To a solution of lithium aluminium hydride (0.44 g, 0.011 mol) in diethyl ether (10 mL) was added dropwise at 0° C. solution of 3-[1-(2-{[tert-butyl(dimethyl)silyl]oxy}ethyl)-1H-indol-3-yl]propanoic acid (Intermediate 40; 2 g, 0.011 mol) in ethyl ether (10 mL). The reaction mixture was stirred at room temperature for 45 minutes. Saturated sodium bicarbonate was added into the mixture at 0° C. The organic phase was extracted and the solvent was removed under reduced pressure giving the title compound (3.2 g, 83%), which was used in the next step without further purification.
