Novel application of chiral micellar media to the Diels–Alder reaction
作者:Michael J. Diego-Castro
DOI:10.1039/a802825g
日期:——
A novel chiral surfactant has been used in the first reported aqueous chiral micellar catalysis of a DielsâAlder reaction and enantioselectivities have been observed.
Solid-phase total synthesis of nannocystin Ax (1) was disclosed. A coupling reaction between a peptide and a polyketide moiety was conducted on a solid support, and macrocyclization was achieved by Mitsunobu cyclization. The established synthetic route was efficient to prepare itsanalogues, which contain different types of peptide moieties.
Conformational Effects in Diastereoselective Aryne Diels−Alder Reactions: Synthesis of Benzo-Fused [2.2.1] Heterobicycles
作者:Robert Webster、Mark Lautens
DOI:10.1021/ol9019869
日期:2009.10.15
It was found that the diastereoselectivity of the Diels-Alder reaction between arynes and substituted furans is highly sensitive to substitution, which affects the reactive conformation. By varying the location of the groups on the diene partner, it is possible to obtain both excellent chemical yields and high stereoselectivity. This methodology offers rapid and convenient access to enantiomerically pure bicyclic scaffolds which are difficult to prepare by other means.