2-Naphthalenesulfonyl chloride → HCID 23002656, compound

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Reaction Steps

1.91 g of (1,2,3,4-tetrahydro-1-isoquinolyl)-acetic acid (Preparation 2.18) are suspended in 25 ml of dioxane, 10 ml of 1N NaOH are added, followed by portionwise addition of 2.3 g of 2-naphthalenesulphonyl chloride, and the mixture is maintained at pH=10.5-12 by addition of 1N NaOH. The mixture is kept stirring at a constant pH for 2 hours at RT. The reaction medium is diluted with 100 ml of water and is then washed twice with EtOAc and brought to pH=1.2 by addition of 6N HCl in the presence of EtOAc. This mixture is extracted with EtOAc, washed with saturated NaCl solution, dried over Na2SO4 and evaporated to dryness. The expected product crystallizes from heptane, and is drained, washed with heptane and then dried to give 3.14 g, m.p.=132° C.

Provenance & Evidence