Palladium-Catalyzed Cross-Coupling of Superbase-Generated C(sp<sup>3</sup>) Nucleophiles
作者:Garrett P. R. Freure、Eric A. Skrotzki、Jean-Danick E. Lavertu、Stephen G. Newman
DOI:10.1021/acscatal.1c03180
日期:2021.10.1
C–H bonds. Conditions are developed with either n-BuLi/diamine or n-BuLi/KOtBu superbases to enable metalation to occur with high selectivity. Organolithium nucleophiles can be directly used in cross-coupling, or organozincs can be formed to enable reactions with functional group-dense organohalides.
最近研究了一系列用于弱酸性 C(sp 3 )-H 键芳基化的方法,主要利用过渡金属催化剂的定向金属化或通过氢原子转移形成自由基。在这项工作中,一个经典的碱介导的方法是采取,利用有机金属超强碱金属化到非常弱的酸性(对的能力ķ一> 40)C-H键。使用n -BuLi/二胺或n -BuLi/KO t Bu 超碱开发的条件能够以高选择性发生金属化。有机锂亲核试剂可以直接用于交叉偶联,或者可以形成有机锌以与官能团密集的有机卤化物反应。
One‐Step Synthesis of Arylacetaldehydes from Aryl Aldehydes or Diaryl Ketones via One‐Carbon Extension by Using the System of DMSO/KOH/Zinc
A one-step protocol is described for the synthesis of arylacetaldehydes from aryl aldehydes or diaryl ketones by using the system of DMSO/KOH/zinc. In this transformation, DMSO provides a methine fragment that converts the −CHO structure in aryl aldehydes or the −CO− structure in diaryl ketones to the −CH2CHO structure in arylacetaldehydes via a one-carbon extension. This protocol could also be used