| 中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 | 
|---|---|---|---|---|
| —— | 5-(2'-chloroprop-2'-enyloxy)-2-methyl-6,11-dihydroanthra<1,2-b>furan-6,11-dione | 80034-86-2 | C20H13ClO4 | 352.774 | 
| —— | 5-hydroxy-2-methyl-6,11-dioxo-6,11-dihydroanthra<1,2-b>furan-3-carboxylic acid | 86841-99-8 | C18H10O6 | 322.274 | 
| —— | ethyl 5-hydroxy-2-methyl-6,11-dioxo-6,11-dihydroanthra<1,2-b>furan-3-carboxylate | 79958-67-1 | C20H14O6 | 350.328 | 
| —— | 2,5-dimethyl-7,12-dihydroanthra[1,2-b:4,3-b']difuran-7,12-dione | 72183-83-6 | C20H12O4 | 316.313 | 
| —— | ethyl 5-methoxy-2-methyl-6,11-dioxo-6,11-dihydroanthra<1,2-b>furan-3-carboxylate | 38445-14-6 | C21H16O6 | 364.354 | 
| 中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 | 
|---|---|---|---|---|
| —— | 5-hydroxy-2-methyl-6,11-dioxo-6,11-dihydroanthra<1,2-b>furan-4-carbaldehyde | 92978-91-1 | C18H10O5 | 306.274 | 
| —— | 5-benzyloxy-2-methylanthra<1,2-b>furan-6,11-dione | 130514-55-5 | C24H16O4 | 368.389 | 
| —— | 2-methyl-5-(2'-methylprop-2'-enyloxy)-6,11-dihydroanthra<1,2-b>furan-6,11-dione | 84736-02-7 | C21H16O4 | 332.356 | 
| —— | 5-(2'-chloroprop-2'-enyloxy)-2-methyl-6,11-dihydroanthra<1,2-b>furan-6,11-dione | 80034-86-2 | C20H13ClO4 | 352.774 | 
| —— | 5-hydroxy-2-methyl-4-(2'-methylprop-2'-enyl)-6,11-dihydroanthra<1,2-b>furan-6,11-dione | 84736-04-9 | C21H16O4 | 332.356 | 
| —— | 4-(2-chloro-allyl)-5-hydroxy-2-methyl-anthra[1,2-b]furan-6,11-dione | 72183-82-5 | C20H13ClO4 | 352.774 | 
| —— | 2,5-dimethyl-7,12-dihydroanthra[1,2-b:4,3-b']difuran-7,12-dione | 72183-83-6 | C20H12O4 | 316.313 | 
| —— | 5-methoxy-2-methyl-4-(2'-oxopropyl)-6,11-dihydroanthra<1,2-b>furan-6,11-dione | 92978-89-7 | C21H16O5 | 348.355 | 
| —— | 5-methoxy-2-methyl-4-(2'-methylprop-2'-enyl)-6,11-dihydroanthra<1,2-b>furan-6,11-dione | 92978-88-6 | C22H18O4 | 346.383 | 
An efficient and rapid method is described for the reductive Claisen rearrangement of different propargyloxyanthraquinones to anthra[1,2-b]furan-6,11-diones for first time using iron powder in a mixture of two ionic liquids, namely 1-methylimidazolium tetrafluoroborate [Hmim]BF4 and 1-benzyl-3-methylimidazolium chloride [Bzmim]Cl. The present method is able to execute single or double Claisen rearrangements of 1,4- or 1,5-bispropargyloxyanthraquinones selectively, so that the desired anthra(mono)furandiones or anthra(bis)furandiones are produced, respectively, as the major product.
A reinvestigation of the reductive Claisen rearrangement of the bis(allyloxy)anthraquinones (1) and (2) with sodium dithionite of high quality has afforded new compounds. These include inter alia diastereomeric pairs of doubly rearranged leuco 1,4-dihydroxyanthraquinones in the diketo form [(14) and (16); (15) and (17)], products derived from attack on or rearrangement to a quinone carbonyl group, e.g. (28) and (29), and in the case of (1) a 10-deoxygenated 1,4-anthraquinone (21). Structures have been assigned from two-dimensional n.m.r. experiments.