α-Lithiation of dihydrofuran, benzofuran, and dihydropyran followed by treatment with various organolithiums stereoselectively produces in good yields the corresponding ring-opened (E)-alkenyllithiums, i.e., (E)-β(or γ)-hydroxy-ω-alkenyl-ω-lithioalkenes, the lithium atom of which can be readily replaced with H, D, or C groups, such as CO2 and Me.
二氢
呋喃,
苯并呋喃和二氢
吡喃的α-
锂基化反应,然后用各种
有机锂进行立体选择,可以产生高收率的相应开环的(E)-烯基
锂,即(E)-β(或γ)-羟基-ω-烯基- ω-
硫代烯烃,其
锂原子可以很容易地被H,D或C基团(例如CO 2和Me)取代。