2-bromo-2-methyl-N-phenylmethoxypropanamide

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Elimination product from the reaction attempted cycloaddition of 4g with LiClO4/Et3N in diethyl ether. 1H NMR (400 MHz, CDCl3) δ 8.19 (br s, 1H), 7.49-7.29 (m, 5H), 5.55 (pent, J=1 Hz, 1H), 5.32 (dq, J=1.6, 1.0 Hz, 1H), 4.96 (s, 2H), and 1.92 (dd, J=1.6, 1.2 Hz, 3H); 13C NMR (101 MHz, CDCl3) δ 167.2, 138.0, 135.4, 129.5, 129.0, 128.8, 120.4, 78.3, and 18.6; IR (film) 3199 (br), 3064, 3032, 2954, 2878, 1658, 1620, 1496, 1453, 1372, 1322, 1209, 1039 cm-1; HR-ESIMS calculated for C11H13NNaO2 (M+Na)+ 215.0871, found 215.0869.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Produced as a by-product 56% from the reaction of 2-bromo-2-methyl-N-(phenylmethoxy)propanamide with TEA in furan and trifluoroethanol. Rf=0.26 (3:1, hexanes:EtOAc); 1H NMR (500 MHz, CDCl3) δ 8.88 (s, 1H), 7.56-7.31 (m, 5H), 4.94 (s, 2H), 3.68 (q, J=8.3 Hz, 2H), 1.43 (s, 6H); 13C NMR (125 MHz, CDCl3) 13C NMR (101 MHz, cdcl3) δ 170.8, 134.9, 129.4, 129.0, 128.7, 123.7 (q, J=278 Hz), 80.4, 78.3, 61.6 (q, J=35 Hz), and 23.6; FT-IR 3218 (br), 3036; 2942, 2886, 1663 (st), 1430, 1455, 1485, 1386, 1369, 1307, 1285, 1217, 1181, 1145, 1029, 1010 cm-1; HR-ESIMS calculated for C13H17F3NO3 (M+H)+ 292.1155, observed 292.1160. Produced as a by-product 56%

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Prepared in 87% yield (3.53 g, 11.3 mmol) from the reaction of 2-bromo-2-methylpropanoyl bromide (3.0 g, 13 mmol) with O-benzylhydroxylamine hydrochloride (2.13 g, 13 mmol) via general procedure A. Rf=0.58 (3:1, hexanes:EtOAc); mp=88.6-91.1° C.; 1H-NMR (500 MHz, CDCl3): δ 9.05 (br s, 1H), 7.45-7.34 (m, 5H), 4.94 (s, 2H), and 1.93 (s, 6H); 13C-NMR (126 MHz, CDCl3): δ 169.7, 134.9, 129.6, 129.1, 128.8, 78.4, 59.5, and 32.6; FT-IR (neat) 3195 (br), 3034, 2954, 2890, 1652 (s), 1505, 1469, 1454, 1112, 1032, 1004 cm-1. HRESI-MS: calcd □ for C11H18BrN2O2 (M+NH4)+ 289.0546, observed 289.0543.