherein R 1 represents CO 2 R, CO 2 M, or CONH 2 , wherein R represents an allyl group or a benzyl group, and M represents a hydrogen atom, an inorganic cation, or an organic cation; and R 2 represents a benzyl group or an allyl group.
1. An optically active (2S,5R)-7-oxo-1,6-diazabicyclo[3.2.1]octane-2-carboxylic acid compound defined by the following formula (F):
wherein R 1 represents CO 2 M or CONH 2 ;
M represents an inorganic cation selected from the group consisting of sodium, potassium, lithium and calcium or an organic cation selected from the group consisting of trimethylamine, triethylamine, dicyclohexylamine, tetramethylammonium, tetraethylammonium, tetrabutylammonium and triethylbenzylammonium; and
R 2 represents a benzyl group or an allyl group.
2. A process for preparing the compound defined by the formula (F) according to claim 1 , which comprises subjecting a compound represented by formula (E) below to an intramolecular urea formation, and then subjecting the resultant compound represented by formula (F1) below to at least one of the steps (a) to (c) below:
wherein Bn represents a benzyl group, and tBu represents a tert-butyl group;
wherein Bn represents a benzyl group, and tBu represents a tert-butyl group;
step (a) for converting the compound of the formula (F1) to a form of a salt of an inorganic cation or an organic cation,
step (b) for treating the compound of the formula (F1) with an acid to convert the compound of the formula (F1) to a free acid, and then
performing a carbamoylation for the carboxylic acid group of the free acid,
step (c) for removing the benzyl group of the benzyloxy group at the 6-position, of the formula (F1) and then
converting the group at the 6-position to an allyloxy.
3. The compound according to claim 1 , wherein the compound is (2S,5R)-6-(benzyloxy)-7-oxo-1,6-diazabicyclo[3.2.1]octane-2-carboxamide.
4. The compound according to claim 1 , wherein R 1 is CO 2 M, and M is the inorganic cation.
5. The compound according to claim 1 , wherein R 1 is CO 2 M, and M is the organic cation.
6. The compound according to claim 1 , wherein R 1 is CONH 2 .
7. A process for preparing the compound defined by the following formula (F)
wherein R 1 represents CO 2 R, CO 2 M, or CONH 2 ,
wherein R represents an allyl group or a benzyl group, and
M represents a hydrogen atom, an inorganic cation, or an organic cation; and
R 2 represents a benzyl group or an allyl group,
the process comprising
subjecting a compound represented by formula (E) below to an intramolecular urea formation, and then subjecting the resultant compound represented by formula (F1) below to at least one of the steps (a) to (g) below:
wherein Bn represents a benzyl group, and tBu represents a tert-butyl group;
wherein Bn represents a benzyl group, and tBu represents a tert-butyl group;
step (a) for cleaving the ester group of the formula (F1),
step (b) for converting the compound of the formula (F1) to a form of a salt of an inorganic cation or an organic cation,
step (c) for treating the compound of the formula (F1) with an acid to convert the compound of the formula (F1) to a free acid,
step (d) for performing a carbamoylation for the carboxylic acid group of the formula (F1),
step (e) for converting the carboxylic acid group of the formula (F1) to an ester,
step (f) for removing the benzyl group of the benzyloxy group at the 6-position, of the formula (F1) and
step (g) for converting the group at the 6-position to an allyloxy.