Dimethylamine → [4-(5-Dimethylamino-pent-1-ynyl)-phenyl]-methyl-carbamic acid tert-butyl ester

Participants

Reaction Steps

A solution of 1.84 g (5 mmol) of Methanesulfonic acid 5-[4-(tert-butoxycarbonyl-methyl-amino)-phenyl]-pent-4-ynyl ester in 20 ml DMA was treated with 8.93 ml (50 mmol) of (33% in ethanol, 5.6 M) dimethylamine and stirred at RT for 18 h. The reaction was treated again with 4.46 ml (2 mmol) (25 mmol) of (33% in ethanol, 5.6 M) dimethylamine and stirred at RT for further 6 h. The solution was concentrated and the residual oil was extracted with aqueous sat. NaHCO3/Et2O (3×). The organic phases were washed with aqueous 10% NaCl solution, dried (Na2SO4) and evaporated to yield 1.50 g (95%) of [4-(5-Dimethylamino-pent-1-ynyl)-phenyl]-methyl-carbamic acid tert-butyl ester, MS: 317 (MH+).

Provenance & Evidence