2-BROMOCYCLOPENT-2-ENOL

反应条件: temp:0.00; pressure:0.00; stir:

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

实验步骤: 2-Bromo-cyclopent-2-enol (Intermediate D3) (2.18 g, 13.4 mmol) and N,N-dimethylacetamide dimethyl acetal (3.5 mL, 21.5 mmol) in m-xylene (˜20 mL) were heated to 140° C. for 14 h. The mixture was freed of solvent and the residue was purified on a column of silica gel with 30% to 50% EtOAc:hexanes to give 2-(2-bromo-cyclopent-2-enyl)-N,N-dimethyl-acetamide (Intermediate FOUR1) 1.95 g (63%) as a brown oil. the residue was purified on a column of silica gel with 30% to 50% EtOAc

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

实验步骤: A solution of 2-bromo-cyclopent-2-enol (Intermediate D3) (21.7 g, 133.1 mmol) in ethyl vinyl ether (300 mL) was treated with Hg(OAc)2 (31.8 g, 99 mmol) at rt for 60 h. The mixture was quenched with 5% NaOH (150 mL) and filtered through celite. The residue was concentrated to yield 1-bromo-5-vinyloxy-cyclopentene as a pale yellow oil, 14.2 g (46%). 1-Bromo-5-vinyloxy-cyclopentene (14.1 g, 74.4 mmol) in toluene was heated in a re-sealable tube at 130° C. for 24 h. (2-Bromo-cyclopent-2-enyl)-acetaldehyde (Intermediate ONE1) was isolated after flash chromatography on silica gel with hexanes to 5% ethyl acetate:hexanes, 10.4 g (74%). The mixture was quenched with 5% NaOH (150 mL) filtered through celite The residue was concentrated

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

实验步骤: The alcohol (Intermediate D3, 16 mmol) in THF (30 mL) at 0° C. was treated with isobutyl magnesium bromide (40 mmol). The catalyst, 1,3-bis(diphenylphosphino)propane nickel (II) chloride (0.75 mmol) (NiCl2dppp) was added in one portion and the mixture was heated to reflux for 3 h. (see: Organ et al. J. Org. Chem. 1997, 62,41523, incorporated herein by reference). The reaction mixture was cooled to rt and quenched with sat. NH4Cl solution. The mixture was filtered and partitioned between brine and diethyl ether. The organic layer was removed and dried over Na2SO4, filtered and concentrated under vacuum. The oil was purified by chromatography on SiO2 with 20% EtOAc:Hx to yield 2-isobutyl-cyclopent-2-enol (Intermediate D4). Use of 2-isobutyl-cyclopent-2-enol (Intermediate D4) in Method A produced 4-(2-isobutyl-cyclopent-2-enylmethyl)-1,3-dihydro-imidazole-2-thione (Compound 20). the mixture was heated to reflux for 3 h. ( quenched with sat. NH4Cl solution The mixture was filtered partitioned between brine and diethyl ether The organic layer was removed dried over Na2SO4 filtered concentrated under vacuum The oil was purified by chromatography on SiO2 with 20% EtOAc

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

实验步骤: 2-Bromo-cyclopent-2-enol (Intermediate D3) (2.18 g, 13.4 mmol) and N,N-dimethylacetamide dimethyl acetal (3.5 mL, 21.5 mmol) in m-xylene (˜20 mL) were heated to 140° C. for 14 h. The mixture was freed of solvent and the residue was purified on a column of silica gel with 30% to 50% EtOAc:hexanes to give 2-(2-bromo-cyclopent-2-enyl)-N,N-dimethyl-acetamide (Intermediate FOUR1) 1.95 g (63%) as a brown oil. the residue was purified on a column of silica gel with 30% to 50% EtOAc

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

实验步骤: A solution of 2-bromo-cyclopent-2-enol (Intermediate D3) (21.7 g, 133.1 mmol) in ethyl vinyl ether (300 mL) was treated with Hg(OAc)2 (31.8 g, 99 mmol) at rt for 60 h. The mixture was quenched with 5% NaOH (150 mL) and filtered through celite. The residue was concentrated to yield 1-bromo-5-vinyloxy-cyclopentene as a pale yellow oil, 14.2 g (46%). 1-Bromo-5-vinyloxy-cyclopentene (14.1 g, 74.4 mmol) in toluene was heated in a re-sealable tube at 130° C. for 24 h. (2-Bromo-cyclopent-2-enyl)-acetaldehyde (Intermediate ONE1) was isolated after flash chromatography on silica gel with hexanes to 5% ethyl acetate:hexanes, 10.4 g (74%). The mixture was quenched with 5% NaOH (150 mL) filtered through celite The residue was concentrated

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

实验步骤: The alcohol (Intermediate D3, 16 mmol) in THF (30 mL) at 0 EC was treated with isobutyl magnesium bromide (40 mmol). The catalyst, 1,3-bis(diphenylphosphino)propane nickel (II) chloride (0.75 mmol) (NiCl2dppp) was added in one portion and the mixture was heated to reflux for 3 h. (see: Organ et al. J. Org. Chem. 1997, 62, 1523, incorporated herein by reference). The reaction mixture was cooled to rt and quenched with sat. NH4Cl solution. The mixture was filtered and partitioned between brine and diethyl ether. The organic layer was removed and dried over Na2SO4, filtered and concentrated under vacuum. The oil was purified by chromatography on SiO2 with 20% EtOAc:Hx to yield 2-isobutyl-cyclopent-2-enol (Intermediate D4). Use of 2-isobutyl-cyclopent-2-enol (Intermediate D4) in Method A produced 4-(2-isobutyl-cyclopent-2-enylmethyl)-1,3-dihydro-imidazole-2-thione (Compound 20). the mixture was heated to reflux for 3 h. ( quenched with sat. NH4Cl solution The mixture was filtered partitioned between brine and diethyl ether The organic layer was removed dried over Na2SO4 filtered concentrated under vacuum The oil was purified by chromatography on SiO2 with 20% EtOAc

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

实验步骤: 2-Bromo-cyclopent-2-enol (Intermediate D3) (2.18 g, 13.4 mmol) and N,N-dimethylacetamide dimethyl acetal (3.5 mL, 21.5 mmol) in m-xylene (˜20 mL) were heated to 140° C. for 14 h. The mixture was freed of solvent and the residue was purified on a column of silica gel with 30% to 50% EtOAc:hexanes to give 2-(2-bromo-cyclopent-2-enyl)-N,N-dimethyl-acetamide (Intermediate FOUR1) 1.95 g (63%) as a brown oil. the residue was purified on a column of silica gel with 30% to 50% EtOAc

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

实验步骤: 2-Bromo-cyclopent-2-enol (Intermediate D3) (2.18 g, 13.4 mmol) and N,N-dimethylacetamide dimethyl acetal (3.5 mL, 21.5 mmol) in m-xylene (˜20 mL) were heated to 140° C. for 14 h. The mixture was freed of solvent and the residue was purified on a column of silica gel with 30% to 50% EtOAc:hexanes to give 2-(2-bromo-cyclopent-2-enyl)-N,N-dimethyl-acetamide (Intermediate FOUR1) 1.95 g (63%) as a brown oil. the residue was purified on a column of silica gel with 30% to 50% EtOAc

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

实验步骤: A solution of 2-bromo-cyclopent-2-enol (Intermediate D3) (21.7 g, 133.1 mmol) in ethyl vinyl ether (300 mL) was treated with Hg(OAc)2 (31.8 g, 99 mmol) at rt for 60 h. The mixture was quenched with 5% NaOH (150 mL) and filtered through celite. The residue was concentrated to yield 1-bromo-5-vinyloxy-cyclopentene as a pale yellow oil, 14.2 g (46%). 1-Bromo-5-vinyloxy-cyclopentene (14.1 g, 74.4 mmol) in toluene was heated in a re-sealable tube at 130° C. for 24 h. (2-Bromo-cyclopent-2-enyl)-acetaldehyde (Intermediate ONE1) was isolated after flash chromatography on silica gel with hexanes to 5% ethyl acetate:hexanes, 10.4 g (74%). The mixture was quenched with 5% NaOH (150 mL) filtered through celite The residue was concentrated

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

实验步骤: The alcohol (Intermediate D3, 16 mmol) in THF (30 mL) at 0° C. was treated with isobutyl magnesium bromide (40 mmol). The catalyst, 1,3-bis(diphenylphosphino)propane nickel (II) chloride (0.75 mmol) (NiCl2dppp) was added in one portion and the mixture was heated to reflux for 3 h. (see: Organ et al. J. Org. Chem. 1997, 62, 1523, incorporated herein by reference). The reaction mixture was cooled to rt and quenched with sat. NH4Cl solution. The mixture was filtered and partitioned between brine and diethyl ether. The organic layer was removed and dried over Na2SO4, filtered and concentrated under vacuum. The oil was purified by chromatography on SiO2 with 20% EtOAc:Hx to yield 2-isobutyl-cyclopent-2-enol (Intermediate D4). Use of 2-isobutyl-cyclopent-2-enol (Intermediate D4) in Method A produced 4-(2-isobutyl-cyclopent-2-enylmethyl)-1,3-dihydro-imidazole-2-thione (Compound 20). the mixture was heated to reflux for 3 h. ( quenched with sat. NH4Cl solution The mixture was filtered partitioned between brine and diethyl ether The organic layer was removed dried over Na2SO4 filtered concentrated under vacuum The oil was purified by chromatography on SiO2 with 20% EtOAc

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

实验步骤: The alcohol (Intermediate D3, 16 mmol) in THF (30 mL) at 0° C. was treated with isobutyl magnesium bromide (40 mmol). The catalyst, 1,3-bis(diphenylphosphino)propane nickel (II) chloride (0.75 mmol) (NiCl2dppp) was added in one portion and the mixture was heated to reflux for 3 h. (see: Organ et al. J. Org. Chem. 1997, 62, 1523, incorporated herein by reference). The reaction mixture was cooled to rt and quenched with sat. NH4Cl solution. The mixture was filtered and partitioned between brine and diethyl ether. The organic layer was removed and dried over Na2SO4, filtered and concentrated under vacuum. The oil was purified by chromatography on SiO2 with 20% EtOAc:Hx to yield 2-isobutyl-cyclopent-2-enol (Intermediate D4). Use of 2-isobutyl-cyclopent-2-enol (Intermediate D4) in Method A produced 4-(2-isobutyl-cyclopent-2-enylmethyl)-1,3-dihydro-imidazole-2-thione (Compound 20). the mixture was heated to reflux for 3 h. ( quenched with sat. NH4Cl solution The mixture was filtered partitioned between brine and diethyl ether The organic layer was removed dried over Na2SO4 filtered concentrated under vacuum The oil was purified by chromatography on SiO2 with 20% EtOAc