Binap, (A+-)- → 2-Chloro-11,12-dihydro-6H-5-oxa-11-aza-dibenzo[a,e]cyclooctene

Participants

Reaction Conditions

Reaction Steps

To a stirred mixture of 2-(2-Bromo-benzyloxy)-5-chloro-benzylamine Example 348B (112 mg, 0.34 mmol), BINAP (43.1 mg, 69.3 mmol), and NaO-t-Bu (100 mg, 34.7 mmol) in anhydrous toluene (3.0 mL) under argon was added Pd(dba)2 (20.0 mg, 1.04 mmol). This mixture was heated at 120° C. in a sealed tube for 1 hour and then cooled to room temperature. The mixture was diluted with saturated NaHCO3 solution (40 mL), further saturated with solid NaHCO3, and then extracted with EtOAc (2×60 mL). The combined EtOAc extracts were dried (MgSO4), filtered and concentrated in vacuo. The crude was purified by a ISCO auto CombiFlash with a RediSep 10 g column, eluted with CH2Cl2-EtOAc, detected at 220 nM to give 44 mg of desired 2-Chloro-11,12-dihydro-6H-5-oxa-11-aza-dibenzo[a,e]cyclooctene Example 348C in 51% yield. HPLC Rt=2.05 min (YMC S5 ODS column 4.6×50 mm, 10-90% aqueous methanol over 4 minutes containing 0.2% phosphoric acid, 4 mL/min, monitoring at 220 nm) LC/MS: M+H=246

Provenance & Evidence