Abstract: Novel p-alkoxyphenylthionophosphine sulfide dimers useful for preparing thiopeptides from peptides.

Abstract: There is described the stereoselective total synthesis by a variety of routes of novel suitably substituted .DELTA..sup.2,3 -1,4-morpholine-2-carboxylic acids possessing a fused .beta.-lactam ring in the 1,6-position and carrying a substituent cis to carbon 5 in the 7-position of the fused ring system represented by the general formula ##STR1## wherein Z is hydrogen or the residue of an ester group and X is acylamino. Also included in the invention are compounds of the above formula in which the carboxyl group at the 2-position is protected as by an easily cleavable ester group and salts of both the free acids and carboxyl-protected compounds. The compounds are potent antibacterial agents.

Abstract: There is described the stereoselective total synthesis by a variety of routes of novel suitably substituted .DELTA..sup.2,3 -1,4-morpholine-2-carboxylic acids possessing a fused .beta.-lactam ring in the 1,6-position and carrying a substituent cis to carbon 5 in the 7-position of the fused ring system represented by the general formula ##STR1## wherein Q is hydrogen, alkyl, aralkyl or --CH.sub.2 COOZ where Z is hydrogen or the residue of an ester group and X is amino, azido or acylamino. Also included in the invention are compounds of the above formula in which the carboxyl group at the 2-position is protected as by an easily cleavable ester group and salts of both the free acids and carboxyl-protected compounds. Those compounds in which X is acylamino and their physiologically hydrolyzed esters and pharmaceutically acceptable salts are potent antibacterial agents.

Abstract: The dextrorotatory and levorotatory isomers of 1,6-Carbamate-3N-carbethoxy-2,5-dideoxystreptamine (I) have been found to be very valuable intermediates useful in the preparation of totally synthetic aminoglycoside antibiotics. An example of such an aminoglycoside antibiotic is 5-deoxykanamycin A.

Abstract: There is described the stereoselective total synthesis by a variety of routes of novel suitably substituted .DELTA..sup.2,3 -1, 4-morpholine-2-carboxylic acids possessing a fused .alpha.-lactam ring in the 1,6-position and carrying a substituent cis to carbon 5 in the 7-position of the fused ring system represented by the general formula ##STR1## wherein Q is hydrogen, alkyl, aralkyl or -CH.sub.2 COOZ where Z is hydrogen or the residue of an ester group and X is amino, azido or acylamino. Also included in the invention are compounds of the above formula in which the carboxyl group at the 2-position is protected as by an easily cleavable ester group and salts of both the free acids and carboxyl-protected compounds. Those compounds in which X is acylamino and their physiologically hydrolyzed esters and pharmaceutically acceptable salts are potent antibacterial agents.

Abstract: There is described the stereoselective total synthesis by a variety of routes of novel suitably substituted .DELTA..sup.2,3 -1, 4-morpholine-2-carboxylic acids possessing a fused .beta.-lactam ring in the 1,6-position and carrying a substituent cis to carbon 5 in the 7-position of the fused ring system represented by the general formula ##STR1## wherein Q is hydrogen, alkyl, aralkyl or --CH.sub.2 COOZ where Z is hydrogen or the residue of an ester group and X is amino, azido or acylamino. Also included in the invention are compounds of the above formula in which the carboxyl group at the 2-position is protected as by an easily cleavable ester group and salts of both the free acids and carboxyl-protected compounds. Those compounds in which X is acylamino and their physiologically hydrolyzed esters and pharmaceutically acceptable salts are potent antibacterial agents.

Abstract: There is described novel substituted .DELTA..sup.2,3 -1, 4-morpholine-2-carboxylic acids possessing a fused .beta.-lactam ring in the 1,6-position and carrying a substituent cis to carbon 5 in the 7-position of the fused ring system represented by the general formula ##STR1## wherein Q is hydrogen or alkyl and X is amino. Also included in the invention are compounds of the above formula in which the carboxyl group at the 2-position is protected as by an easily cleavable ester group and salts of both the free acids and carboxyl-protected compounds. The compounds and their physiologically hydrolyzed esters and pharmaceutically acceptable salts are useful as intermediates in the preparation of antibacterial agents.