p-Toluenesulfonic acid → HCID 57262708, compound

Participants

Reaction Steps

To a solution of 17-ethyl-1,14-dihydroxy-12-[2'-(4"-(1-t-butyldimethylsilyloxyethylindol-5-yl)oxy-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 (0.38 gm) in CH2Cl2 (10 ml) at room temperature was added a solution of paratoluene sulfonic acid (0.05 gm) in CH3OH (10 ml). The reaction mixture was stirred for 3 hours until TLC (silica, 2:1, hexanes:ethyl acetate) verified that reaction was complete. The reaction mixture was poured into saturated NaHCO3 and extracted twice with CH2Cl2. The combined organic extracts were dried over Na2SO4, filtered and concentrated in vacuo. The crude product was purified by chromatography (silica, 2:1 hexanes:ethyl acetate) to provide the title compound 0.245 gm. MASS (FAB) M+Li 957. Partial 1H NMR (CDCl3, 200 MHz) δ:7.18 (d, J=10 Hz, 1H); 7.16 (bs, 1H); 7.06 (d, J=4 Hz, 1H); 6.86 (dd, J=3 Hz and 10 Hz, 1H); 6.33 (d, J=4 Hz, 1H); 4.13 (t, J=6.7 Hz, 2H); 3.83 (t, J=6.7 Hz, 2H); 3.43 (s, 3H).

Provenance & Evidence