in ethanol; acetic acid 0.75 h; Heating;

1: 93 percent / triethylamine / dimethylformamide / 4 h / Ambient temperature 2: sodium borohydride, lithium bromide / bis-(2-methoxy-ethyl) ether / 1.)25 degC, 7 h, 2.) 0 degC overnight, 3.) 25 degC 5 h 3: 90 percent / ethanol; acetic acid / 0.75 h / Heating View Scheme

1: sodium borohydride, lithium bromide / bis-(2-methoxy-ethyl) ether / 1.)25 degC, 7 h, 2.) 0 degC overnight, 3.) 25 degC 5 h 2: 90 percent / ethanol; acetic acid / 0.75 h / Heating View Scheme