Single and double reductive cleavage of CO bonds of aromatic dimethyl acetals and ketals: Generation of benzylic mono- and dicarbanions
作者:Ugo Azzena、Giovanni Melloni、Luisa Pisano、Barbara Sechi
DOI:10.1016/s0040-4039(00)73488-5
日期:1994.9
The reductive cleavage of aromatic dimethyl acetals and ketals, 1, with Li metal in THF at low temperature allows the generation of stable α-alkoxy-α-arylsubstituted carbanions, avoiding the Wittig rearrangement. Reaction of these carbanions with various electrophiles afforded the expected products 2. Further in situ reaction of compounds 2 afforded the products of reductive electrophilic disubstitution
在低温下用四氢呋喃中的锂金属对芳族二甲基乙缩醛和缩酮1进行还原性裂解,可生成稳定的α-烷氧基-α-芳基取代的碳负离子,从而避免了Wittig重排。这些碳负离子与各种亲电试剂的反应提供了预期的产物2。进一步原位化合物的反应2得到的还原电双取代,的产品3。