Benzotriazole-assisted β-lithiation of vinyl ethers
摘要:
Benzotriazole-assisted beta-deprotonation of (alpha-benzotriazolylvinyl) ethers occurs stereoselectively at the cis position as shown by quenching with a variety of electrophiles. Semiempirical calculations of the lithiated enol ethers by PM3 and MNDO methods disclosed a higher stabilization for the cis-isomers over the corresponding trans-isomers.