1,1'-Carbonyldiimidazole → Ethyl 2-(7-bromo-1'-((1-hydroxy-4-adamantyl)carbamoyl)-2,3-dihydrospiro[indene-1,4'-piperidine]-3-yl)acetate

Participants

Reaction Steps

A solution of 4-aminoadamantan-1-ol (628 mg, 3.76 mmol) in dry CH2Cl2 (2 mL) was added CDI (736 mg, 4.52 mmol) and DIEA (3.24 g, 25.12 mmol) at 0° C. under N2 and the mixture was stirred for 1 h. Ethyl 2-(7-bromo-2,3-dihydrospiro[indene-1,4′-piperidine]-3-yl)acetate (1.10 g, 3.14 mmol) was added and the mixture was stirred overnight. The mixture was washed with 5% aq HCl, and the organic layer was concentrated to give the crude product. Purification by preparative TLC followed by preparative HPLC gave two isomers of ethyl 2-(7-bromo-1′-((1-hydroxy-4-adamantyl)carbamoyl)-2,3-dihydrospiro[indene-1,4′-piperidine]-3-yl)acetate.

Provenance & Evidence