Regioselective construction of diverse and multifunctionalized 2-hydroxybenzophenones for sun protection by indium(<scp>iii</scp>)-catalyzed benzannulation
作者:Hongyun Cai、Likai Xia、Yong Rok Lee
DOI:10.1039/c6cc02381a
日期:——
Highly regioselective synthesis of 2-hydroxybenzophenones via the In(OTf)3-catalyzed formal [2+2+2] and [4+2] benzannulations has been successfully developed and their application as sun protection materials was also evaluated.
Domino Reaction to Functionalized 2-Hydroxybenzophenones from Electron-Deficient Chromones and 1,3-Dicarbonyl Compounds
作者:Hong Chen、Fuchun Xie、Jian Gong、Youhong Hu
DOI:10.1021/jo201384f
日期:2011.10.21
A base-promoted one-pot tandemreaction sequence has been developed to transform electron-deficient chromone-fused dienes 1 and 1,3-dicarbonylcompounds 2 to functionalized 2-hydroxybenzophenones 3 under mild conditions. This domino process, which involves multiple reactions, including Michael addition/cyclization/elimination, serves as an efficient, economic, and eco-friendly method for the construction
Asymmetric Michaelreaction of 3-homoacyl coumarins and chromone-fused dienes was developed by employing a chiral squaramide, and a series of coumarin chromone skeletons were furnished in moderate to high yields (up to 99%) and stereoselectivities (up to 98 : 2 dr, 99% ee).
An Efficient Approach to Functionalized Benzo[<i>a</i>]xanthones through Reactions of 2-Methyl-3-(1-alkynyl)chromones with Electron-Deficient Chromone-Fused Dienes
作者:Jian Gong、Fuchun Xie、Hong Chen、Youhong Hu
DOI:10.1021/ol101496w
日期:2010.9.3
An efficienttandem process was developed to synthesize diversified benzo[a]xanthones from 2-methyl-3-(1-alkynyl)chromones with electron-deficient chromone-fused dienes. This unusual reaction, involving multiple steps and not requiring the use of transition metal catalysts or an inert atmosphere, results in the formation of three new C−C bonds and one C−O bond.
开发了一种有效的串联方法,以从2-甲基-3-(1-炔基)色酮与电子不足的色酮稠合二烯合成多种苯并[ a ]氧杂蒽。这种不寻常的反应涉及多个步骤,不需要使用过渡金属催化剂或惰性气氛,导致形成三个新的C-C键和一个C-O键。
NHC-Catalyzed Cascade Reaction between β-Methyl Enals and Dienones for Quick Construction of Complex Multicyclic Lactones
作者:Jun Sun、Jun Xu、Guihua Nie、Zhichao Jin、Yonggui Robin Chi
DOI:10.1021/acs.orglett.0c00533
日期:2020.4.3
A NHC-promoted cascade reactionbetween β-methyl enal and dienone is developed for quick access to multicyclic lactone molecules bearing quaternary chiral carbon centers. Our study constitutes the first 1,6-addition of the acylazolium vinyl enolate γ-carbon via NHC catalysis and provides rapid access to complex lactone molecules that are otherwise difficult to prepare. The structurally sophisticated