5-(dipropylamino)-5-oxopentanoic acid

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Synthesis in analogy to the General Method 1 starting from (3aS,4R,7aS)-4-hydroxy-4-m-tolylethynyl-octahydro-indole-1-carboxylic acid methyl ester and 4-dipropylcarbamoyl-butyric acid to yield (3aR,4S,7aR)-methyl 4-(5-(dipropylamino)-5-oxopentanoyloxy)-4-(m-tolylethynyl)octahydro-1H-indole-1-carboxylate. MS [2M+H+NH4]=1039; RT=1.41 min; UPLC Method I

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Following the general procedure of EXAMPLEs 6 and making non-critical variations and using (2R,3S)-3-amino-4-(3,5-difluorophenyl)-1-[(3-methoxybenzyl)amino]-2-butanol (VIII, EXAMPLE 5) with 5-(dipropylamino)-5-oxopentanoic acid (DX), the title compound is obtained, MH+=534.2.