On the paradox of TiCl4 reducing power: pinacol coupling and two-carbon homologation of carbonyl compounds
作者:Angelo Clerici、Nadia Pastori、Ombretta Porta
DOI:10.1016/j.tetlet.2004.01.025
日期:2004.2
TiCl4/DIPEA/CH2Cl2 reducing systempromotes pinacol coupling and/or reduction to alcohol of aromaticaldehydes and carbonyl compounds activated towards reduction by an electron withdrawing group. In addition, bis homologation of these substrates is observed. An inner-sphere electron transfer from TiCl4 to DIPEA accounts for the products distribution.