N-chlorosuccinamide → tert-Butyl N-(4-{1-[1-(3-chloro-4-methoxyphenyl)-3-oxopropyl]pentyl}benzoyl)-beta-alaninate

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Reaction Steps

N-Chlorosuccinamide (40 mg, mmol) was added to an acetonitrile solution (2 ml) containing enantiopure tert-butyl N-(4-{1-[1-(4-methoxyphenyl)-3-oxopropyl]pentyl}benzoyl)-β-alaninate (20 mg, 0.42 mol), which was prepared following the procedure described in Example 1. The solution was then heated in a screw cap tube for 35 minutes at 85° C. The solution was concentrated and the residue purified by PTLC using an EtOAC/hexanes eluent to give a mixture of compounds containing the title compound and the corresponding 3,5-diCl analog (˜30% by NMR). LC1 4.00 min. (M+H) 460, di Cl LC1 4.15 min. (M+H) 494 selected data 1H NMR (400 MHz, CDCl3): δ 9.35 (s, 1H); 7.72 (d, J=8.2 Hz, 2H); 7.23-7.15 (m, 3H); 6.86 (d, J=8.4 Hz, 2H); 3.88 (S, 3H); 3.68 (q, J=5.9 Hz, 2H); 3.29-3.23 (m, 1H); 2.75-2.65 (m, 1H); 2.56-2.50 (m, 2H); 2.39-2.31 (m, 1H); 1.46 (s, 9H); 0.66 (t, 3H).

Provenance & Evidence