A New Synthesis of α-Phenylhomoallylnitriles from β-Nitrostyrene and Allylic Silanes
作者:Hidemitsu Uno、Satomi Fujiki、Hitomi Suzuki
DOI:10.1246/bcsj.59.1267
日期:1986.4
TiCl4-catalyzed addition of allylic silanes to β-nitrostyrene affords γ,δ-unsaturated nitronates which, on treatment with low valent titanium in situ generated from Ti(IV) and zinc, are smoothly converted to γ,δ-unsaturated nitriles in moderate yields.
UNO HIDEMITSU, BULL. CHEM. SOC. JAP., 59,(1986) N 8, 2471-2479
作者:UNO HIDEMITSU
DOI:——
日期:——
Regioselective Carboxylation of Silicon-Stabilized Allylic Carbanions and the Synthetic Utility of 2-Silyl-3-butenoates
作者:Hidemitsu Uno
DOI:10.1246/bcsj.59.2471
日期:1986.8
Carbanions of allylic dimethylphenylsilanes show remarkable regioselectivity toward both carboxylation with carbon dioxide and methylation with methyl iodide. Methylation of these compounds occurred preferentialy at α position, although allyltrimethylsilane and allyltriphenylsilane are known to give γ selectivity toward the same electrophiles. Moreover, their aluminum “ate” complexes react with carbon
烯丙基二甲基苯基硅烷的碳负离子对二氧化碳的羧化和甲基碘的甲基化都显示出显着的区域选择性。这些化合物的甲基化优先发生在 α 位,尽管已知烯丙基三甲基硅烷和烯丙基三苯基硅烷对相同的亲电试剂具有 γ 选择性。此外,它们的铝“ate”复合物在 a 位置与二氧化碳发生区域选择性反应,而与烯丙基部分的甲基取代模式无关。α-羧化烯丙基硅烷被证明是酯化后 3-(甲氧基羰基)烯丙基阴离子的有用合成子。