borane-THF in tetrahydrofuran T=0°C; 1 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

1: Chloro-acetic acid (1R,2S)-1-(toluene-4-sulfonylamino)-indan-2-yl ester With titanium tetrachloride; N-ethyl-N,N-diisopropylamine in dichloromethane T=0°C; 2: α-benzyloxypropionaldehyde With titanium tetrachloride in dichloromethane T=-78°C; 0.5 h;

chromium(VI) oxide in pyridine; acetic acid T=23°C; 3 h; Yield given;

zinc dibromide in diethyl ether T=0°C; Title compound not separated from byproducts;

1.) Et2O, -10 - -5 deg C, 40 min, 2.) -78 deg C, 1 h; -78 deg C to 20 deg C, 3 h; Yield given. Multistep reaction. Yields of byproduct given;

in dichloromethane T=-60°C; NMR observation of chelate intermediates, deuterium labelling study; Mechanism;