Efficient Synthesis of B-Iododialkyl- and B-Alkyldiiodoboranes as Their Acetonitrile Complexes: Application for the Enolboration–Aldolization of Ethyl Ketones
作者:P. Veeraraghavan Ramachandran、Mu-Fa Zou、Herbert C. Brown
DOI:10.1002/1522-2675(200210)85:10<3027::aid-hlca3027>3.0.co;2-h
日期:2002.10
MeCN complexes from the corresponding chloro- and bromoboranes by treatment with NaI or KI in MeCN. In the presence of EtN(i-Pr)2, the B-(cyclohexyldiiodo)borane-acetonitrile complex converts ethyl ketones exclusively to the (Z)-enolates, which, upon aldolization with a series of aldehydes, provide the corresponding syn-aldols exclusively in high yields.
通过在 MeCN 中用 NaI 或 KI 处理,一系列 B-(碘二烷基)硼烷和 B-(烷基二碘)硼烷已容易地从相应的氯代和溴代硼烷合成为 MeCN 配合物。在 EtN(i-Pr)2 存在下,B-(环己基二碘代)硼烷-乙腈络合物将乙基酮仅转化为 (Z)-烯醇化物,后者在与一系列醛醛缩合后提供相应的顺醛醇只在高产。