Asymmetric synthesis of seven-carbon segments of the phorboxazoles and (−)-discodermolide: Complementary route from racemic trans-2,4-dimethyl-8-oxabicyclo[3.2.1]oct-6-en-3-one
作者:Andrea M Misske、H.M.R Hoffmann
DOI:10.1016/s0040-4020(99)00127-1
日期:1999.4
The C20–C26 segment of the phorboxazoles A and B and the C1–C7 segment of (−)-discodermolide were synthesized in excellent chemical and optical yield using trans-2,4-dimethyl-8-oxabicyclo[3.2.1]oct-6-en-3-one rac-1 with four stereogenic centres and three prostereogenic sp2-sites as an early racemic switch.
developed a powerful concept for the rapid assembly of a series of twenty-four homochiral building blocks from simple racemic trans-2,4-dimethyl-8-oxabicyclo[3.2.1]oct-6-en-3-one. The series comprises eight stereochemical pentades of anomeric [3.3.1]lactone acetals, eight stereochemical tetrades of anomeric carbohydrate mimics, and eight stereotetrades of acyclic polypropionate units. The utility of these enantiopure