9H-xanthene-9-carboxamide

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

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

Procedure: POCl3 (25 mL) was added to crystalline 9H-Xanthene-9-carboxamide [26] (1.5 g, 6.65 mmol) while stirring. The solution was then heated at reflux (45 min), when TLC showed complete absence of starting material. The solution was then poured into a mixture of crushed ice and NH4OH with vigorous stirring. The solution was stirred (15 min) and excess of NH4OH was added to keep the solution alkaline. The solid formed was extracted with ether (3×50 ml). The combined ether extracts were washed with water and brine, dried (MgSO4) and evaporated under reduced pressure to give an yellow oil which crystallized immediately. The product was purified by mplc using pet. ether: acetone (8:2) as eluent to give 1.2 g (87%) 9H-Xanthene-9-carbonitrile as colorless needles, mp 97-98° C. (EtOH). The solution was then heated at reflux (45 min), when TLC The solution was stirred (15 min) The solid formed was extracted with ether (3×50 ml) The combined ether extracts were washed with water and brine dried (MgSO4) evaporated under reduced pressure to give an yellow oil which crystallized immediately The product was purified by mplc

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

Procedure: The title compound, white solid, m.p. 222° C. and MS: m/e=295 (M4) was prepared in accordance with the general method of example 39 from 9H-xanthene-9-carboxylic acid amide and propanecarboxylic acid chloride.

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

Procedure: To a stirred suspension of sodium boronhydride (1.89 g, 50 mmol) and 9-xanthencarboxamide (2.25 g, 10 mmol) in dioxane (20 mL) was added acetic acid (3.0 g, 50 mmol) in dioxane (10 mL) over a period of 10 minutes at 10° C.; the reaction mixture was stirred at reflux for 2 hours. The reaction mixture was concentrated to dryness in vacuo, excess reagent was decomposed with water and the solution extracted with chloroform. The extract was washed with water and dried over anhydrous sodium sulphate. The chloroform layer was evaporated in vacuo and the residue was purified by silica gel column chromatography (ethylacetate:methanol, 9:1 as eluent) to give a white solid (1.6 g, 7.6 mmol) in 76.2% yield. at reflux for 2 hours The reaction mixture was concentrated to dryness in vacuo, excess reagent the solution extracted with chloroform The extract was washed with water dried over anhydrous sodium sulphate The chloroform layer was evaporated in vacuo the residue was purified by silica gel column chromatography (ethylacetate:methanol, 9:1 as eluent)

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

Procedure: To a stirred suspension of sodium boronhydride (1.89 g, 50 mmol) and 9-xanthencarboxamide (2.25 g, 10 mmol) in dioxane (20 mL) was added acetic acid (3.0 g, 50 mmol) in dioxane (10 mL) over a period of 10 minutes at 10° C.; the reaction mixture was stirred at reflux for 2 hours. The reaction mixture was concentrated to dryness in vacuo, excess reagent was decomposed with water and the solution extracted with chloroform. The extract was washed with water and dried over anhydrous sodium sulphate. The chloroform layer was evaporated in vacuo and the residue was purified by silica gel column chromatography (ethylacetate:methanol, 9:1 as eluent) to give a white solid (1.6 g, 7.6 mmol) in 76.2% yield. at reflux for 2 hours The reaction mixture was concentrated to dryness in vacuo, excess reagent the solution extracted with chloroform The extract was washed with water dried over anhydrous sodium sulphate The chloroform layer was evaporated in vacuo the residue was purified by silica gel column chromatography (ethylacetate:methanol, 9:1 as eluent)

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

Procedure: To a stirred suspension of sodium boronhydride (1.89 g, 50 mmol) and 9-xanthencarboxamide (2.25 g, 10 mmol) in dioxane (20 mL) was added acetic acid (3.0 g, 50 mmol) in dioxane (10 mL) over a period of 10 minutes at 10° C.; the reaction mixture was stirred at reflux for 2 hours. The reaction mixture was concentrated to dryness in vacuo, excess reagent was decomposed with water and the solution extracted with chloroform. The extract was washed with water and dried over anhydrous sodium sulphate. The chloroform layer was evaporated in vacuo and the residue was purified by silica gel column chromatography (ethylacetate:methanol, 9:1 as eluent) to give a white solid (1.6 g, 7.6 mmol) in 76.2% yield. at reflux for 2 hours The reaction mixture was concentrated to dryness in vacuo, excess reagent the solution extracted with chloroform The extract was washed with water dried over anhydrous sodium sulphate The chloroform layer was evaporated in vacuo the residue was purified by silica gel column chromatography (ethylacetate:methanol, 9:1 as eluent)

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

Procedure: The title compound, white solid, m.p. 222° C. and MS: m/e=295 (M+) was prepared in accordance with the general method of example 39 from 9H-xanthene-9-carboxylic acid amide and propanecarboxylic acid chloride.

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

Procedure: The title compound, white solid, m.p. 222° C. and MS: m/e=295 (M+) was prepared in accordance with the general method of example 39 from 9H-xanthene-9-carboxylic acid amide and propanecarboxylic acid chloride.

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

Procedure: POCl3 (25 mL) was added to crystalline 9H-Xanthene-9-carboxamide [26] (1.5 g, 6.65 mmol) while stirring. The solution was then heated at reflux (45 min), when TLC showed complete absence of starting material. The solution was then poured into a mixture of crushed ice and NH4OH with vigorous stirring. The solution was stirred (15 min) and excess of NH4OH was added to keep the solution alkaline. The solid formed was extracted with ether (3×50 ml). The combined ether extracts were washed with water and brine, dried (MgSO4) and evaporated under reduced pressure to give an yellow oil which crystallized immediately. The product was purified by mplc using pet. ether: acetone (8:2) as eluent to give 1.2 g (87%) 9H-Xanthene-9-carbonitrile as colorless needles, mp 97-98° C. (EtOH). The solution was then heated at reflux (45 min), when TLC The solution was stirred (15 min) The solid formed was extracted with ether (3×50 ml) The combined ether extracts were washed with water and brine dried (MgSO4) evaporated under reduced pressure to give an yellow oil which crystallized immediately The product was purified by mplc

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

Procedure: POCl3 (25 mL) was added to crystalline 9H-Xanthene-9-carboxamide [26] (1.5 g, 6.65 mmol) while stirring. The solution was then heated at reflux (45 min), when TLC showed complete absence of starting material. The solution was then poured into a mixture of crushed ice and NH4OH with vigorous stirring. The solution was stirred (15 min) and excess of NH4OH was added to keep the solution alkaline. The solid formed was extracted with ether (3×50 ml). The combined ether extracts were washed with water and brine, dried (MgSO4) and evaporated under reduced pressure to give an yellow oil which crystallized immediately. The product was purified by mplc using pet. ether: acetone (8:2) as eluent to give 1.2 g (87%) 9H-Xanthene-9-carbonitrile as colorless needles, mp 97-98° C. (EtOH). The solution was then heated at reflux (45 min), when TLC The solution was stirred (15 min) The solid formed was extracted with ether (3×50 ml) The combined ether extracts were washed with water and brine dried (MgSO4) evaporated under reduced pressure to give an yellow oil which crystallized immediately The product was purified by mplc

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

Procedure: The title compound, white solid, m.p. 222° C. and MS: m/e=295 (M4) was prepared in accordance with the general method of example 39 from 9H-xanthene-9-carboxylic acid amide and propanecarboxylic acid chloride.

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

Procedure: The title compound, white solid, m.p. 222° C. and MS: m/e=295 (M4) was prepared in accordance with the general method of example 39 from 9H-xanthene-9-carboxylic acid amide and propanecarboxylic acid chloride.