Efficient and Green Syntheses of 12-Aryl-2,3,4,12-tetrahydrobenzo[b]xanthene-1,6,11-triones in Water and Task-Specific Ionic Liquid

Insight into and Computational Studies of the Selective Synthesis of 6H-Dibenzo[b,h]xanthenes

“…31,32 Several procedures have been described for the preparation of type 1 xanthenes (Figure 1), most of them based on a two-or three-component reaction of β-naphthol with aldehydes. [33][34][35][36][37][38][39][40][41][42][43][44] When 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 naphthoquinones are fused to the xanthenes, two sub-classes of products may be produced, which have also been prepared by several synthetic methods ( Figure 1): benzoxanthenes with one naphthoquinone moiety, represented by compound 2 and its isomer 3 and compound 4 and its isomer 5, [45][46][47][48][49][50][51][52] and dibenzoxanthenes with two naphthoquinone moieties attached to the central pyran ring, which can have 3 possible isomers 6, 7 and 8. Tisseh e...…”

Design, synthesis, and catalytic performance of modified graphene oxide based on a cobalt complex as a heterogenous catalyst for the preparation of aminonaphthoquinone derivatives

“…30 2-Hydroxy-1,4-napthoquinone (lawsone) has been known for almost 4000 years, which is present in the leaves of the henna plant, and it is a signicant source of natural dyes. 31 The compounds containing the naphthoquinone structure received a great deal of attention because of various biological features such as molluscicidal, 32 antitumor, 33 antifungal, and antibacterial 34 activities as well as uorescence behavior. 35 Research shows that the incorporation of nitrogen atom containing functional groups such as amino group or nitrogen atom into the naphthoquinone framework oen improves anticancer, 36 molluscicidal, 37 and antibacterial activities.…”

Design and characterization of Dendrimer of MNPs as a novel, heterogeneous and reusable nanomagnetic organometallic catalyst for one‐pot synthesis of hydroxyl naphthalene‐1,4‐dione derivatives under solvent‐free conditions

“…2‐Hydroxy‐1,4‐napthoquinone (HNQ) has been known for the past 4000 years, is principal natural dye in the leaves of henna . Today, semipermanents hair dyes containing henna as well as its pure dye ingredient HNQ are extensively used and have become increasingly popular because of their natural origin .…”

“…[25] 2-Hydroxy-1,4-napthoquinone (HNQ) has been known for the past 4000 years, is principal natural dye in the leaves of henna. [26] Today, semipermanents hair dyes containing henna as well as its pure dye ingredient HNQ are extensively used and have become increasingly popular because of their natural origin. [27] Moreover, molecules containing the hetrocyclic quinone group constitute an important class in organic chemistry because of their various biological activities (such as antitumor, antibacterial and anti-inflammatory agents), industrial applications, and potential as intermediates in the synthesis of hetrocycles.…”

“…[27] Moreover, molecules containing the hetrocyclic quinone group constitute an important class in organic chemistry because of their various biological activities (such as antitumor, antibacterial and anti-inflammatory agents), industrial applications, and potential as intermediates in the synthesis of hetrocycles. [26] Herein, we described a method for synthesis of a novel dendrimer super acidic magnetic nanoparticles catalyst (Scheme 1). We used this dendrimer super acidic magnetic nanoparticles as catalyst for the one-pot synthesis of 2-hydroxy-1,4-naphthoquinone derivatives from 2hydroxynaphthalene-1,4-dione, aromatic aldehydes and hetrocyclic amines under solvent free conditions (Scheme 2).…”