Benzyl chloroformate → (+)-Benzyl{[7-(2-chlorophenyl)-2,3-dihydro-1-benzofuran-2-yl]methyl}carbamate

HRID 2115962Notes

Reaction equation

HRID 2115962 reaction equation
[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[C:8]1[C:16]2[O:15][CH:14]([CH2:17][NH2:18])[CH2:13][C:12]=2[CH:11]=[CH:10][CH:9]=1.C(N(C(C)C)CC)(C)C.Cl[C:29]([O:31][CH2:32][C:33]1[CH:38]=[CH:37][CH:36]=[CH:35][CH:34]=1)=[O:30]>>[CH2:32]([O:31][C:29](=[O:30])[NH:18][CH2:17][CH:14]1[CH2:13][C:12]2[CH:11]=[CH:10][CH:9]=[C:8]([C:3]3[CH:4]=[CH:5][CH:6]=[CH:7][C:2]=3[Cl:1])[C:16]=2[O:15]1)[C:33]1[CH:38]=[CH:37][CH:36]=[CH:35][CH:34]=1

Participants

4

Reactant 3

HCID 10387Benzyl chloroformateHCID 81531DiisopropylethylamineHCID 11960769HCID 11960769, compound

Product 1

HCID 86599242(+)-Benzyl{[7-(2-chlorophenyl)-2,3-dihydro-1-benzofuran-2-yl]methyl}carbamateYield 76%

Procedure

Treatment of (±)-1-[7-(2-chlorophenyl)-2,3-dihydro-1-benzofuran-2-yl]methanamine (0.743 g 2.52 mmol) with diisopropylethylamine (0.488 g, 3.77 mmol) and benzyl chloroformate (0.472 g, 2.77 mmol) generally according to the procedure described for Intermediate 12 afforded 0.749 g (76%) (±)-benzyl[7-(2-chlorophenyl)-2,3-dihydro-1-benzofuran-2-yl]methylcarbamate as a white solid. mp 155-157° C.; Anal. calcd. for C23H20ClNO3: C, 70.14; H, 5.12; N, 3.56. Found: C, 70.1; H, 5.15; N, 3.37. Chiral HPLC separation of (±)-benzyl[7-(2-chlorophenyl)-2,3-dihydro-1-benzofuran-2-yl]methylcarbamate (Chiralcel OJ, hexane:ethanol 1:1) provided two fractions. Fraction 1 (Rt=9.655 min, Chiralcel OJ, hexane:ethanol 1:1); Fraction 2 (Rt=16.300 min, Chiralcel OJ, hexane:ethanol 1:1).

Sources & evidence

ORD record
ord-f2d47741ac6848189ed35b55a9e991f4
Source dataset
uspto-grants-2008_10
Patent number
US07435837B2

Reaction notes

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