1,4-Dioxane → (1R,3S)-3-[(tert-Butoxy)carbonyl]-2,2-dimethylcyclobutane-1-carboxylic acid

Participants

Reaction Steps

A stirred solution of (1S,3R)-tert-butyl 3-acetyl-2,2-dimethylcyclobutanecarboxylate (2.4 g, 10.62 mmol) in dioxane (270 ml) aqueous NaOBr solution (about 180 ml) was added slowly at about 0° C. and stirred at the same temperature for about 3 hours then allowed to stirred at room temperature for about 4 hours (the yellow colored solution turned to white color). After completion of the reaction (monitored by TLC), the reaction mixture was washed with methyl t-butyl ether (3×150 ml), the aqueous layer was adjusted pH (2-3) with 1N HCl and the aqueous layer was extracted with EtOAc and dried over Na2SO4 and the solvent was evaporated to afford title compound as an off white liquid. Wt: 1.9 g; Yield: 78%; 1H NMR (300 MHZ, CDCl3): δ 2.82-2.67 (m, 2H), 2.57-2.50 (m, 1H), 2.04-1.98 (m, 1H), 1.42 (s, 9H), 1.34 (s, 3H), 1.05 (s, 3H); IR (KBr, cm−1): 3205, 1731, 1694, 1460, 1371, 1236, 1157, 1108, 846, 721; Mass: [M+Na]+ 251 (40%).

Provenance & Evidence