Synthesis of carba sugars from aldonolactones. Part IV. Stereospecific synthesis of carbaheptopyranoses by radical-induced carbocyclisation of 2,3-unsaturated octonolactones

Sussi Holstein Wagner, Inge Lundt

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Three new carbaheptopyranoses, 6-deoxy-5a-carba-beta -L-gulo- (8), 5a-carba-D-glycero-beta -D-ido- (22) and 5a-carba-L-glycero-alpha -L-galacto-heptopyranose (25), have been prepared from 8-bromo-8-deoxy-2,3-unsaturated octono-1,4-lactones with L-galacto-, D-gluco- and D-manno-configuration, respectively. The key step was a regio- and stereoselective 6-exo-trig radical-induced carbocyclisation of the unsaturated octonolactones to give bicyclic cyclohexane-lactone derivatives. Reduction of the lactone moiety using Ca(BH4)(2) gave the said carbaheptopyranoses. The 8-bromo-8-deoxy-2,3-unsaturated octonolactones were prepared from the inexpensive, commercially available D-glycero-D-gulo-heptonolactone and L-tartaric acid.
Original languageEnglish
JournalRoyal Chemical Society. Journal. Perkin Transactions 1
Volume1
Issue number8
Pages (from-to)780-788
ISSN1472-7781
Publication statusPublished - 2001

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