Non-Enzymatic Kinetic Resolution and Desymmetrization of α-Quaternary Carboxylic Acids via Chiral Bifunctional Sulfide-Catalyzed Bromolactonization
作者:Ken Okuno、Mana Hiraki、Bun Chan、Seiji Shirakawa
DOI:10.1246/bcsj.20210347
日期:2022.1.15
Kineticresolution of racemic carboxylic acids is a reliable method to enantioselectively prepare chiral carboxylic acids. Although efficient catalytic kineticresolutions of chiral α-tertiary carboxylic acids have been reported, the kineticresolution of α-quaternary carboxylic acids bearing an all-carbonquaternary stereocenter has remained a formidable challenge. Herein, we report a precious example
Schulze,K. et al., Journal fur praktische Chemie (Leipzig 1954), 1969, vol. 311, p. 153 - 158
作者:Schulze,K. et al.
DOI:——
日期:——
Synthesis of Spiroacetal Enol Ethers by Oxidative Activation of Furan Derivatives
作者:Jeremy Robertson、Sébastien Naud
DOI:10.1021/ol802138t
日期:2008.12.4
Activation of furan by electron transfer combines with the radical stabilizing effect of the alkynyl substituent (R = Ph, MeC[triple bond]C-) to achieve site-selectivecation formation. A tethered hydroxy group acts as a probe of this site-selectivity to produce the ring system present in spirocyclic natural products found in Artemisia and Chrysanthemum species. cis-Dihydroxylation proceeds with high