2-diazo-1-phenylethanone

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

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

Procedure: To a solution of 17-ethyl-1-hydroxy-14-(tert-butyldimethylsiloxy)-12-[2'-(4"-hydroxy-3"-methoxycyclohexyl)-1'-methylvinyl]-23,25-dimethoxy-13,19,21,27-tetramethyl-11,28-dioxa-4-azatricyclo[22.3.1.04,9 ]octacos-18-ene-2,3,10,16-tetraone (500 mg) and rhodium acetate (5 mg, 2 mol %) in dichloromethane (4 ml) was added α-diazoacetophenone (159 mg, 2 eq.) in dichloromethane (2 ml) dropwise. The reaction mixture was stirred for 15 minutes after the addition and then filtered through a silica gel pad washing with ethyl acetate. The filtrate was concentrated and purified by column chromatography on silica gel eluting with 60% hexane:40% ethyl acetate to give the desired product (188 mg). after the addition filtered through a silica gel pad washing with ethyl acetate The filtrate was concentrated purified by column chromatography on silica gel eluting with 60% hexane

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of azide 2i (74 mg, 0.459 mmol) in anhydrous toluene (1.5 mL) was cooled to 0° C. A solution of phosphine 1e (171 mg, 0.482 mmol) in toluene (1.0 mL) was added dropwise. The resulting solution was maintained at 0° C. for 2 h and was then allowed to warm to room temperature. The mixture was then diluted with anhydrous CH2Cl2 (5 mL) and was stirred for an additional 30 min. The solution was then placed directly on a column of silica gel and eluted with 15% EtOAc/hexanes to give diazo-compound 5i as a yellow oil (33 mg, 0.226 mmol, 49% yield). to warm to room temperature eluted with 15% EtOAc/hexanes

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

Procedure: A solution of ethyl 4-(4-chloro-2-nitrophenyl)-4-oxo-2-butynoate (prepared as described in Example 48(a)) (1.2 g, 4.11 mmol) and diazoacetophenone (1.2 g, 8.22 mmol, prepared as described in Org. Syn. Coll. Vol. VI, pp. 386-388) in tetrahydrofuran (THF) (21.6 mL) was stirred at room temperature for 16 hours. The reaction was concentrated by rotary evaporation and purified by flash chromatography eluting with hexanes:ethyl acetate (90:10, 80:20, 70:30) to give the title compound (1.3 g, 74.3%); Rf 0.38 (1:1 ethyl acetate:hexanes). The reaction was concentrated by rotary evaporation purified by flash chromatography eluting with hexanes:ethyl acetate (90:10, 80:20, 70:30)

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

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

Procedure: A solution of ethyl 4-(4-chloro-2-nitrophenyl)-4-oxo-2-butynoate (prepared as described in Example 48(a)) (1.2 g, 4.11 mmol) and diazoacetophenone (1.2 g 8.22 mmol, prepared as described in Org. Syn. Coll. Vol. VI. pp. 386-388) in tetrahydrofiuran (THF) (21.6 mL) was stirred at room temperature for 16 hours. The reaction was concentrated by rotary evaporation and purified by flash chromatography eluting with hexanes:ethyl acetate (90:10, 80:20, 70:30) to give the title compound (1.3 g, 74.3%); Rf 0.38 (1:1 ethyl acetate:hexanes). The reaction was concentrated by rotary evaporation purified by flash chromatography eluting with hexanes:ethyl acetate (90:10, 80:20, 70:30)

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

Procedure: To a solution of 17-ethyl-1-hydroxy-14-(tert-butyldimethylsiloxy)-12-[2'-(4"-hydroxy-3"-methoxycyclohexyl)-1'-methylvinyl]-23,25-dimethoxy-13,19,21,27-tetramethyl-11,28-dioxa-4-azatricyclo[22.3.1.04,9 ]octacos-18-ene-2,3,10,16-tetraone (500 mg) and rhodium acetate (5 mg, 2 mol %) in dichloromethane (4 ml) was added α-diazoacetophenone (159 mg, 2 eq.) in dichloromethane (2 ml) dropwise. The reaction mixture was stirred for 15 minutes after the addition and then filtered through a silica gel pad washing with ethyl acetate. The filtrate was concentrated and purified by column chromatography on silica gel eluting with 60% hexane:40% ethyl acetate to give the desired product (188 mg). after the addition filtered through a silica gel pad washing with ethyl acetate The filtrate was concentrated purified by column chromatography on silica gel eluting with 60% hexane

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of azide 2i (74 mg, 0.459 mmol) in anhydrous toluene (1.5 mL) was cooled to 0° C. A solution of phosphine 1e (171 mg, 0.482 mmol) in toluene (1.0 mL) was added dropwise. The resulting solution was maintained at 0° C. for 2 h and was then allowed to warm to room temperature. The mixture was then diluted with anhydrous CH2Cl2 (5 mL) and was stirred for an additional 30 min. The solution was then placed directly on a column of silica gel and eluted with 15% EtOAc/hexanes to give diazo-compound 5i as a yellow oil (33 mg, 0.226 mmol, 49% yield). to warm to room temperature eluted with 15% EtOAc/hexanes

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

Procedure: To a solution of 17-ethyl-1-hydroxy-14-(tert-butyldimethylsiloxy)-12-[2'-(4"-hydroxy-3"-methoxycyclohexyl)-1'-methylvinyl]-23,25-dimethoxy-13,19,21,27-tetramethyl-11,28-dioxa-4-azatricyclo[22.3.1.04,9 ]octacos-18-ene-2,3,10,16-tetraone (500 mg) and rhodium acetate (5 mg, 2 mol %) in dichloromethane (4 ml) was added α-diazoacetophenone (159 mg, 2 eq.) in dichloromethane (2 ml) dropwise. The reaction mixture was stirred for 15 minutes after the addition and then filtered through a silica gel pad washing with ethyl acetate. The filtrate was concentrated and purified by column chromatography on silica gel eluting with 60% hexane:40% ethyl acetate to give the desired product (188 mg). after the addition filtered through a silica gel pad washing with ethyl acetate The filtrate was concentrated purified by column chromatography on silica gel eluting with 60% hexane

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

Procedure: Ethenylidene bisphosphonic acid tetraethyl ester (II, PREPARATION 1, 6.00 g) in ether (20 ml) is treated with solid 2-diazo-1-phenylethanone (2.92 g) and stirred at 22° for 20 hrs. The precipitate is collected and washed with ether to give the title compound. An analytical sample is obtained by recrystallization from methylene chloride/hexane, mp 133.5°-134°; MS (m/e) 446, 327, 309, 281, 271, 253, 243, 215, 175; IR (mineral oil mull) 3183, 1631, 1600, 1578, 1548, 1433, 1260, 1242, 1161, 1067, 1043, 1020, 1001, 995, 976 and 962 cm-1 ; NMR (CDCl3) 8.10, 7.50, 6.90, 4.27, 3.69 and 1.34 δ. The precipitate is collected washed with ether

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

Procedure: Sodium hydride (50% in oil, 0.53 g) is suspended in ether (20 ml), cooled to 0°, then treated dropwise with a mixture of acetophenone 1.2 ml) and ethyl formate (0.90 ml). The reaction is stirred 1 hr at 0° then overnight at 22°. The precipitate is filtered and washed well with ether to give a solid. The solid is suspended in ethanol (10 ml), cooled to 0°, then treated dropwise with tosyl azide (0.97 g). The reaction is stirred for 3 hrs, concentrated, dissolved in 1N sodium hydroxide and extracted with ether. The ether is washed with water, dried with sodium sulfate and concentrated to give the title compound. cooled to 0° overnight at 22° The precipitate is filtered washed well with ether to give a solid cooled to 0° The reaction is stirred for 3 hrs concentrated dissolved in 1N sodium hydroxide extracted with ether The ether is washed with water dried with sodium sulfate concentrated

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

Procedure: An ethereal solution of diazomethane is prepared from n-methyl-n-nitro-n-nitroso guanidine (15.72 g) for an estimated yield of 64 mmol. To the ethereal solution (400 ml) at 0° is added triethylamine (9.0 ml, 64 mmol), then dropwise benzoyl chloride (7.4 ml, 64 mmol). The reaction is warmed to 22° and stirred for 20 hrs, then filtered through celite and concentrated. The residue is recrystallized from ether/pentane to give the title compound. The reaction is warmed to 22° filtered through celite concentrated The residue is recrystallized from ether/pentane