Diisopropylethylamine → 1-Acetyl-5-chloro-1'-[trans-3-(4-chlorophenyl)allyl]spiro[indoline-3,4'-piperidine]

Participants

Reaction Conditions

Reaction Steps

A solution of 4-chlorocinnamyl chloride (4.0 g) in chloroform (120 ml) was added slowly to a stirred mixture of 1-acetyl-5-chlorospiro[indoline-3,4′-piperidine] (5.3 g) and diisopropylethylamine (6.7 ml) in chloroform (120 ml) under an atmosphere of nitrogen at room. The reaction was heated to 50° C. for 30 h. The reaction mixture was concentrated in vacuo to yield a red oil. Flash chromatography [SiO2; ethyl acetate-hexane-triethylamine (50:50:1)] yielded 5.1 g (68%) of the desired compound. 1H NMR (400 MHz, CDCl3) δ 5:1 mixture of rotamers. Major rotamer 1.70 (d, J=12 Hz, 2H), 2.0 (td, J=12 & 2 Hz), 2.08 (t, J=12 Hz, 2H), 2.25 (s, 3H), 3.03 (d, J=12 Hz, 2H), 3.20 (d, J=7 Hz, 2H), 3.96 (s, 2H), 6.28 (dt, J=12 & 5 Hz, 1H), 6.50 (d, J=12 Hz, 1H), 7.13 (d, J=1 Hz, 1H), 7.18 (dd, J=7 & 1 Hz, 1H), 7.3 (m, 4H), 8.15 (d, J=7 Hz, 1H). Minor rotamer (partial data) 2.42 (s, 3H), 4.00 (s, 2H). MS (ES+) 415/417/419 (M+H+).

Provenance & Evidence