Benzannulation of isobenzopyryliums with electron-rich alkynes: a modular access to β-functionalized naphthalenes
作者:An Wu、Hui Qian、Wanxiang Zhao、Jianwei Sun
DOI:10.1039/d0sc02502j
日期:——
A substituent-controlled divergent benzannulation provides rapid access to various β-functionalized naphthalenes from electron-rich alkynes.
一个取代基控制的分歧苯环化合物合成方法,能够快速从富电子炔烃中获得各种β-官能化的萘化合物。
Formal [4 + 4]-, [4 + 3]-, and [4 + 2]-cycloaddition reactions of donor–acceptor cyclobutenes, cyclopropenes and siloxyalkynes induced by Brønsted acid catalysis
作者:Haifeng Zheng、Rui Wang、Kan Wang、Daniel Wherritt、Hadi Arman、Michael P. Doyle
DOI:10.1039/d1sc00158b
日期:——
Brønsted acid catalyzed formal [4 + 4]-, [4 + 3]-, and [4 + 2]-cycloadditions of donor–acceptor cyclobutenes, cyclopropenes, and siloxyalkynes with benzopyrylium ions are reported. [4 + 2]-cyclization/deMayo-type ring-extension cascade processes produce highly functionalized benzocyclooctatrienes, benzocycloheptatrienes, and 2-naphthols in good to excellent yields and selectivities. Moreover, the optical
Non-Precious Metals Catalyze Formal [4 + 2] Cycloaddition Reactions of 1,2-Diazines and Siloxyalkynes under Ambient Conditions
作者:Chintan S. Sumaria、Yunus E. Türkmen、Viresh H. Rawal
DOI:10.1021/ol501254h
日期:2014.6.20
Copper(I) and nickel(0) complexes catalyze the formal [4 + 2] cycloaddition reactions of 1,2-diazines and siloxyalkynes, a reaction hitherto best catalyzed by silver salts. These catalysts based on earth abundant metals are not only competent, but the copper catalyst, in particular, promotes cycloadditions of pyrido[2,3-d]pyridazine and pyrido[3,4-d]pyridazine, enabling a new synthesis of quinoline
铜 (I) 和镍 (0) 配合物催化 1,2-二嗪和甲硅烷氧基炔烃的正式 [4 + 2] 环加成反应,该反应迄今为止最好由银盐催化。这些基于富含地球的金属的催化剂不仅有能力,而且铜催化剂,特别是促进吡啶并[2,3- d ]哒嗪和吡啶并[3,4- d ]哒嗪的环加成,使喹啉和异喹啉衍生物,以及环己烯酮与甲硅烷氧基炔烃的正式 [2 + 2] 环加成反应。
Silver-Catalyzed Formal Inverse Electron-Demand Diels–Alder Reaction of 1,2-Diazines and Siloxy Alkynes
作者:Yunus E. Türkmen、Timothy J. Montavon、Sergey A. Kozmin、Viresh H. Rawal
DOI:10.1021/ja302537j
日期:2012.6.6
A highly effective silver-catalyzed formal inverse electron-demand Diels-Alder reaction of 1,2-diazines and siloxyalkynes has been developed. The reactions provide ready access to a wide range of siloxy naphthalenes and anthracenes, which are formed in good to high yields, under mild reaction conditions, using low catalyst loadings.