Improved Regioselectivity of Lithiation of Methoxybenzaldehydes
作者:Olivier Duval、Roger D. Waigh
DOI:10.1080/00397919108020788
日期:1991.1
Abstract Protection of the aldehyde moiety as a N,N'-diisopropylimidazolidine allows improved preferential lithiation ortho to the methoxy group of 4- methoxybenzaldehyde or in the 4-position of 3-methoxybenzaldehyde. Reaction with a suitable electrophile, such as dimethyldisulphide, gives good yields of 3-substituted-4-methoxybenzaldehydes or moderate yields of 4-substituted-3-methoxybenzaldehydes