[DE] NEUE ANTIMIKROBIELLE CHROMAN-4-ONE<br/>[EN] NOVEL ANTIMICROBIAL CHROMAN-4-ONES<br/>[FR] NOUVELLES CHROMAN-4-ONES ANTIMICROBIENNES
申请人:UNIV ERNST MORITZ ARNDT
公开号:WO2004113317A1
公开(公告)日:2004-12-29
Die Erfindung betrifft unter anderem neue Chroman-4-one der allgemeinen Formel (I) Verfahren zur Herstellung derselben sowie deren Verwendung als antimikrobielle Wirkstoffe.
Reactions of 4-[(tert-butyldimethylsilyl)oxy]-1-benzopyrylium triflates (2a-c) with silyl enol ethers (3a-d) or allyl organometallic reagents (5a-c) afforded the corresponding 2-substituted 4-siloxy-2H-1-benzopyrans (4a-d and 6a-d) along with 2,3-dihydrobenzopyrone derivatives (7a-c). An unexpected cyclopentane annulation to give 8a,b was observed in the reaction of 2a,b with 3-(trimethylsilyl)-1-butene (5d). Treatment of the products (4a and 6a) with electrophiles (iminium salt, NBS, and NCS) converted them into the corresponding 2,3-disubstituted 2,3-dihydrobenzopyrone derivatives (9a-c). Reaction of benzopyrylium salts (2a,b) with alpha,beta-unsaturated ketones (10a-g) in the presence of tert-butyldimethylsilyl triflate and 2,6-lutidine gave cyclohexene annulation products (xanthone derivatives, 11a-j) in moderate to high yield. The reaction mechanisms are explained in terms of stereoelectronic and 1,3-allylic strain effects together with steric hindrance during the reaction.
OHKATA, KATSUO;ISHIMARU, KENJI;LEE, YONG-GYUN;AKIBA, KIN-YA, CHEM. LETT.,(1990) N, C. 1725-1728