We have developed an efficient Lewis acid-catalyzed Diels–Alderroute to a series of cis-fused bicyclic ketones bearing quaternary halogenation at the angular position. We have also developed a Diels–Alder-based one-flask method for the regioselective preparation of TBS-protected 6-hydroxy tetralone and 5-hydroxy indanone derivatives.
We report high‐performance I+/H2O2 catalysis for the oxidative or decarboxylative oxidative α‐azidation of carbonyl compounds by using sodium azide under biphasic neutral phase‐transfer conditions. To induce higher reactivity especially for the α‐azidation of 1,3‐dicarbonyl compounds, we designed a structurally compact isoindoline‐derived quaternary ammonium iodide catalyst bearing electron‐withdrawing
我们报告了在双相中性相转移条件下使用叠氮化钠对羰基化合物进行氧化或脱羧氧化α-叠氮化的高性能I + / H 2 O 2催化。为了诱导更高的反应活性,尤其是对于1,3-二羰基化合物的α-叠氮化,我们设计了结构紧凑的异吲哚啉衍生的带有吸电子基团的季碘化铵催化剂。I + / H 2 O 2的非生产性分解途径催化量可以通过使用催化量的自由基捕获剂来抑制。这种氧化偶合耐受各种官能团,可以很容易地应用于结构多样的复杂分子的后期α-叠氮化。此外,我们实现了1,3-二羰基化合物的对映选择性α-叠氮化,这是手性次碘酸盐催化剂与对映选择性分子间氧化偶联的第一个成功实例。
Methyl 3-((6-Methoxy-1,4-dihydroindeno[1,2-<i>c</i>]pyrazol-3-yl)amino)benzoate (GN39482) as a Tubulin Polymerization Inhibitor Identified by MorphoBase and ChemProteoBase Profiling Methods
A series of indenopyrazoles was synthesized from the corresponding indanones arid phenyl isothiocyanates in two steps. Among the compounds synthesized, methyl 3-((6-methoxy-1,4-dihydroindeno[1,2-c]pyrazol-3-yl)amino)benzoate 6m (GN39482) was found to possess a promising antiproliferative activity toward human cancer cells without affecting any antimicrobial and antimalarial activities at 100 nM. Both a methoxy group at R-1 position and a methoxycarbonyl group at R-2 position of the anilinoquinazoline framework are essential for the high cell growth inhibition. Both MorphoBase and ChemProteoBase profiling analyses suggested that compound 6m was classified as a tubulin inhibitor. Indeed, compound 6m inhibited the acetylated tubulin accumulation and the microtubule formation and induced G2/M cell. Cycle arrest in HeLa cells, revealing that a promising aritiproliferative activity of compound 6m toward human cancer cells is probably caused by the tubulin polymerization inhibition.
Rapid Access to Orthogonally Functionalized Naphthalenes: Application to the Total Synthesis of the Anticancer Agent Chartarin
作者:Teresa A. Unzner、Adriana S. Grossmann、Thomas Magauer
DOI:10.1002/anie.201605071
日期:2016.8.8
We report the synthesis of orthogonally functionalized naphthalenes from simple, commercially available indanones in four steps. The developed method proceeds through a two‐step process that features a thermallyinduced fragmentation of a cyclopropane indanone with simultaneous 1,2‐chloride shift. Migration of the chloride substituent occurs in a regioselective manner to preferentially afford the para‐chloronaphthol
Ring Expansion of 1-Indanones to 2-Halo-1-naphthols as an Entry Point to Gilvocarcin Natural Products
作者:Ivica Zamarija、Benjamin J. Marsh、Thomas Magauer
DOI:10.1021/acs.orglett.1c03530
日期:2021.12.3
functional group tolerance, benefits from mild reaction conditions, and enables rapid access to the tetracyclic core of gilvocarcin natural products. The orthogonally functionalized products allow for selective postmodifications as exemplified in the totalsynthesis of defucogilvocarcinM. For the selective oxidation of the chromene, a mild and regioselective oxidation protocol (DDQ and TBHP) was developed
在此,我们描述了 1-茚满酮的两步环扩展以提供 2-氯/溴-1-萘酚(32 个例子)。所开发的方法显示出广泛的官能团耐受性,受益于温和的反应条件,并且能够快速获得吉沃卡星天然产物的四环核心。正交功能化的产品允许选择性后修饰,如 defucogilvocarcin M 的全合成所示。为了选择性氧化色烯,开发了温和的区域选择性氧化方案(DDQ 和 TBHP)。