dipyridinium dichromate; 4 A molecular sieve in dichloromethane 6 h; Heating;

1: pyridine / 1 h / Ambient temperature 2: imidazole / dimethylformamide / Ambient temperature 3: 95 percent / lithium triethylborohydride / tetrahydrofuran / 0.17 h 4: 57 percent / PDC, 4A molecular sieves / CH2Cl2 / 6 h / Heating View Scheme

1: imidazole / dimethylformamide / Ambient temperature 2: 95 percent / lithium triethylborohydride / tetrahydrofuran / 0.17 h 3: 57 percent / PDC, 4A molecular sieves / CH2Cl2 / 6 h / Heating View Scheme

1: 95 percent / lithium triethylborohydride / tetrahydrofuran / 0.17 h 2: 57 percent / PDC, 4A molecular sieves / CH2Cl2 / 6 h / Heating View Scheme

Multistep reaction.;

1: 83 percent / HMPT / tetrahydrofuran 2: TBAF / tetrahydrofuran 3: Et3N / CH2Cl2 4: LiAlH4 / diethyl ether View Scheme