An unprecedented copper(II) trifluoromethanesulfonate‐catalyzed [4+2] cascade annulation of propargylic alcohols with benzo[d]isoxazoles proceeds through a sequential ring opening/Meyer–Schuster rearrangement/intermolecular cyclization. This protocol, which tolerates a broad variety of functional groups, offers a versatile, modular and atom‐economical access to a new class of fascinating quinoline
前所未有的三氟甲磺酸铜(II)催化的炔丙醇与苯并[ d ]异恶唑的级联环化反应通过顺序开环/ Meyer-Schuster重排/分子间环化来进行。该方案可耐受多种官能团,在温和条件下以高收率提供了一种通用的,模块化的,原子经济的途径来获得新型迷人的喹啉衍生物。转换可以有效地放大到克级,从而突出了此方法的综合效用。
[3 + 2]-Cycloaddition of Azaoxyallyl Cations with 1,2-Benzisoxazoles: A Rapid Entry to Oxazolines
作者:Juan Feng、Ming Zhao、Xuanzi Lin
DOI:10.1021/acs.joc.9b01166
日期:2019.8.2
novel and efficient [3 + 2] cycloaddition reaction of azaoxyallyl cations and 1,2-benzisoxazoles to give oxazoline derivatives has been developed. The transformation provides a rapid entry to functionalized oxazoline scaffolds under mild and transition-metal-free conditions, which will greatly expand the reaction types of heterocycle chemistry and pave the way for syntheses of bioactivecompounds.
Ring opening [3 + 2] cyclization of azaoxyallyl cations with benzo[d]isoxazoles: Efficient access to 2-hydroxyaryl-oxazolines
作者:Yicheng He、Chao Pi、Yangjie Wu、Xiuling Cui
DOI:10.1016/j.cclet.2019.09.025
日期:2020.2
Abstract A selective ring-opening [3 + 2] cyclization reaction of benzo[d]isoxazoles with 2-bromo-propanamides has been developed. The azaoxyallyl cation intermediates are employed as C∼O 3-atom synthon to build oxa-heterocycles via the selectivity of suitable cyclization partners. This transformation provides rapid access to highly functionalized 2-hydroxyaryl-oxazolines under mild conditions and
Stereoselective Synthesis of (Z)-Allyl Alcohols through Coinage-Metal-Catalyzed Nucleophilic Addition of Benzo[d]isoxazoles with Unactivated Propargyl Alcohols
作者:Zhiyuan Chen、Wenjin Wu、Tiantian Zheng、Jie Tan、Shouzhi Pu
DOI:10.1055/s-0037-1611828
日期:2019.7
The Au/Ag-cocatalyzed stereoselective addition reaction of cyanophenol anion species generated in situ with unactivated propargyl alcohols to produce functionalized (Z)-allylalcohols in mostly good yields is reported. Benzo[d]isoxazoles were found to be excellent building blocks for the production of highly reactive cyanophenol anions from Kemp elimination reactions, thus serving as a masked benzonitrile
Indoles having aryloxyalkanoic acid substituents or arylalkanoic acid substituents are agonists or partial agonists of PPAR gamma and are useful in the treatment and control of hyperglycemia that is symptomatic of type II diabetes, as well as dyslipidemia, hyperlipidemia, hypercholesterolemia, hypertriglyceridemia, and obesity that are often associated with type 2 diabetes.