Enantio- and Diastereomerically Pure Decalins by Deslongchamps-Type Annulation of Dienolates Containing a Chiral Lactone Substituent
作者:Thomas Tricotet、Reinhard Brückner
DOI:10.1002/ejoc.200601047
日期:2007.3
the relative and absolute configuration of up to 5 stereocenters. They emerge from the anionic Diels–Alder reactions (“Deslongchamps annulations”) between oxocyclohexenecarboxylates 25, 29 and dienolates 26, 30. The latter contain a γ-lactone. A Ph3Si–CH2 substituent therein controls the asymmetry of C–C bond formation with ds ≈ 10:1. Strangely, the preferred sense of attack of the dienophile is contrasteric