Selective Acylation of Aryl- and Heteroarylmagnesium Reagents with Esters in Continuous Flow
作者:Benjamin Heinz、Dimitrije Djukanovic、Maximilian A. Ganiek、Benjamin Martin、Berthold Schenkel、Paul Knochel
DOI:10.1021/acs.orglett.9b04254
日期:2020.1.17
A selectiveacylation of readily accessible organomagnesium reagents with commercially available esters proceeds at convenient temperatures and short residence times in continuous flow. Flow conditions allow us to prevent premature collapse of the hemiacetal intermediates despite noncryogenic conditions, thus furnishing ketones in good yields. Throughout, the coordinating ability of the ester and/or
photoinduced acylation of N‐heterocycles is explored. This visible‐lighttriggered reaction occurs not only under extremely mild reaction conditions, but also does not require the presence of a photosensitizer. The mechanistic studies suggest formation of EDA complexes prompt to harness the energy from visible‐light. Compatibility with a large panel of α‐keto acids as acyl precursors and an array of N‐heterocycles
Deoxygenative α-alkylation and α-arylation of 1,2-dicarbonyls
作者:Shengfei Jin、Hang T. Dang、Graham C. Haug、Viet D. Nguyen、Hadi D. Arman、Oleg V. Larionov
DOI:10.1039/d0sc03118f
日期:——
challenging but synthetically indispensable approach to α-branched carbonyl motifs that are widely represented among drugs, natural products, and synthetic intermediates. Here, we describe a simple approach to generation of boron enolates in the absence of strong bases that allows for introduction of both α-alkyl and α-aryl groups in a reaction of readily accessible 1,2-dicarbonyls and organoboranes. Obviation
Synthesis and Evaluation of Structurally Diverse C-2-Substituted Thienopyrimidine-Based Inhibitors of the Human Geranylgeranyl Pyrophosphate Synthase
作者:Hiu-Fung Lee、Cyrus M. Lacbay、Rebecca Boutin、Alexios N. Matralis、Jaeok Park、Daniel D. Waller、Tian Lai Guan、Michael Sebag、Youla S. Tsantrizos
DOI:10.1021/acs.jmedchem.1c01913
日期:2022.2.10
Novel analogues of C-2-substituted thienopyrimidine-based bisphosphonates (C2-ThP-BPs) are described that are potent inhibitors of the human geranylgeranyl pyrophosphate synthase (hGGPPS). Members of this class of compounds induce target-selective apoptosis of multiple myeloma (MM) cells and exhibit antimyeloma activity in vivo. A key structural element of these inhibitors is a linker moiety that connects
描述了基于 C-2-取代的噻吩并嘧啶的双膦酸盐 (C2-ThP-BP) 的新型类似物,它们是人香叶基香叶基焦磷酸合酶 (hGGPPS) 的有效抑制剂。此类化合物的成员可诱导多发性骨髓瘤 (MM) 细胞的靶点选择性凋亡,并在体内表现出抗骨髓瘤活性。这些抑制剂的关键结构元件是将其(((2-苯基噻吩并[2,3- d ]嘧啶-4-基)氨基)亚甲基)双膦酸核心连接到各种侧链的连接体部分。研究人员对该连接体部分的结构多样性以及与其相连的侧链进行了研究,发现其显着影响这些化合物在 MM 细胞中的毒性。确定的最有效的抑制剂分别在小鼠和大鼠中进行了肝毒性和全身暴露的评估,这为此类化合物作为人类治疗的潜在价值提供了进一步的乐观。
.alpha.,.alpha.-Difluoroarylacetic acids: preparation from (diethylamino)sulfur trifluoride and .alpha.-oxoarylacetates