Tetrahedron p. 5807 - 5824 (1990)
Update date:2022-08-05
Topics:
Casiraghi, Giovanni
Colombo, Lino
Rassu, Gloria
Spanu, Pietro
Fava, Giovanna Gasparri
Belicchi, Maria Ferrari
The BF3-promoted addition of 2-(trimethylsiloxy)furan to three carbon synthons derived from D- and L-glyceraldehyde, D- and L-serinal, and imines thereof furnishes C7 α,β-unsaturated 2,3-dideoxy-aldonolactone derivatives in high yield, with very high level of diastereoselection.In all the cases, compounds having 4,5-threo:5,6-erythro relative stereodisposition preferentially emerge from the reactions, accompanied by only marginal amounts of 4,5-erythro:5,6-threo epimers.An empirical rule for the rapid assignment of the configuration at C-4 (γ-carbon) of γ-substituted unsaturated and saturated β-butyrolactones is given, based upon the sign of the optical rotation values.
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