对映体富集的S-烯丙基N-单烷基单硫代氨基甲酸酯的质子化提供了相应的手性锂化合物。发现α-硫代烯丙基锂化合物9和25在-78℃下在THF溶液中是构型稳定的。这些代表第一构型稳定的α-硫代取代的烯丙基锂化合物,它们可用于不对称合成中。烷基化以立体反转或抗-S E '过程进行,而羰基化合物的添加以顺-S E '过程进行。羟烷基化产物用作Ni 0的起始原料-催化的交叉偶联反应。
Palladium(0)-Catalyzed Enantioselective <i>O</i>,<i>S</i>-Rearrangement of Racemic <i>O</i>-Allylic Thiocarbamates: A New Entry to Enantioenriched Allylic Sulfur Compounds
作者:Hans-Joachim Gais、Achim Böhme
DOI:10.1021/jo010668b
日期:2002.2.1
operation from the corresponding N-methyl S-allylic thiocarbamate through a palladium(0)-catalyzed substitution of iodobenzene in the presence of a base. The palladium(0)-catalyzed enantioselective rearrangement of O-allylic carbamates to S-allylic carbamates has been extended from the solution phase to the solid phase by using a methyl thioisocyanate polystyrene resin. In the case investigated the enantioselectivity
The Synthesis and Configurational Stability of Enantioenriched α-Thioallyllithium Compounds and the Stereochemical Course of Their Electrophilic Substitution
chiral lithium compounds. The α-thioallyllithium compounds 9 and 25 were found to be configurationally stable in THF solutions at −78 °C. These represent the first configurationally stable α-thio-substituted allyllithium compounds, and they can be utilized in asymmetric synthesis. Alkylations proceeded with stereoinversion or in an anti-SE′ process, while addition to carbonyl compounds took place in
对映体富集的S-烯丙基N-单烷基单硫代氨基甲酸酯的质子化提供了相应的手性锂化合物。发现α-硫代烯丙基锂化合物9和25在-78℃下在THF溶液中是构型稳定的。这些代表第一构型稳定的α-硫代取代的烯丙基锂化合物,它们可用于不对称合成中。烷基化以立体反转或抗-S E '过程进行,而羰基化合物的添加以顺-S E '过程进行。羟烷基化产物用作Ni 0的起始原料-催化的交叉偶联反应。