Stereoselective Asymmetric Synthesis of Pyrrolidines with Vicinal Stereocenters Using a Memory of Chirality-Assisted Intramolecular S<sub>N</sub>2′ Reaction
作者:Jae Hyun Kim、Yundong Chung、Hongjun Jeon、Seokwoo Lee、Sanghee Kim
DOI:10.1021/acs.orglett.0c01307
日期:2020.5.15
An efficient strategy for the asymmetric synthesis of pyrrolidines with vicinal quaternary-tertiary or quaternary-quaternary stereocenters was established. A "memory of chirality" intramolecular SN2' reaction of α-amino ester enolates with allylic halides provided a functionalized pyrrolidine with excellent dia- and enantioselectivity. This method features construction of stereochemically enriched
Scandium(III) triflate catalyzed synthesis of primary homoallylic alcohols via carbonyl-ene reaction
作者:Sabera Sultana、Somasekhar Bondalapati、Kiran Indukuri、Paramartha Gogoi、Pipas Saha、Anil K. Saikia
DOI:10.1016/j.tetlet.2013.01.046
日期:2013.3
Scandium trifluoromethanesulfonate can efficiently catalyze the formation of homoallylic alcohols from olefins and paraformaldehyde in good yields. (c) 2013 Elsevier Ltd. All rights reserved.
ESTERS AND ETHERS OF 3-METHYL-PENTANE-DIOL AND UNSATURATED DERIVATIVES THEREOF AND THEIR USE AS AROMA CHEMICAL