Reaction
Starting material for the preparation of a variety of 3,3'-substituted binaphthols.
Chemical Properties
Colorless solid
Uses
3- or 3,3′-di-substituted products can be obtained easily via ortho-metallation and subsequent treatment with an electrophile to give the corresponding BINOL derivatives.
Uses
An intermediate in the symmetric synthesis of BINOL-terpyridine ligands.
Synthesis
Sodium hydride (NaH, 1.92 g, 80 mmol) was slowly added to N,N-dimethylformamide (DMF, 30 mL) under ice bath conditions. Subsequently, a tetrahydrofuran (THF, 50 mL) solution of 1,1'-bi-2-naphthol (BINOL, 10 g, 34 mmol) was added slowly dropwise to the above mixture for 20 min. after 30 min, chloromethyl methyl ether (6.4 g, 80 mmol) was added slowly dropwise for the same period of time. The reaction process was monitored by thin layer chromatography (TLC). The reaction mixture was extracted with chloroform and water after stirring for 1 h. The organic layer was separated to obtain the crude product. The crude product was further purified by silica gel column chromatography with petroleum ether/ethyl acetate (5:1, v/v) as eluent. Finally, (R)-2,2'-bis(methoxymethoxy)-1,1'-binaphthyl was obtained in 90% yield. The structure of the product was confirmed by 1H NMR (400 MHz, CDCl3): δ 7.95-7.93 (d, J = 9.6 Hz, 2H), 7.87-7.85 (d, J = 8.4 Hz, 2H), 7.58-7.56 (d, J = 9.6 Hz, 2H), 7.35-7.31 (m, 2H), 7.23-7.14 (m, 4H ), 5.08-4.96 (q, J = 6.8 Hz, 4H), 3.13 (s, 6H).
References
[1] Organic Letters, 2004, vol. 6, # 16, p. 2701 - 2704
[2] Tetrahedron Asymmetry, 2002, vol. 13, # 19, p. 2161 - 2166
[3] Chemistry - A European Journal, 2018, vol. 24, # 48, p. 12607 - 12612
[4] Chemistry Letters, 1995, # 12, p. 1113 - 1114
[5] Organic Preparations and Procedures International, 1995, vol. 27, # 6, p. 685 - 690
