| 摘要 |
Disclosed are a process and novel compounds useful for preparing compounds of formula (A) wherein R1 and R2 independently represent hydrogen, inorganic or optionally substituted organic substituents; R3 is hydrogen, or an optionally substituted organic group; and R4 and R5 are as defined herein, the process comprising (a) converting a dibenzocycloheptene into a 5-hydroxyaminodibenzocycloheptene; (b) converting the 5-hydroxyaminodibenzocycloheptene into a 12-hydroxy-10,11-dihydrodibenzocycloheptene; and (c) removing the 12-hydroxy group to yield a 10,11-dihydro-dibenzocycloheptene. |
