(E)-4-[cyclobutyl(methyl)amino]but-2-enoic acid;hydrochloride

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

Procedure: To a cooled solution of (R)-3-iodo-1-(pyrrolidin-3-yl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine (4) (990 mg, 3.0 mmol), (E)-4-(cyclobutyl(methyl)amino)but-2-enoic acid (21) (871 mg, 3.0 mmol) and DIPEA (3.1 mL, 18 mmol) in DMF (15 mL) was added HBTU (1.74 g, 4.5 mmol). The resulting solution was stirred at RT overnight, then quenched with water. The layers were separated and the aqueous layer was extracted with 85% DCM/IPA(3×). The combined organic phase was dried over Na2SO4, filtered and concentrated. The residue was purified by flash chromatography to provided (R,E)-1-(3-(4-amino-3-iodo-1H-pyrazolo[3,4-d]pyrimidin-1-yl)pyrrolidin-1-yl)-4-(cyclobutyl(methyl)amino)but-2-en-1-one (22) (1.71 g, quant. yield) as a white solid. LC-MS (ESI): m/z (M+1) 482.0. quenched with water The layers were separated the aqueous layer was extracted with 85% DCM/IPA(3×) The combined organic phase was dried over Na2SO4 filtered concentrated The residue was purified by flash chromatography

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

Procedure: To a solution of (E)-methyl 4-(cyclobutyl(methyl)amino)but-2-enoate (20) (1.47 g, 8 mmol) in THF/H2O (8 mL/2 mL) was added LiOH.H2O (730 mg, 16 mmol). The reaction mixture was stirred at RT overnight, then acidified with 1N HCl to pH=1 and concentrated in vacuum to afford (E)-4-(cyclobutyl(methyl)amino)but-2-enoic acid hydrochloride salt (21) (2.31 g, 97%, mixed with LiCl) as a white solid which was used in the next step without purification. LC-MS (ESI): m/z (M+1) 170.2. concentrated in vacuum

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

Procedure: To a cooled solution of (R)-3-iodo-1-(pyrrolidin-3-yl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine (4) (990 mg, 3.0 mmol), (E)-4-(cyclobutyl(methyl)amino)but-2-enoic acid (21) (871 mg, 3.0 mmol) and DIPEA (3.1 mL, 18 mmol) in DMF (15 mL) was added HBTU (1.74 g, 4.5 mmol). The resulting solution was stirred at RT overnight, then quenched with water. The layers were separated and the aqueous layer was extracted with 85% DCM/IPA(3×). The combined organic phase was dried over Na2SO4, filtered and concentrated. The residue was purified by flash chromatography to provided (R,E)-1-(3-(4-amino-3-iodo-1H-pyrazolo[3,4-d]pyrimidin-1-yl)pyrrolidin-1-yl)-4-(cyclobutyl(methyl)amino)but-2-en-1-one (22) (1.71 g, quant. yield) as a white solid. LC-MS (ESI): m/z (M+1) 482.0. quenched with water The layers were separated the aqueous layer was extracted with 85% DCM/IPA(3×) The combined organic phase was dried over Na2SO4 filtered concentrated The residue was purified by flash chromatography

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

Procedure: To a cooled solution of (R)-3-iodo-1-(pyrrolidin-3-yl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine (4) (990 mg, 3.0 mmol), (E)-4-(cyclobutyl(methyl)amino)but-2-enoic acid (21) (871 mg, 3.0 mmol) and DIPEA (3.1 mL, 18 mmol) in DMF (15 mL) was added HBTU (1.74 g, 4.5 mmol). The resulting solution was stirred at RT overnight, then quenched with water. The layers were separated and the aqueous layer was extracted with 85% DCM/IPA(3×). The combined organic phase was dried over Na2SO4, filtered and concentrated. The residue was purified by flash chromatography to provided (R,E)-1-(3-(4-amino-3-iodo-1H-pyrazolo[3,4-d]pyrimidin-1-yl)pyrrolidin-1-yl)-4-(cyclobutyl(methyl)amino)but-2-en-1-one (22) (1.71 g, quant. yield) as a white solid. LC-MS (ESI): m/z (M+1) 482.0. quenched with water The layers were separated the aqueous layer was extracted with 85% DCM/IPA(3×) The combined organic phase was dried over Na2SO4 filtered concentrated The residue was purified by flash chromatography

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

Procedure: To a solution of (E)-methyl 4-(cyclobutyl(methyl)amino)but-2-enoate (20) (1.47 g, 8 mmol) in THF/H2O (8 mL/2 mL) was added LiOH.H2O (730 mg, 16 mmol). The reaction mixture was stirred at RT overnight, then acidified with 1N HCl to pH=1 and concentrated in vacum to afford (E)-4-(cyclobutyl(methyl)amino)but-2-enoic acid hydrochloride salt (21) (2.31 g, 97%, mixed with LiCl) as a white solid which was used in the next step without purification. LC-MS (ESI): m/z (M+1) 170.2. concentrated in vacum

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

Procedure: To a cooled solution of (R)-3-iodo-1-(pyrrolidin-3-yl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine (4) (990 mg, 3.0 mmol), (E)-4-(cyclobutyl(methyl)amino)but-2-enoic acid (21) (871 mg, 3.0 mmol) and DIPEA (3.1 mL, 18 mmol) in DMF (15 mL) was added HBTU (1.74 g, 4.5 mmol). The resulting solution was stirred at RT overnight, then quenched with water. The layers were separated and the aqueous layer was extracted with 85% DCM/IPA(3×). The combined organic phase was dried over Na2SO4, filtered and concentrated. The residue was purified by flash chromatography to provided (R,E)-1-(3-(4-amino-3-iodo-1H-pyrazolo[3,4-d]pyrimidin-1-yl)pyrrolidin-1-yl)-4-(cyclobutyl(methyl)amino)but-2-en-1-one (22) (1.71 g, quant. yield) as a white solid. LC-MS (ESI): m/z (M+1) 482.0. quenched with water The layers were separated the aqueous layer was extracted with 85% DCM/IPA(3×) The combined organic phase was dried over Na2SO4 filtered concentrated The residue was purified by flash chromatography

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

Procedure: To a solution of (E)-methyl 4-(cyclobutyl(methyl)amino)but-2-enoate (20) (1.47 g, 8 mmol) in THF/H2O (8 mL/2 mL) was added LiOH.H2O (730 mg, 16 mmol). The reaction mixture was stirred at RT overnight, then acidified with 1N HCl to pH=1 and concentrated in vacuum to afford (E)-4-(cyclobutyl(methyl)amino)but-2-enoic acid hydrochloride salt (21) (2.31 g, 97%, mixed with LiCl) as a white solid which was used in the next step without purification. LC-MS (ESI): m/z (M+1) 170.2. concentrated in vacuum

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

Procedure: To a solution of (E)-methyl 4-(cyclobutyl(methyl)amino)but-2-enoate (20) (1.47 g, 8 mmol) in THF/H2O (8 mL/2 mL) was added LiOH.H2O (730 mg, 16 mmol). The reaction mixture was stirred at RT overnight, then acidified with 1N HCl to pH=1 and concentrated in vacuum to afford (E)-4-(cyclobutyl(methyl)amino)but-2-enoic acid hydrochloride salt (21) (2.31 g, 97%, mixed with LiCl) as a white solid which was used in the next step without purification. LC-MS (ESI): m/z (M+1) 170.2. concentrated in vacuum

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

Procedure: To a solution of 4a (134 mg, 0.344 mmol), (E)-4-(cyclobutyl(methyl)amino)but-2-enoic acid hydrochloride (0.344 mmol) and HATU (122 mg, 0.38 mmol) in DMF (1.5 ml) was dropwise added DIPEA (134 mg, 1.032 mmol) at rt. Stirring was continued for 30 min at rt (monitored by HPLC). The reaction mixture was diluted with EA, washed with water and brine, and dried over sodium sulfate. Filtration followed by concentration under reduced pressure provided a residue which was purified by flash chromatography using silica gel (1-12% MeOH/DCM) to give 32 mg of the title compound (4b). MS (ESI) m/e (M+1H)+: 542.1. at rt washed with water and brine dried over sodium sulfate Filtration followed by concentration under reduced pressure provided a residue which was purified by flash chromatography

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

Procedure: To a solution of 4a (134 mg, 0.344 mmol), (E)-4-(cyclobutyl(methyl)amino)but-2-enoic acid hydrochloride (0.344 mmol) and HATU (122 mg, 0.38 mmol) in DMF (1.5 ml) was dropwise added DIPEA (134 mg, 1.032 mmol) at rt. Stirring was continued for 30 min at rt (monitored by HPLC). The reaction mixture was diluted with EA, washed with water and brine, and dried over sodium sulfate. Filtration followed by concentration under reduced pressure provided a residue which was purified by flash chromatography using silica gel (1-12% MeOH/DCM) to give 32 mg of the title compound (4b). MS (ESI) m/e (M+1H)+: 542.1. at rt washed with water and brine dried over sodium sulfate Filtration followed by concentration under reduced pressure provided a residue which was purified by flash chromatography

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

Procedure: To a solution of 4a (134 mg, 0.344 mmol), (E)-4-(cyclobutyl(methyl)amino)but-2-enoic acid hydrochloride (0.344 mmol) and HATU (122 mg, 0.38 mmol) in DMF (1.5 ml) was dropwise added DIPEA (134 mg, 1.032 mmol) at rt. Stirring was continued for 30 min at rt (monitored by HPLC). The reaction mixture was diluted with EA, washed with water and brine, and dried over sodium sulfate. Filtration followed by concentration under reduced pressure provided a residue which was purified by flash chromatography using silica gel (1-12% MeOH/DCM) to give 32 mg of the title compound (4b). MS (ESI) m/e (M+1H)+: 542.1. at rt washed with water and brine dried over sodium sulfate Filtration followed by concentration under reduced pressure provided a residue which was purified by flash chromatography

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

Procedure: In mixture of (R)-6-amino-7-(4-phenoxyphenyl)-9-(pyrrolidin-3-yl)-7H-purin-8(9H)-one (62) (95 mg, 0.24 mmol), (E)-4-(cyclobutyl(methyl)amino)but-2-enoic acid hydrochloride (76 mg, 0.37 mmol) and DIPEA (213 μL, 1.2 mmol) in 5 mL dry DMF was cooled to 0° C., HBTU (190 mg, 0.49 mmol) was added in one portion. The reaction mixture was allowed to warm up to rt, and stirred for 2 hrs under N2, and purified directly by preparative-HPLC (RP C18, 10 to 95% acetonitrile in water (0.2% NH3.H2O)) to give (R,E)-6-amino-9-(1-(4-(cyclobutyl(methyl)amino)but-2-enoyl)pyrrolidin-3-yl)-7-(4-phenoxyphenyl)-7H-purin-8(9H)-one (64) (36 mg, 25.9%) as a light yellow solid. LC-MS (ESI): m/z (M/M+2) 518/520. 1H NMR (400 MHz, DMSO) δ 8.11 (d, J=6.0 Hz, 1H), 7.48-7.36 (m, 4H), 7.23-7.07 (m, 5H), 6.69-6.55 (m, 1H), 6.34 (dd, J=35.9, 15.1 Hz, 1H), 5.89-5.67 (m, 2H), 5.18-4.95 (m, 1H), 4.15-3.42 (m, 4H), 2.97 (dd, J=18.6, 6.2 Hz, 2H), 2.85-2.73 (m, 1H), 2.73-2.58 (m, 1H), 2.33-2.10 (m, 1H), 1.98 (d, J=12.6 Hz, 3H), 1.95-1.87 (m, 2H), 1.80-1.67 (m, 2H), 1.63-1.48 (m, 2H). to warm up to rt purified directly by preparative-HPLC (RP C18, 10 to 95% acetonitrile in water (0.2% NH3.H2O))