2-aminoethyl ditert-butyl phosphate

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

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 amine 226 (203 mg, 0.80 mmol) and Et3N (0.11 mL, 0.80 mmol) in THF (2 mL) was added to solution of 116 (306 mg, 0.67 mmol) in THF (8 mL) at 0° C. After 5 min the cooling bath was removed and after 10 min Cs2CO3 (0.44 g, 1.3 mmol) and MeOH (4 mL) were added. After a further 25 min the mixture was diluted with water and extracted with CH2C2 (×3). The combined extracts were dried and evaporated and the residue was purified by chromatography, eluting with EtOAc/petroleum ether (1:1 then 2:1) to give di(tert-butyl) 2-({[1-(chloromethyl)-5-nitro-1,2-dihydro-3H-benzo[e]indol-7-yl]sulfonyl}amino)ethyl phosphate (227) (351 mg, 91%) as a red-orange foam: 1H NMR [(CD3)2SO] δ 8.59 (d, J=1.6 Hz, 1H), 8.04 (d, J=8.9 Hz, 1H), 7.95 (br s, 1H, 7.79 (dd, J=8.9, 1.8 Hz, 1H, 7.77 (s, 1H), 6.74 (s, 1H), 4.28-4.20 (m, 1H), 3.95-3.86 (m, 2H), 3.83-3.72 (m, 4H), 2.99 (t, J=6.0 Hz, 2H), 1.35 (s, 18H). HMS (FAB) calcd. for C23H3335ClN3O8PS (M+) m/z 577.1415, found 577.1412. were added extracted with CH2C2 (×3) The combined extracts were dried evaporated the residue was purified by chromatography eluting with EtOAc/petroleum ether (1:1

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

Procedure: A solution of amine 226 (203 mg, 0.80 mmol) and Et3N (0.11 mL, 0.80 mmol) in THF (2 mL) was added to solution of 116 (306 mg, 0.67 mmol) in THF (8 mL) at 0° C. After 5 min the cooling bath was removed and after 10 min Cs2CO3 (0.44 g, 1.3 mmol) and MeOH (4 mL) were added. After a further 25 min the mixture was diluted with water and extracted with CH2C2 (×3). The combined extracts were dried and evaporated and the residue was purified by chromatography, eluting with EtOAc/petroleum ether (1:1 then 2:1) to give di(tert-butyl) 2-({[1-(chloromethyl)-5-nitro-1,2-dihydro-3H-benzo[e]indol-7-yl]sulfonyl}amino)ethyl phosphate (227) (351 mg, 91%) as a red-orange foam: 1H NMR [(CD3)2SO] δ 8.59 (d, J=1.6 Hz, 1H), 8.04 (d, J=8.9 Hz, 1H), 7.95 (br s, 1H, 7.79 (dd, J=8.9, 1.8 Hz, 1H, 7.77 (s, 1H), 6.74 (s, 1H), 4.28-4.20 (m, 1H), 3.95-3.86 (m, 2H), 3.83-3.72 (m, 4H), 2.99 (t, J=6.0 Hz, 2H), 1.35 (s, 18H). HMS (FAB) calcd. for C23H3335ClN3O8PS (M+) m/z 577.1415, found 577.1412. were added extracted with CH2C2 (×3) The combined extracts were dried evaporated the residue was purified by chromatography eluting with EtOAc/petroleum ether (1:1

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

Procedure: A solution of 225 (1.17 g, 3.02 mmol) in MeOH (30 mL) with Pd/C (5%, 0.21 g) was hydrogenated at 50 psi for 2.5 h. The mixture was filtered through Celite, washing with MeOH, and the filtrate was evaporated. The residue was dissolved in CH2Cl and the solution was filtered once more, then evaporated to give 2-aminoethyl di(tert-butyl) phosphate (226) (604 mg, 79%) as a colourless oil: 1H NMR [CDCl3] δ 4.01-3.94 (m, 2H), 2.96-2.90 (m, 2H), 1.58 (br s, 2H), 1.49 (s, 18H). HRMS (FAB) calcd. for C10H25NO4P (MH+) m/z 254.1521, found 254.1519. The mixture was filtered through Celite washing with MeOH the filtrate was evaporated The residue was dissolved in CH2Cl the solution was filtered once more evaporated