Sodium Hydroxide → HCID 19360724, compound

Participants

Reaction Steps

The aforementioned free amino acylation affords 3-(4-nitrophenyl)-2-hydroxy-N-(trifluoroacetylglycylglycyl-2-aminoethyl)propionamide. The hydroxyl group of 3-(4-nitrophenyl)-2-hydroxy-N-(trifluoroacetylglycylglycyl-2-aminoethyl)propionamide is tosylated with TsCl in pyridine to give 3-(4-nitrophenyl)-2-(p-toluenesulfonyl)-oxy-N-(trifluoroacetylglycylglycyl-2-aminoethyl)-propionamide. The trifluoroacetylamide group of 3-(5-nitrophenyl)-2-(p-toluenesulfonyl)-oxy-N-(trifluoroacetylglycylglycyl-2-aminoethyl)propionamide is deprotonated with sodium hydride and cyclized to give 2-(4-nitrobenzyl)-3,8,11-trioxo-N-trifluoroacetyl-1,4,7,10-tetraazadodecane. The trifluoroacetyl group of 2-(4-nitrobenzyl)-3,8,11-trioxo-N-trifluoroacetyl-1,4,7,10-tetraazacyclododecane is cleaved with sodium hydroxide to afford a triamide product, 2-(4-nitrobenzyl)-3,8,11-trioxo-1,4,7,10-tetraazacyclododecane. The triamide is reduced with borane to give 2-(p-nitrophenyl)-1,4,7,10-tetraazacyclododecane. Conversion of this product to nitro-benzyl-DOTA is accomplished via the procedure discussed in the Rennet al. article referenced above or as discussed in subsections A and C set forth above.

Provenance & Evidence