The title asymmetric synthesis has been developed by featuring bromolactonization of (−)-acetals, derived from 2-acetyl-3,4-dihydronaphthacene-6,11-diones and (2R,3R)-(+)-N,N,N′,N′-tetraalkyltartaric acid diamides, as a key diastereoselective reaction. The produced bromolactone mixtures could be readily converted to the highly opticallyactive key synthetic intermediates of 4-demethoxy- and 11-deo
Regiospecific approaches to 6-deoxyanthracyclinones, which have resulted in the synthesis of the novel anthracyclines 4-demethoxy-6-deoxydaunorubicin (2) and 6-deoxycarminomycin (3), are reported. The construction of the aglycone 4 is based on the coupling of l,4-dimethoxy-2-lithionaphthalene (10) to 1 formyl-2-carbomethoxy-4-acetylcyclohexane thioketal (11). A new improved regioselective route, which
Novel aminonaphthacene derivatives and process for preparation thereof
申请人:Sumitomo Chemical Company, Limited
公开号:US04545936A1
公开(公告)日:1985-10-08
An aminonaphthacene derivative of the formula: ##STR1## wherein R.sup.1 is a hydrogen atom, a hydroxyl group or a lower alkoxy group, R.sup.2 is a hydrogen atom or a hydroxyl group, R.sup.3 is a hydrogen atom or a lower alkanoyl group and R.sup.4 and R.sup.5 are, same or different, each a hydrogen atom, a lower alkyl group, a lower hydroxyalkyl group or a group of the formula: ##STR2## wherein A is an alkylene group which may have one or more lower alkyl substituent(s) and R.sup.6 and R.sup.7 are, same or different, each a hydrogen atom, a lower alkyl group, a lower hydroxyalkyl group or a lower aminoalkyl group, and an acid addition salt thereof, which is useful as anti-tumor agent.