Benzaldehyde → HCID 59243437, compound

Participants

Reaction Conditions

Reaction Steps

(4bS,8aR)-4b-benzyl-7-oxo-4b,5,6,7,8,8a,9,10-octahydrophenanthrene-2-carboxylic acid (6.5 g, 19.44 mmol) was suspended in water (65 mL). 2.5 M NaOH (11.7 mL, 29.16 mmol) was added followed by benzaldehyde (2.16 mL, 21.38 mmol). Over time (at 50° C. for 4 hours or at 25° C. over night) the mixture became homogeneous. The reaction was considered complete when there was less than 2% of (4bS,8aR)-4b-benzyl-7-oxo-4b,5,6,7,8,8a,9,10-octahydrophenanthrene-2-carboxylic acid (Preparation 5) remaining. The mixture was cooled to 25° C. if it was not already at 25° C. EtOAc (65 mL) was added to the mixture followed by aqueous 2 M HCl (29 mL). Crystallization normally occurred during the acid addition or shortly thereafter. The mixture was stirred for 60 minutes. Heptane (65 mL) was added and the mixture was stirred for an additional 60 minutes. Do not worry about separating out the aqueous phase; filter the entire mixture and wash the solid with water followed by heptane. A pale yellow solid (6.55 g, 80% yield) was obtained. 1H NMR (DMSO): δ 1.70 (m, 1H), 1.85 (m, 1H), 2.45 (m, 3H), 2.65 (d, 3H), 2.95 (m, 2H), 3.50 (d, 1H), 6.15 (d, 2H), 6.25 (d, 1H), 6.70 (t, 2H), 6.90 (t, 1H), 7.30 (d, 1H), 7.50 (m, 5H), 7.70 (d, 2H), 12.75 (s, 1H).

Provenance & Evidence