Chemoselective palladium-catalyzed α-allylation of α-boryl aldehydes
作者:Jeffrey D. St. Denis、Zhi He、Andrei K. Yudin
DOI:10.1039/c2ob26503f
日期:——
Herein we report the development of an α-allylation reaction of α-boryl aldehydes that preserves the carbonâboron bond under Pd0/PdII catalysis. A variety of α-boryl aldehydes and allylic alcohols participate in this chemoselective transformation. The α-allylated products were obtained as single regioisomers.
Boron-Containing Enamine and Enamide Linchpins in the Synthesis of Nitrogen Heterocycles
作者:Jeffrey D. St. Denis、Adam Zajdlik、Joanne Tan、Piera Trinchera、C. Frank Lee、Zhi He、Shinya Adachi、Andrei K. Yudin
DOI:10.1021/ja510963k
日期:2014.12.17
access to the corresponding α-halo aldehydes, which undergo regioselective annulation to form borylated thiazoles. A condensation/amidationsequence converts α-boryl aldehydes into stable α-boryl enamides without concomitant C → N migration. We also show that palladium-catalyzed cyclization of α-boryl enamides leads to synthetically versatile isoindolones. These molecules can be subsequently used to access
已经证明了 α-硼烯胺和烯酰胺在氮杂环合成中的使用。硼烯胺可以很容易地获得相应的 α-卤代醛,这些醛经过区域选择性环化形成硼化噻唑。缩合/酰胺化序列将 α-硼醛转化为稳定的 α-硼烯酰胺,而不会伴随 C → N 迁移。我们还表明,钯催化的 α-硼烯酰胺环化导致合成通用的异吲哚酮。这些分子随后可用于访问多环支架。
Pd-Catalyzed coupling of benzyl bromides with BMIDA-substituted <i>N</i>-tosylhydrazones: synthesis of <i>trans</i>-alkenyl MIDA boronates
作者:Shichao Li、Muyao Li、Shu-Sen Li、Jianbo Wang
DOI:10.1039/d1cc06170d
日期:——
A palladium-catalyzed stereoselective synthesis of alkenyl boronates from N-methyliminodiacetyl boronate (BMIDA)-substituted N-tosylhydrazone and benzyl bromides is developed. A range of trans-alkenyl MIDA boronates as single stereoisomers were obtained in moderate yields with good functional group compatibility. The resultant boronate products may be transformed to other boron-containing compounds
Access to Cyclic Amino Boronates via Rhodium-Catalyzed Functionalization of Alkyl MIDA Boronates
作者:Jeffrey D. St. Denis、C. Frank Lee、Andrei K. Yudin
DOI:10.1021/acs.orglett.5b02861
日期:2015.12.4
sulfamate esters derived from amphoteric α-boryl aldehydes. Depending on the substitution pattern of the boryl sulfamate ester, a diverse range of five- or six-membered ring heterocycles are accessible using this transformation. The highly chemoselective nature of the C–H functionalization reaction preserves the alkyl boronate functional group, which enables the synthesis of B–C–N and B–C–C–N motifs
Synthesis of Aminoboronic Acid Derivatives from Amines and Amphoteric Boryl Carbonyl Compounds
作者:Diego B. Diaz、Conor C. G. Scully、Sean K. Liew、Shinya Adachi、Piera Trinchera、Jeffrey D. St. Denis、Andrei K. Yudin
DOI:10.1002/anie.201605754
日期:2016.10.4
Herein, we demonstrate the use of α‐boryl aldehydes and acyl boronates in the synthesis of aminoboronic acid derivatives. This work highlights the untapped potential of boron‐substituted iminium ions and offers insights into the behavior of N‐methyliminodiacetyl (MIDA) boronates during condensation and tautomerization processes. The preparative value of this contribution lies in the demonstration that