Abstract
We report an efficient method for the preparation of aryllithium and zinc reagents
from inexpensive and readily available aryl chlorides by using lithium 4,4′-di-tert-butylbiphenylide (LiDBB) as a lithiation reagent. The resulting organometallic reagents
underwent subsequent reactions with a variety of electrophiles, such as an aldehydes,
DMF, PhSSO2Ph, TsCN, an aryl halide, or an acid chloride (through Pd-catalyzed cross-coupling).
Aryl chlorides bearing substituents, including methoxy, 3,4-methylenedioxy, fluoride,
TMS, OTMS, NMe2, acetal, and ketal, were shown to be appropriate substrates. Interestingly, aryl
chlorides containing a formyl group could also be used, provided that the formyl group
was temporarily converted into an α-amino alkoxide by using the lithium amide of N,N,N′-trimethylethylenediamine (LiTMDA). The presence of a hydroxyl group was also tolerated
when it was deprotonated with n-BuLi prior to the addition of LiDBB.
Key words
organolithium reagents - aryllithium - arylzinc - palladium - cross-coupling