中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 7-chloro-1,3,6-trihydroxy-8-methyl-9H-xanthen-9-one | 67065-98-9 | C14H9ClO5 | 292.675 |
—— | 2,7-dichloro-6-O-methylnorlichenxanthone | 141861-64-5 | C15H10Cl2O5 | 341.147 |
—— | 6-benzyloxy-7-chloro-1,3-dihydroxy-8-methyl-9H-xanthen-9-one | 131524-53-3 | C21H15ClO5 | 382.8 |
—— | 7-chloro-1,3,6-trihydroxy-8-methyl-9-oxo-9H-xanthen-2-carboxylic acid | 131524-54-4 | C15H9ClO7 | 336.685 |
—— | benzyl 6-benzyloxy-7-chloro-1,3-dihydroxy-8-methyl-9-oxo-9H-xanthen-2-carboxylate | 131524-51-1 | C29H21ClO7 | 516.935 |
—— | benzyl 6-benzyloxy-4,7-dichloro-1,3-dihydroxy-8-methyl-9-oxo-9H-xanthen-2-carboxylate | 131524-52-2 | C29H20Cl2O7 | 551.38 |
A new synthetic route to norlichexanthone (1,3,6-trihydroxy-8-methyl- 9H-xanthen-9-one) derivatives has been developed by using a Smiles rearrangement of an appropriately substituted depside in the key step. 2,4,7-Trichloronorlichexanthone (22) and 4,5,7- trichloronorlichexanthone (29) have been prepared by this method. The former xanthone (22) was shown to be a constituent of the lichens Lecanora sulphurata and L. flavo-pallescens and the latter (29) a constituent of Micarea austroternaria var. isabellina.