Triethylamine → 2,10-dimethyl-6-(1,2,2,6,6-pentamethylpiperidin-4-ylamino)-4,8-di-tert-butyl-12H-dibenzo-[d,g][1,3,2]dioxaphosphocine

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Reaction Steps

10.12 g (25.0 mmol) of 2,10-dimethyl-4,8-di-tert-butyl-6-chloro-12H-dibenzo[d,g][1,3,2]-dioxaphosphocine [GB-A-2 250 990, Example 1a, page 17], 10.5 ml (75.0 mmol) of triethylamine and 100 ml of toluene are charged at room temperature and under nitrogen to a 350 ml sulfonation flask. With stirring, a solution of 4.26 g (25.0 mmol) of 4-amino-1,2,2,6,6-pentamethylpiperidine [Beilstein EII, Vol. 22, page 321 (1953)] in 30 ml of toluene is added dropwise to this suspension. The reaction mixture is refiuxed for 2 hours, then cooled to room temperature and filtered. The filtrate is concentrated on a vacuum rotary evaporator. Crystallisation of the residue from hexane yields 7.7 g (57%) of 2,10-dimethyl-6-(1,2,2,6,6-pentamethylpiperidin-4-ylamino)-4,8-di-tert-butyl-12H-dibenzo-[d,g][1,3,2]dioxaphosphocine (57%) (compound (101)) as a white powder, m.p. 207°-216° C. Analysis: calcd: C 73.57%; H 9.54%; N 5.19%; found: C 74.38%; H 10.03%; N 4.68%.

Provenance & Evidence