HCID 86614816, compound → HCID 86614823, compound

Participants

Reaction Conditions

Reaction Steps

1-Benzyl-2,3-dimethyl-3-(4-sulphobutyl)-3H-indolium-5-sulphonate salt (2 g), 1-(5-carboxypentyl)-2,3-dimethyl-3-(4-sulphobutyl)-3H-indolium-5-sulphonate (2 g) and malonaldehyde bis-phenylimine (2 g) were dissolved in acetic acid: pyridine: acetic anhydride (4.5:4.5:1) (100 ml). The mixture was heated at 90° C. for 2 hours. The mixture went blue/green immediately. A small sample was diluted in water for UV measurement. UV/Vis is absorption spectroscopy observed a peak at 650 nm showing formation of Cy5. The reaction mixture was stored overnight at +2° C. The mixture was rotary evaporated to yield an oil. This was pumped under vacuum for several hours to ensure dryness. The sticky solid washed with acetonitrile (4×500 ml) to yield a dry powder that was filtered and washed with more acetonitrile. The solid was dried under vacuum. Yield: 3.05 g.

Provenance & Evidence