Copper-Catalyzed Cross-Coupling of Allylboronic Acids with α-Diazoketones
摘要:
Copper-catalyzed cross-coupling of substituted allylboronic acids with alpha-diazoketones was studied. This allylation reaction is highly regioselective, providing the branched allylic product. The process involves creation of a new C(sp(3))-C(sp(3)) bond by retaining the keto functional group of the alpha-diazoketone precursor.
Palladium-Catalyzed Synthesis and Isolation of Functionalized Allylboronic Acids: Selective, Direct Allylboration of Ketones
作者:Mihai Raducan、Rauful Alam、Kálmán J. Szabó
DOI:10.1002/anie.201207951
日期:2012.12.21
Textbook revision: Allylboronicacids, which are easily prepared from allylic alcohols, react readily and selectively with ketones without Lewis acid catalysts.
Thermolytic Synthesis of Naphthalenes via Intramolecular Cyclocondensation of o-Phenylallylbenzaldehydes
作者:Meng-Yang Chang、Nai-Chen Hsueh
DOI:10.1055/s-0037-1610175
日期:2018.9
refluxing decalin is reported. The facile and easy-to-operate thermolytic rearrangement procedure generates substituted naphthalenes in good to excellent yields. The development of intramolecular carbonyl-ene type cyclocondensation of oxygenated o-phenylallylbenzaldehydes in refluxing decalin is reported. The facile and easy-to-operate thermolytic rearrangement procedure generates substituted naphthalenes
Boroalkyl Group Migration Provides a Versatile Entry into α-Aminoboronic Acid Derivatives
作者:Zhi He、Adam Zajdlik、Jeffrey D. St. Denis、Naila Assem、Andrei K. Yudin
DOI:10.1021/ja304173d
日期:2012.6.20
exemplifying migration of boron-substituted carbon is described. We show that α-boroalkyl groups of transient boroalkyl acyl azide intermediates readily migrate from carbon to nitrogen. This process allows access to a new class of stable molecules, α-boryl isocyanates, from α-borylcarboxylic acid precursors. The methodology facilitates synthesis of a wide range of α-aminoboronic acid derivatives, including
An expeditious route to sterically encumbered nonproteinogenic α-amino acid precursors using allylboronic acids
作者:Samrat Sahu、Ganesh Karan、Lisa Roy、Modhu Sudan Maji
DOI:10.1039/d1sc06259j
日期:——
non-proteinogenic α-amino acid precursors in good yields and diastereoselectivities. Gram-scale synthesis, broad tolerance of functional groups, excellent stereodivergence, post-synthetic modifications, and easy removal of the chiral auxiliary are some of the key highlights. The protocol is applicable to various amino acids and short peptides, resulting in the incorporation of these precursors at the N-terminal
开发了使用烯丙基硼酸对N-叔丁烷亚磺酰基 α-亚氨基酯进行非对映选择性烯丙基化,以获得具有良好收率和非对映选择性的光学活性非蛋白原 α-氨基酸前体。革兰氏规模合成、广泛的官能团耐受性、出色的立体发散性、合成后修饰以及手性助剂的轻松去除是其中的一些关键亮点。该协议适用于各种氨基酸和短肽,导致这些前体在 N 端位置的结合。
Diastereo- and Enantioselective Synthesis of 3-Allyl-3-hydroxyoxindoles via Allylation of Isatins
A highly diastereo- and enantioselective allylation of isatins with 3-substituted allylboronic compounds was achieved by the chiral N,N′-dioxide/Lu(OTf)3 complex. This approach provides an efficient route to useful enantioenriched 3-allyl-3-hydroxyoxindoles with adjacent tetrasubstituted tertiary or tetrasubstituted quaternary stereogenic centers. Density functional theory calculations were performed