4-Methylmorpholine → (E)-N-cyclopropylhex-2-enamide

関与物質

反応条件

反応手順

A flask equipped with an overhead stirred, thermometer and addition funnel was placed under a nitrogen atmosphere then charged with (E)-hex-2-enoic acid (89.8 g, 787 mmol), EDCI (158.3 g, 826 mmol), HOBt (112.0 g, 826 mmol) and IPAc (890 mL) then cooled to 0±5° C. The addition funnel was charged with NMM (99.1 mL, 1.6 mol) which was then added to the reaction mixture maintaining the temperature at 0±5° C. The mixture was stirred for 30 minutes then cyclopropylamine (60.0 mL, 866 mmol) was added and the reaction allowed to warm to 25±5° C. over 16 hours. The reaction mixture was washed by adding hydrochloric acid (500 mL, 1.0 N) and the mixture stirred vigorously for 30 minutes then allowed to sit for 30 minutes; the layers were separated and the washing procedure repeated. Sodium hydroxide (500 mL, 1.0 N) was added and then the mixture stirred vigorously for 30 minutes then allowed to sit for 30 minutes; the layers were separated and base wash procedure repeated. Water (500 mL) was added and then the mixture stirred vigorously for 30 minutes then allowed to sit for 30 minutes; the layers were separated and the wash procedure repeated. The combined organic phases were concentrated under reduced pressure to ⅓ original volume then IPAc (600 mL) was added; this was repeated two times when a white precipitate formed. The slimy was then concentrated under atmospheric pressure to ⅔ original volume then cooled to 50±5° C. N-heptane (890 mL) was slowly added while the reaction was cooled to −5±5° C. and held at this temperature for 4 hours. The solid was filtered, washed with cold n-heptane (2×250 mL) and dried to provide compound 37 as a fine white solid. 1H NMR (500 MHz, d6-DMSO) 7.89 (s, 1H), 6.58 (dt, J=15.2, 7.0 Hz, 1H), 5.80 (dt, J=15.2, 1.3 Hz, 1H), 2.70-2.65 (m, 1H), 2.12-2.06 (m, 2H), 1.44-1.37 (m, 2H), 0.88 (t, J=7.3 Hz, 3H), 0.64-0.60 (m, 2H), 0.42-0.38 (m, 2H).

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