ethyl 3-diazoindole-2-carboxylate

反应条件: temp:85.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Rhodium acetate dimer (30 mg) was added to a solution of solketal (0.87 ml) and ethyl 3-diazoindole-2-carboxylate (3 mg) in dichloroethane (10 ml), and stirred at 85° C. for 3 hours. The reaction was concentrated in vacuo and the residue purified by column chromatography using a gradient of 0% to 20% ethyl acetate:iso-hexane as eluent to afford the product as a pale yellow solid (435 mg, 97%); NMR d (CD3SOCD3) 1.27-1.38 (m, 9H), 3.88 (m, 1H), 4.11 (m, 3H), 4.30 (q, 2H), (m, 1H), 7.01 (t, 1H), 7.24 (t, 1H), 7.36 (d, 1H), 7.65 (d, 1H), 11.27 (s, 1H); M/z (+) 320.3 (MH+). The reaction was concentrated in vacuo the residue purified by column chromatography

反应条件: temp:85.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Rhodium acetate dimer (30 mg) was added to a solution of solketal (0.87 ml) and ethyl 3-diazoindole-2-carboxylate (3 mg) in dichloroethane (10 ml), and stirred at 85° C. for 3 hours. The reaction was concentrated in vacuo and the residue purified by column chromatography using a gradient of 0% to 20% ethyl acetate:iso-hexane as eluent to afford the product as a pale yellow solid (435 mg, 97%); NMR d (CD3SOCD3) 1.27-1.38 (m, 9H), 3.88 (m, 1H), 4.11 (m, 3H), 4.30 (q, 2H), (m, 1H), 7.01 (t, 1H), 7.24 (t, 1H), 7.36 (d, 1H), 7.65 (d, 1H), 11.27 (s, 1H); M/z (+) 320.3 (MH+). The reaction was concentrated in vacuo the residue purified by column chromatography

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: React 3-diazo-3H-indole-2-carboxylic acid ethyl ester, 5, (305 mg, 1.4 mmol) with benzyl alcohol (5.0 equiv., 0.73 mL, 7.05 mmol) as described in General Synthetic Procedure VIII to afford 3-benzyloxy-1H-indole-2-carboxylic acid ethyl ester 6 (R1=benzyl) as a white solid [MS obs=296 (M+1)]. Hydrolyze the ester to the carboxylic acid 7 (R1=benzyl) using General Synthetic Procedure IX and then transform the carboxylic acid to the corresponding primary amide as described in General Synthetic Procedure V to afford the title compound Iu as a tan solid (115 mg), tlc (silica gel) Rf=0.1.

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: React 3-diazo-3H-indole-2-carboxylic acid ethyl ester, 5, (231 mg, 1.10 mmol) with 4-methoxyphenol (1.4 equiv., 186 mg, 1.5 mmol) as described in General Synthetic Procedure VIII to afford 3-(4-methoxyphenoxy-1H-indole-2-carboxylic acid ethyl ester 6 (R1=4-methoxyphenyl, 169 mg, 51%) as an ivory-colored solid. Hydrolyze the ester to the carboxylic acid 7 (R1=4-methoxyphenyl) using General Synthetic Procedure IX and then transform the carboxylic acid to the corresponding primary amide as described in General Synthetic Procedure V to afford the title compound Im as a colorless oil, tlc (silica gel) Rf=0.10.

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: React 3-diazo-3H-indole-2-carboxylic acid ethyl ester, 5, (300 mg, 1.38 mmol) with phenol (5.0 equiv., 650 mg, 6.90 mmol) as described in General Synthetic Procedure VIII. Purify by flash chromatography to afford 3-phenoxy-1H-indole-2-carboxylic acid ethyl ester 6 (R1=phenyl, 303 mg, 78%) as a yellow solid. Hydrolyze the ester to the carboxylic acid 7 (R1=phenyl) using General Synthetic Procedure IX and then transform the carboxylic acid to the corresponding primary amide as described in General Synthetic Procedure V to afford the title compound Il as a light purple solid, tlc (silica gel) Rf=0.15. Purify by flash chromatography