Asymmetric synthesis of 4-aryl dihydroisoquinolin-3-ones and 2-aryl morpholin-3-ones using AgOTf-activated α-bromo arylacetate
作者:Su Kyung Hong、Wongi Park、Yong Sun Park
DOI:10.1016/j.tet.2019.130841
日期:2020.1
A novel asymmetric synthetic strategy to prepare 4-aryl-dihydroisoquinolinones has been developed through a highly regioselective Friedel-Crafts alkylation of benzylamine derivatives with (αR)-α-bromo arylacetates and subsequent facile lactamization. In addition, an efficient asymmetric synthesis of 2-aryl morpholinones is demonstrated with 2-aminoethanol derivatives using the same convenient subs
A new approach to benzylamines using triazene compounds has been developed that is facilitated by the lithiation of aryltriazenes followed by treatment with an electrophile. The regioselectivity of the reaction can be controlled by means of the substituents in the aryl group. The reaction contains the following steps: intramolecular carbon-carbon bond formation involving lithiation of an alkyl group on a 3-nitrogen atom; a 1,2-proton shift; and the subsequent release of nitrogen gas. Through the use of a deuterated triazene, we were able to determine that the reaction proceeds through a 1,2-proton shift. (c) 2006 Elsevier Ltd. All rights reserved.
α-Lithiation of 1-Aryl-3,3-dialkyltriazenes and Intramolecular Conversion to Benzylamine and Tetrahydrobenzotriazine Derivatives