Br[C:2]1[CH:11]=[CH:10][C:9]2[C:4](=[CH:5][CH:6]=[C:7]([O:12][C@H:13]3[CH2:18][CH2:17][C@H:16]([C:19]([CH3:22])([CH3:21])[CH3:20])[CH2:15][CH2:14]3)[CH:8]=2)[CH:3]=1.[Li]CCCC.CN([CH:31]=[O:32])C.Cl>C1COCC1>[C:19]([C@H:16]1[CH2:17][CH2:18][C@H:13]([O:12][C:7]2[CH:8]=[C:9]3[C:4](=[CH:5][CH:6]=2)[CH:3]=[C:2]([CH:31]=[O:32])[CH:11]=[CH:10]3)[CH2:14][CH2:15]1)([CH3:22])([CH3:21])[CH3:20]2-bromo-6-(trans-4-tert-butylcyclohexyloxy)naphthalene (2.249 g, 6.25 mmol, 1.0 eq.) was dissolved in THF (10 mL) under nitrogen atmosphere. Then the mixture was cooled down to −78° C. and a solution of n-BuLi in THF (2.5 M, 7.5 mL, 18.8 mmol, 3.0 eq.) was added to the mixture dropwise. The mixture was stirred at −78° C. for 15 min. then DMF (2.4 mL, 31.2 mmol, 5.0 eq.) was added to the mixture and stirred at −78° C. for 1 h. When the reaction completed, 1 M HCl was added to adjust the pH to 6. The mixture was extracted with EtOAc and the organic layer was concentrated and purified by silica gel chromatography using petroleum ether/ethyl acetate (10/1) as eluent to give 6-(trans-4-tert-butylcyclohexyloxy)-2-naphthaldehyde as a white solid (1.16 g, 60%). EDI-MS: 311.1 (M+H)+. 1H NMR (400 MHz, CDCl3) δ 10.08 (s, 1H), 8.24 (s, 1H), 7.92-7.87 (m, 2H), 7.77 (d, 1H), 7.22-7.19 (m, 2H), 4.42-4.30 (m, 1H), 2.30-2.28 (m, 2), 1.93-1.90 (m, 2H), 1.48-1.11 (m, 5H), 0.82 (s, 9H).
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