and efficient synthesis has been developed for 1,2,4-traizole derivatives from 2-arylidene-1,3-indandiones and 1-methylhydrazine-1-carbonitrile in two steps with good yields. The reactions include formal [3 + 2] cycloaddition and skeletal rearrangement to provide amino hydrazones followed by T3P mediated dehydrogenative coupling. This method provides a new and useful strategy for synthesis of novel 1
Construction of dispirocyclohexanes via amine-catalyzed [2 + 2 + 2] annulations of Morita–Baylis–Hillman acetates with exocyclic alkenes
作者:Rongshun Chen、Silong Xu、Xia Fan、Hanyuan Li、Yuhai Tang、Zhengjie He
DOI:10.1039/c4ob01927j
日期:——
Amine-catalyzed [2 + 2 + 2] annulations of one molecule of Morita–Baylis–Hillman (MBH) acetates 1 with two molecules of 2-(arylmethylidene)indane-1,3-diones 2 or methyleneindolinones 4 have been developed under very mild conditions, which produce multistereogenic dispirocyclohexanes 3 and 5, respectively, in moderate to excellent yields and good diastereoselectivity. This amine-catalyzed annulation constitutes
Synthesis of dibenzo[<i>a</i>,<i>d</i>]cycloheptanoids <i>via</i> aryne insertion into 2-arylidene-1,3-indandiones
作者:Nagaraju Payili、Santhosh Reddy Rekula、Anjaiah Aitha、V. V. S. R. N. Anji Karun Mutha、Challa Gangu Naidu、Satyanarayana Yennam
DOI:10.1039/c9ob01900f
日期:——
A novel and unexpected aryne insertion cascade reaction on 2-arylidene-1,3-indandiones via conjugate addition of fluoride followed by formal C-C insertion is developed to afford dibenzo[a,d]cycloheptanoid derivatives in good yields with a single isomer. This reaction represents a rare instance of cyclic enone C-C bond insertion (acyl-alkenylation) in aryne chemistry. Interestingly, 2-arylidene-1,3-indandiones
Catalytic asymmetric Tamura cycloaddition of homophthalic anhydrides with 2-arylidene-1,3-diones
作者:Han Xu、Feng Sha、Qiong Li、Xin-Yan Wu
DOI:10.1039/c8ob01970c
日期:——
An organocatalytic enantioselective Tamuracycloaddition between homophthalic anhydrides and 2-arylidene-1,3-indanediones has been developed. With 2 mol% of commercially available (DHQD)2PYR, a wide range of enantioenriched spiro-1,3-indanedione derivatives were obtained in good-to-excellent yields (68–98%), excellent diastereoselectivities (99 : 1 dr) and moderate-to-excellent enantioselectivities
Multicomponent All-Carbon Cascade and Sequential Annulation: Construction of Functionalized Decalins
作者:Yuan Zhong、Guichen Li、Dan Zhang、Long Hao、Zhengjun Cai
DOI:10.1021/acs.orglett.3c01379
日期:2023.6.9
decalin derivatives. The reaction strategy consisted of a consecutive Michael/Michael/tautomerization/Michael/Aldol annulation sequence and involved organic amine catalysts, mild conditions, and high stereoselectivity. This strategy, using a one-pot approach, resulted in the construction of four C–C bonds and the formation of fused carbocyclic decalin derivatives.