The non-enzymatic kinetic resolution of racemic 2-hydroxyacetals via asymmetric esterification with diphenylacetic acid and pivalic anhydride catalyzed by the chiral acyl transfer catalyst (R)-BTM is reported. The reaction transition states were elucidated using theoretical calculations; it was found that 1,3-dioxolane is a suitable reagent for attaining high selectivity.
US5106861A
申请人:——
公开号:US5106861A
公开(公告)日:1992-04-21
A concise method for the synthesis of 2-tetralone by titanium tetrachloride-promoted cyclization of 4-aryl-2-hydroxybutanal diethyl acetal
作者:Yung-Son Hon、Rammohan Devulapally
DOI:10.1016/j.tetlet.2009.07.129
日期:2009.10
4-Aryl-2-hydroxybutanal diethylacetal, prepared from the reaction of benzyl Grignard reagent and glycidaldehyde diethylacetal, was treated with titanium tetrachloride to give 2-tetralone in good yield. This highly efficient transformation involves tandem oxonium formation, intramolecular Friedel–Crafts alkylation, deethoxylation, and tautomerization in the same flask.