2-(isothiocyanatomethyl)oxolane

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

Procedure: A mixture of 2-amino-3,5-diiodobenzoic acid (1.09 g, 2.57 mmol), tetrahydrofurfuryl isothiocyanate (0.35 g, 2.43 mmol) and triethylamine (0.26 g, 2.57 mmol) in 3.5 mL of ethanol was heated to reflux for about 6 h, and then was allowed to cool to room temperature. The ensuing precipitate was filtered and washed with ethanol (1×20 mL), hexanes (1×mL), and then dried to deliver 0.86 g of the title compound of Step A. 1H NMR (400 MHz, Me2SO-d6): δ 1.64-1.75 (m,1H), 1.75-1.85 (m,1H), 1.86-2.0 (m,2H), 3.57-3.65 (m,1H), 3.70-3.81 (m,1H), 4.26-4.34 (m,1H), 4.36-4.44 (m,1H), 4.52-4.60 (m,1H), 8.19 (d,1H), 8.56 (d,1H), 10.1 (br s,1H). was heated to reflux for about 6 h The ensuing precipitate was filtered washed with ethanol (1×20 mL), hexanes (1×mL) dried

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

Procedure: A mixture of 2-amino-3,5-diiodobenzoic acid (1.09 g, 2.57 mmol), tetrahydrofurfuryl isothiocyanate (0.35 g, 2.43 mmol) and triethylamine (0.26 g, 2.57 mmol) in 3.5 mL of ethanol was heated to reflux for about 6 h, and then was allowed to cool to room temperature. The ensuing precipitate was filtered and washed with ethanol (1×20 mL), hexanes (1×mL), and then dried to deliver 0.86 g of the title compound of Step A. 1H NMR (400 MHz, Me2SO-d6): δ 1.64-1.75 (m,1H), 1.75-1.85 (m,1H), 1.86-2.0 (m,2H), 3.57-3.65 (m,1H), 3.70-3.81 (m,1H), 4.26-4.34 (m,1H), 4.36-4.44 (m,1H), 4.52-4.60 (m,1H), 8.19 (d,1H), 8.56 (d,1H), 10.1 (br s,1H). was heated to reflux for about 6 h The ensuing precipitate was filtered washed with ethanol (1×20 mL), hexanes (1×mL) dried

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

Procedure: A mixture of 2-amino-5-bromobenzoic acid (8.0 g, 37.0 mmol), tetrahydrofurfuryl isothiocyanate (5.0 g, 34.9 mmol) and triethylarine (5.0 mL, 3.6 g, 35.6 mmol) in ethanol (48 mL) was heated at reflux for 2 h. The reaction mixture was then allowed to cool to room temperature and filtered. The resulting filter cake was washed with 50 mL of cold ethanol, followed by 50 mL of hexanes to provide 10.8 g of the title compound of Step A as a solid melting at 230-232° C. IH NMR (400 MHz, Me2SO-d6): δ 1.63-2.0 (m,4H), 3.58-3.68 (m,1H), 3.74-3.82 (m,1H), 4.32 (dd,1H), 4.39-4.50 (m,1H), 4.58 (dd,1H), 7.37 (d,1H), 7.91 (d,1H), 8.02 (s,1H), 13.1 (br s,1H). was heated at reflux for 2 h filtered The resulting filter cake was washed with 50 mL of cold ethanol

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

Procedure: A mixture of 2-amino-5-bromobenzoic acid (8.0 g, 37.0 mmol), tetrahydrofurfuryl isothiocyanate (5.0 g, 34.9 mmol) and triethylamine (5.0 mL, 3.6 g, 35.6 mmol) in ethanol (48 mL) was heated at reflux for 2 h. The reaction mixture was then allowed to cool to room temperature and filtered. The resulting filter cake was washed with 50 mL of cold ethanol, followed by 50 mL of hexanes to provide 10.8 g of the title compound of Step A as a solid melting at 230-232° C. 1H NMR (400 MHz, Me2SO-d6): δ 1.63-2.0 (m,4H), 3.58-3.68 (m,1H), 3.74-3.82 (m,1H), 4.32 (dd,1H), 4.39-4.50 (m,1H), 4.58 (dd,1H), 7.37 (d,1H), 7.91 (d,1H), 8.02 (s,1H), 13.1 (br s,1H). was heated at reflux for 2 h filtered The resulting filter cake was washed with 50 mL of cold ethanol

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

Procedure: A mixture of 2-amino-3,5-diiodobenzoic acid (1.09 g, 2.57 mmol), tetrahydrofurfuryl isothiocyanate (0.35 g, 2.43 mmol) and triethylamine (0.26 g, 2.57 mmol) in 3.5 mL of ethanol was heated to reflux for about 6 h, and then was allowed to cool to room temperature. The ensuing precipitate was filtered and washed with ethanol (1×20 mL), hexanes (1×mL), and then dried to deliver 0.86 g of the title compound of Step A. 1H NMR (400 MHz, Me2SO-d6): δ 1.64-1.75 (m,1H), 1.75-1.85 (m,1H), 1.86-2.0 (m,2H), 3.57-3.65 (m,1H), 3.70-3.81 (m,1H), 4.26-4.34 (m,1H), 4.36-4.44 (m,1H), 4.52-4.60 (m,1H), 8.19 (d,1H), 8.56 (d,1H), 10.1 (br s,1H). was heated to reflux for about 6 h The ensuing precipitate was filtered washed with ethanol (1×20 mL), hexanes (1×mL) dried

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

Procedure: A mixture of 2-amino-5-bromobenzoic acid (8.0 g, 37.0 mmol), tetrahydrofurfuryl isothiocyanate (5.0 g, 34.9 mmol) and triethylarine (5.0 mL, 3.6 g, 35.6 mmol) in ethanol (48 mL) was heated at reflux for 2 h. The reaction mixture was then allowed to cool to room temperature and filtered. The resulting filter cake was washed with 50 mL of cold ethanol, followed by 50 mL of hexanes to provide 10.8 g of the title compound of Step A as a solid melting at 230-232° C. IH NMR (400 MHz, Me2SO-d6): δ 1.63-2.0 (m,4H), 3.58-3.68 (m,1H), 3.74-3.82 (m,1H), 4.32 (dd,1H), 4.39-4.50 (m,1H), 4.58 (dd,1H), 7.37 (d,1H), 7.91 (d,1H), 8.02 (s,1H), 13.1 (br s,1H). was heated at reflux for 2 h filtered The resulting filter cake was washed with 50 mL of cold ethanol

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

Procedure: A mixture of 2-amino-5-bromobenzoic acid (8.0 g, 37.0 mmol), tetrahydrofurfuryl isothiocyanate (5.0 g, 34.9 mmol) and triethylamine (5.0 mL, 3.6 g, 35.6 mmol) in ethanol (48 mL) was heated at reflux for 2 h. The reaction mixture was then allowed to cool to room temperature and filtered. The resulting filter cake was washed with 50 mL of cold ethanol, followed by 50 mL of hexanes to provide 10.8 g of the title compound of Step A as a solid melting at 230-232° C. 1H NMR (400 MHz, Me2SO-d6): δ 1.63-2.0 (m,4H), 3.58-3.68 (m,1H), 3.74-3.82 (m,1H), 4.32 (dd,1H), 4.39-4.50 (m,1H), 4.58 (dd,1H), 7.37 (d,1H), 7.91 (d,1H), 8.02 (s,1H), 13.1 (br s,1H). was heated at reflux for 2 h filtered The resulting filter cake was washed with 50 mL of cold ethanol