Researchers who often do experiments know that organic synthesis is a process of preparing more complex target molecules from simple raw materials through one or more chemical reactions. Generally, it requires fewer steps, and cheap raw materials. 205383-87-5, name is tert-Butyl 2-oxospiro[indoline-3,3′-pyrrolidine]-1′-carboxylate, A new synthetic method of this compound is introduced below., HPLC of Formula: C16H20N2O3
Researchers who often do experiments know that organic synthesis is a process of preparing more complex target molecules from simple raw materials through one or more chemical reactions. Generally, it requires fewer steps, and cheap raw materials. 205383-87-5, name is tert-Butyl 2-oxospiro[indoline-3,3′-pyrrolidine]-1′-carboxylate, A new synthetic method of this compound is introduced below., HPLC of Formula: C16H20N2O3
Tert-butyl 2-oxospiro[indoline-3,3?-pyrrolidine]-1?-carboxylate (1 g, 3.4 mmol) was added to a round bottom flask containing a stir bar and dissolved in acetonitrile (15 mL). Potassium carbonate (940 mg, 6.8 mmol) was added, followed by 4-bromo-1-(bromomethyl)-2-fluorobenzene (929 mg, 3.4 mmol). The mixture was stirred at room temperature overnight, and then evaporated under reduced pressure. The resulting residue was partitioned between water and ethyl acetate. The organic layer was collected, and the water layer was extracted with an additional ethyl acetate (2×50 mL). The organic layers were combined, dried over magnesium sulfate, and evaporated to afford a colorless solid, which was used directly in the next step. To a microwave vial containing a stir bar was added tert-butyl 1-(4-bromo-2-fluorobenzyl)-2-oxospiro[indoline-3,3?-pyrrolidine]-1?-carboxylate (457 mg, 0.96 mmol), followed by 1-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (200 mg, 0.96 mmol), cesium carbonate (626 mg, 1.9 mmol), 1,1?-bis(diphenylphosphino)ferrocene]-dichloropalladium (II) dichloromethane adduct (78 mg, 0.096 mmol), and the mixture was suspended in THF/water (4 mL, 1:1). The vial was sealed, and the mixture was heated to 160 C. for 10 min. The organic layer was removed, filtered through celite and evaporated to afford an oil, which was re-dissolved in excess TFA. This solution was allowed to stir at room temperature for 2 h, and then TFA was evaporated under reduced pressure. The resulting oil was used directly in the next step. 1-(2-fluoro-4-(1-methyl-1H-pyrazol-4-yl)benzyl)spiro[indoline-3,3?-pyrrolidin]-2-one (75 mg, 0.2 mmol) was added to a vial containing a stir bar and dissolved in DMF (1 mL). Potassium carbonate (41 mg, 0.3 mmol) was added, followed by iodomethane (15 muL, 0.2 mmol). The vial was sealed, and the mixture was stirred at room temperature for 2 h. The suspension was filtered to remove solids, and then purified using an SCX cartridge to afford the title compound as a clear oil. LCMS: RT=0.59 min, >99% (at) 254 nm, >99% (at) 215 nm; m/z (M+1)+=391. 1H NMR (400 MHz, CDCl3, delta (ppm)): 7.7 (s, 1H), 7.6 (s, 1H), 7.5 (dd, J=7.4, 0.6 Hz, 1H), 7.3-7.1 (m, 4H), 7.1-7.0 (m, 1H), 6.8 (d, J=7.8 Hz, 1H), 5.0 (s, 2H), 4.0 (s, 3H), 3.1-3.0 (m, 1H), 3.0-2.9 (m, 2H), 2.8-2.7 (m, 1H), 2.5 (s, 3H), 2.5-2.4 (m, 1H), 2.1 (dt, J=12.8, 7.7 Hz, 1H), HRMS calculated for C23H24N4OF (M+H)+ m/z: 391.1934, measured: 391.1933.
The basis of chemical reaction formula synthesis, the synthesis route is composed of some specific reactions and combined according to certain logical thinking. We look forward to the emergence of more reaction modes in the future.
Reference:
Patent; VANDERBILT UNIVERSITY; Lindsley, Craig W.; Conn, P. Jeffrey; Wood, Michael R.; Hopkins, Corey R.; Melancon, Bruce J.; Poslusney, Michael S.; US2013/123236; (2013); A1;,
Indoline – Wikipedia,
Indoline | C8H9N – PubChem