The role of an aromatic group in remote chiral induction during conjugate addition of α-sulfonylallylic carbanions to ethyl crotonate

• Shlomo Levinger,
• Ranjeet Nair and
• Alfred Hassner

Beilstein J. Org. Chem. 2008, 4, No. 32, doi:10.3762/bjoc.4.32

• increase in diastereoselectivity for the more electron deficient nitro derivative 1c. The most remarkable case of remote chirality transfer (over 99% dr), was observed for the 9-anthryl case 1h, which showed a rate enhancement as well [15][16]. In order to determine whether an unusual steric effect may

Solvent- controlled regioselective protection of allyl- 4,6-benzylidene glucopyranosides

• Kerry Ann Ness and
• Marie E. Migaud

Beilstein J. Org. Chem. 2007, 3, No. 26, doi:10.1186/1860-5397-3-26

• ' reactivity under basic conditions. It appears that the regioselectivity observed in THF for the glucoside 2 was directed by three factors, the nature of the halogenated reagent (steric effect), the hydrogen bond network created by the alpha configuration and finally while unexpectedly the presence of an