中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 3-(1'',2''-dihydroxypropyl)-1-methoxy-2-(2'-methylprop-2'-enyl)anthraquinone | 254896-12-3 | C22H22O5 | 366.414 |
—— | 3-formyl-1-methoxy-2-(2'-methylprop-2'-enyl)anthraquinone | 254896-13-4 | C20H16O4 | 320.345 |
—— | 1-methoxy-2-(2'-methylprop-2'-enyl)-3-(prop-1''-enyl)anthraquinone | 254896-11-2 | C22H20O3 | 332.399 |
—— | 1-hydroxy-2-(2'-methylprop-2'-enyl)-3-(prop-1''-enyl)anthraquinone | 254896-10-1 | C21H18O3 | 318.372 |
—— | 4-hydroxy-1-methoxy-2-(prop-1'-enyl)anthraquinone | 126308-21-2 | C18H14O4 | 294.307 |
—— | (E)-1-methoxy-4-(2''-methylprop-2''-enyloxy)-2-(prop-1'-enyl)anthraquinone | 254896-06-5 | C22H20O4 | 348.398 |
The methylidene tetracycle (2) has been synthesized in 11 steps from quinizarin (5) in an overall yield of 38% by using a highly ecient selective dihydroxylation step and an intramolecular ene cyclization. Also prepared with the selective dihydroxylation methodology were the silyloxy alkene (3) and the 6-demethoxy alkene (4). A mixture (1 : 2) of the (E)- and (Z)-isomers of the ethylidene compound (6) has been prepared by similar methods. The products resulting from the reactions of AD-mix-α and AD-mix-β on the alkenes (1)–(3) and (6) have been investigated and their stereochemistries assigned by using 1 H n.m.r. and NOESY experiments, and molecular modelling of acetonide derivatives. An X-ray crystal structure of the acetate (64) has confirmed the relative stereochemical assignments.