Synthesis of functionalized chiral carbocyclic cleft molecules complementary to Troger's base derivatives

Marc C. Kimber, Andrew C. Try, Leoni Painter, Margaret M. Harding*, Peter Turner

*Corresponding author for this work

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The synthesis of optically pure functionalized cleft molecules derived from dibenzobicyclo[b,f][3.3.1]nona-5a,6a-diene-6,12-dione is reported. These clefts are reminiscent of Troger's base but contain clefts with different dimensions and additional carbonyl (or alcohol) groups that may be utilized in molecular recognition studies. The 2,8-dimethyl and 2,8-dibromo derivatives were synthesized via an intramolecular Friedel-Crafts acylation and were resolved by chiral HPLC. The 2,8-dinitro derivative was prepared by regiospecific nitration of dibenzobicyclo[b,f][3.3.1]nona-5a,6a-diene-6,12- dione. The dibromo and dinitro derivatives allow direct access to a range of functionalized molecular clefts. Palladium-catalyzed coupling of the dibromo derivative afforded the disubstituted phenyl, anisole, and acetylene derivatives, while reduction of the dinitro derivative and acetylation provided amino-dione and amide-hydroxyl derivatives. X-ray crystal structures of the dimethyl 12, dibromo 13, di(p-methoxyphenyl) 16, dinitro 18, and dimethyl dinitro 22 derivatives show cleft angles between the planes between the aromatic rings of 84-104°. The synthetic route, structural features, and potential for molecular recognition studies of this class of clefts are compared with those of the more widely studied Troger's base cleft molecules.

Original languageEnglish
Pages (from-to)3042-3046
Number of pages5
JournalJournal of Organic Chemistry
Volume65
Issue number10
DOIs
Publication statusPublished - 19 May 2000

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