Binap, (A+-)- → HCID 58899093, compound

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Reaction Steps

To a flask equipped with a magnetic stirrer, reflux condenser, and nitrogen inlet was added 2,3-dihydro-1-benzofuran-5-amine (4.53 grams, 33.3 mmoles, prepared as in Example 23 of U.S. Pat. No. 20040029932), 5-bromo-2,3-dihydrobenzofuran (6.63 grams, 32.9 mmoles), tris(dibenzylideneacetone)dipalladium (0) (0.61 grams, 0.67 mmoles), rac-2,2′-bis(diphenylphosphino)-1,1′-binapthyl (0.83 grams, 1.33 mmoles), sodium tert-butoxide (6.44 grams, 66.6 mmoles) and anhydrous toluene (60 mL). The contents of the flask were refluxed for three days; cooled to room temperature; and filtered through a pad of silica gel. The silica gel pad was then eluted with dichloromethane (200 mL). The combined organic layers were concentrated in vacuo to yield a dark yellow oil. The solid was chromatographed on silica gel, eluting with a hexane/ethyl acetate gradient. The resulting solid was recrystallized from ethanol to afford 1.8 grams of the desired product as a white solid. 1H NMR (CDCl3/D2O) δ 6.55-6.95 (m, 6H), 4.5 (t, 4H), 3.15 (t, 4H).

Provenance & Evidence