Triethylamine → 6-allyl-3-((S)-3-(tert-butyldimethylsilyloxy)-3-methylbutan-2-yl)-6-phenyl-1,3-oxazinan-2-one

Participants

Reaction Steps

To a solution of 1-((S)-3-(tert-butyldimethylsilyloxy)-3-methylbutan-2-ylamino)-3-phenylhex-5-en-3-ol (550 mg, 1.41 mmol) and Et3N (1.4 g, 14.1 mmol) in CH2Cl2 (5 mL) was added triphosgene (138 mg, 0.46 mmol) at 0° C. The formed mixture was heated to reflux overnight. The mixture was washed with water. The organic phase was separated and concentrated to give the crude product which was purified by TLC to afford 6-allyl-3-((2S)-3-(tert-butyldimethylsilyloxy)-3-methylbutan-2-yl)-6-phenyl-1,3-oxazinan-2-one (100 mg, 17%). 1H NMR (CDCl3): 0.00 (s, 6H), 0.73 (s, 9H), 1.08 (s, 3H), 1.12 (d, 3H), 1.21 (s, 3H), 2.83 (q, 1H), 4.08 (brs, 1H).

Provenance & Evidence