methyl 2-isothiocyanatoacetate

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 2-(3,4-dichlorophenyl)-4-(1-hydrazonoethyl)thiophen-3-ol (30 mg, 0.10 mmol) prepared in Reference Synthetic Example 1 and methyl 2-isothiocyanatoacetate (20 mg, 0.15 mmol) in dimethyl formamide (300 μL) was stirred at room temperature, 40° C. and 50° C. for 2 hours, respectively. After addition of methanol-water, the solution was stirred at room temperature for 0.5 hour, and the resulting crystals were collected by filtration as the desired product (yield 0.72%). the solution was stirred at room temperature for 0.5 hour

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 2-(3,4-dichlorophenyl)-4-(1-hydrazonoethyl)thiophen-3-ol (30 mg, 0.10 mmol) prepared in Reference Synthetic Example 1 and methyl 2-isothiocyanatoacetate (20 mg, 0.15 mmol) in dimethyl formamide (300 μL) was stirred at room temperature, 40° C. and 50° C. for 2 hours, respectively. After addition of methanol-water, the solution was stirred at room temperature for 0.5 hour, and the resulting crystals were collected by filtration as the desired product (yield 0.72%). the solution was stirred at room temperature for 0.5 hour

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Into a 13×100 mm screw cap Pyrex® vial were added 6-amino-1,3-benzothiazole-2-thiol (108 mg, 0.59 mmol), methyl-2-isothiocyanatoacetate (94.8 mg, 0.72 mmol), and pyridine (2 ml). The vial was purged with Ar, capped, and shaken in an oven at 60° C. for 8 h. The solution was concentrated, and the residue was triturated with Et2O to give a rusty brown powder (59 mg, 35%). 1H NMR (DMSO-d6) δ=4.27 (s, 2H), 7.26 (d, 1H), 7.35 (d, 1H), 7.61 (s, 1H), 10.40 (s, 1H), 13.86 (br s, 1H); ESIMS: m/z 280 (M−H); mp>266° C. Into a 13×100 mm screw cap Pyrex® The vial was purged with Ar capped The solution was concentrated the residue was triturated with Et2O

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Into a 13×100 mm screw cap Pyrex® vial were added 6-amino-1,3-benzothiazole-2-thiol (108 mg, 0.59 mmol), methyl-2-isothiocyanatoacetate (94.8 mg, 0.72 mmol), and pyridine (2 ml). The vial was purged with Ar, capped, and shaken in an oven at 60° C. for 8 h. The solution was concentrated, and the residue was triturated with Et2O to give a rusty brown powder (59 mg, 35%). 1H NMR (DMSO-d6) δ=4.27 (s, 2H), 7.26 (d, 1H), 7.35 (d, 1H), 7.61 (s, 1H), 10.40 (s, 1H), 13.86 (br s, 1H); ESIMS: m/z 280 (M−H); mp>266° C. Into a 13×100 mm screw cap Pyrex® The vial was purged with Ar capped The solution was concentrated the residue was triturated with Et2O

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

Procedure: Methyl N-(thioxomethylene)glycinate (2.06 g) and thiophene-2-carbohydrazide (2.57 g) in isopropanol (50 ml) was heated at 70° C. while stirring for 16 h. The mixture was allowed to come to r.t. and the formed precipitate collected and heated at reflux in 1.0 M aqueous NaHCO3 solution for 2 h. After cooling to r.t. and acidification with conc. HCl (aq.) the product was extracted into EA, which was washed with brine and then dried over MgSO4 before concentration to dryness to yield crude title compound which was used directly in the next step. to come to r.t. the formed precipitate collected heated at reflux in 1.0 M aqueous NaHCO3 solution for 2 h acidification with conc. HCl (aq.) the product was extracted into EA, which was washed with brine dried over MgSO4 before concentration to dryness

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Into a 13×100 mm screw cap Pyrex® vial were added 6-amino-1,3-benzothiazole-2-thiol (108 mg, 0.59 mmol), methyl-2-isothiocyanatoacetate (94.8 mg, 0.72 mmol), and pyridine (2 ml). The vial was purged with Ar, capped, and shaken in an oven at 60° C. for 8 h. The solution was concentrated, and the residue was triturated with Et2O to give a rusty brown powder (59 mg, 35%). 1H NMR (DMSO-d6) δ=4.27 (s, 2H), 7.26 (d, 1H), 7.35 (d, 1H), 7.61 (s, 1H), 10.40 (s, 1H), 13.86 (br s, 1H); ESIMS: m/z 280 (M−H); mp>266° C. Into a 13×100 mm screw cap Pyrex® The vial was purged with Ar capped The solution was concentrated the residue was triturated with Et2O

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 2-(3,4-dichlorophenyl)-4-(1-hydrazonoethyl)thiophen-3-ol (30 mg, 0.10 mmol) prepared in Reference Synthetic Example 1 and methyl 2-isothiocyanatoacetate (20 mg, 0.15 mmol) in dimethyl formamide (300 μL) was stirred at room temperature, 40° C. and 50° C. for 2 hours, respectively. After addition of methanol-water, the solution was stirred at room temperature for 0.5 hour, and the resulting crystals were collected by filtration as the desired product (yield 0.72%). the solution was stirred at room temperature for 0.5 hour