657396-96-8

Upstream product

• 542-92-7 cyclopenta-1,3-diene 
• 24424-99-5 di-tert-butyl dicarbonate 
• 36016-38-3 tert-Butyl N-hydroxycarbamate 
• 99027-90-4 2-oxa-3-azabicyclo[2.2.1]hept-5-ene-3-carboxylic acidtert-butyl ester 

Downstream Products

• 189625-12-5 (+)-(1S,4R)-1-hydroxy-4-[(tert-butoxycarbonyl)amino]-2-cyclopentene 
• 189625-14-7 (2S,4R)-acetic acid 4-tert-butoxycarbonylaminocyclopent-2-enyl ester 
• 201054-55-9 (+)-(1R,4S)-1-hydroxy-4-[(tert-butoxycarbonyl)amino]-2-cyclopentene 
• 657397-03-0 (2R,4S)-acetic acid 4-tert-butoxycarbonylaminocyclopent-2-enyl ester 
• 657396-97-9 (4-oxocyclopent-2-enyl)-carbamic acid tert-butyl ester 

Relevant academic research and scientific papers

Synthesis of 4-azacyclopent-2-enones and 5,5-dialkyl-4-azacyclopent-2- enones

Three different methods are reported for the preparation of 4-azacyclo-2-enones 1, two of which allow the preparation of the compounds in optically active form. In addition, a facile route to 4-aza-5,5- dimethylcyclopent-2-enones 2 is disclosed.

IMPROVEMENTS IN PHARMACEUTICALLY USEFUL COMPOUNDS

A compound of formula (I) or (II): wherein A is hydrogen or CR1R2; Y and Z are each, independently, hydrogen or a halogen;X is -NR4R5, or R7; R1 is hydrogen, or a substituted or unsubstituted alkyl or alkenyl group containing 1-4 carbon atoms; when X is -NR4R5, R2 is a substituted or unsubstituted alkyl, alkenyl, alkynyl, aryl, aralkyl aralkenyl, or aralkynyl group, that optionally includes at least one heteroatom in its carbon skeleton and contains 1-12 carbon atoms; when X is R7, R2 is an unsubstituted alkyl, alkenyl or alkynyl group, or a substituted or unsubstituted aryl, aralkyl aralkenyl, or aralkynyl group, that optionally includes at least one heteroatom in its carbon skeleton and contains 1-12 carbon atoms; R3 is a substituted or unsubstituted alkyl, alkenyl, alkynyl, aryl, aralkyl aralkenyl, or aralkynyl group, that optionally includes at least one heteroatom in its carbon skeleton and contains 1-12 carbon atoms; R4 is hydrogen, a substituted or unsubstituted alkyl, alkenyl, alkynyl, aryl, aralkyl aralkenyl, or aralkynyl group, that optionally includes at least one heteroatom in its carbon skeleton and contains 1-12 carbon atoms, -COOR8, or -COR8; R5 is hydrogen, or a substituted or unsubstituted alkyl or alkenyl group containing 1-5 carbon atoms; R7 is an unsubstituted alkyl, alkenyl, or alkynyl group, that contains 1-4 carbon atoms; and, R8 is an unsubstituted or halo-substituted alkyl, aryl, or aralkyl group, that contains 1-12 carbon atoms.