✍ Scribed by José Barluenga; Roberto Sanz; Francisco J. Fañanás
No coin nor oath required. For personal study only.
N-Allyl-N-(2-1ithioallyl)aniline undergoes intramolecular carbometallation via 5-exo addition on treatment with CuCN. 2-Alkenyl 2-bromophenyl ethers rearrange to 2-(2-alkenyl)pllenols by bromine-lithium exchange and further transmetallation with CuCN.
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## Abstract Starting from the enantiopure 2‐alkenyl sulfoximines 4/5 and __epi__‐4/5, a one‐pot procedure has been developed for the synthesis of tri‐ and tetrasubstituted tetrahydrofuran derivatives with excellent control of all relevant aspects of their structural description. The cyclization of
Quaternary a-amino acids a b s t r a c t Chiral symmetrical alk-2-yne-1,4-diols have been stereoselectively transformed into 5-alkyl-4-alkenyl-4phenyl-1,3-oxazolidin-2-ones, which are precursors of quaternary a-amino b-hydroxy acids. The key step was the cyclization of the bis(tosylcarbamates) of 2-