中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 1-hydroxy-2-(prop-2'-enyl)-4-(prop-2'-enyloxy)-9,10-anthraquinone | 79207-98-0 | C20H16O4 | 320.345 |
1,4-二羟基蒽醌 | 1,4-dihydroxy-9,10-anthracenedione | 81-64-1 | C14H8O4 | 240.215 |
—— | 1,4-bis(prop-2'-enyloxy)-9,10-anthraquinone | 79207-97-9 | C20H16O4 | 320.345 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 1,4-dihydro-5,12-dihydroxynaphthacene-6,11-dione | 58976-87-7 | C18H12O4 | 292.291 |
—— | 2,3-diallyl-1,4-dimethoxyanthraquinone | 170024-88-1 | C22H20O4 | 348.398 |
—— | 5,12-diacetoxy-1,4-dihydronaphthacene-6,11-dione | 58976-90-2 | C22H16O6 | 376.365 |
2,3-Bisalkynyl anthraquinones have been synthesized and their behaviour under Bergman-type cyclization conditions has been studied. Cyclization reactions of 2,3-bis(propenyl)anthraquinones yield a number of products, mechanisms for the formation of which are proposed. An attempt to elaborate an A-ring from the 2,3-allyl side chains of the bisallylated anthraquinone (32) is reported.
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.
The Claisen rearrangements of 1,4-bis(prop-2'-enyloxy)anthraquinone (4) and 1,4-bis(2'-chloroprop- 2'-enyloxy)anthraquinone (3) in o-dichlorobenzene have been examined. The former gives a low yield of 1,4-dihydroxy-2,3-bis(prop-2'-enyl)anthraquinone (22), and 1,4-dihydroxy-2-(prop-2'-eny1)- anthraquinone (5) as the major product. Also formed is 1-hydroxy-4-propanoyl-2-(prop-2'-enyl)- anthraquinone (6) which arises from an unprecedented rearrangement of one allyloxy group. 1,4-Bis(2?-chloroprop-2'-enyloxy)anthraquinone (3) gives mainly 2-(2'-chloroprop-2'-enyl)-4-(2'- chloroprop-2'-enyloxy)-1-hydroxyanthraquinone (11) and a variety of minor products which are dependent on the time of reaction. Treatment of compound (11) with ethanolic potassium hydroxide, followed by a further Claisen rearrangement, gives a high yield of the synthetically useful 4-(2'-chloro-prop-2'-enyl)-5-hydroxy-2-methyl-6,11-dihydroanthra[1,2-b]furan-6,11-dione (19).