Asymmetric Methanolysis of Cyclic <i>meso</i>-Anhydrides with Tripodal 2,6-<i>trans</i>-1,2,6-Trisubstituted Piperidine as Chiral Amine Catalyst
作者:Ryo Irie、Tohru Okamatsu、Tsutomu Katsuki
DOI:10.1055/s-2007-982551
日期:2007.6
An opticallyactive tripodal amine, (2 S,6 S)-2,6-bis( O-hydroxyphenyl)-1-(2-pyridylmethyl)piperidine, was proven to be a potent chiral catalyst (1-5 mol%) for methanolytic asymmetric desymmetrization of cyclic MESO-anhydrides to hemiesters. A good level of enantioselectivities (up to 81% ee) was achieved for various substrates, some of which were reported to be poor substrates for methanolysis using
Synthesis of Naphthalimides through Tandem Pd(II)-Catalyzed C(sp<sup>3</sup>)–H Oxidation and Diels–Alder Reaction Using a Transient Directing Group Strategy
作者:Ming-Shun Mei、Yanghui Zhang
DOI:10.1021/acs.orglett.3c01590
日期:2023.7.14
efficient methods for the synthesis of naphthalimides with structural diversity. In this work, we developed a new approach for the synthesis of naphthalimides via a tandemreaction of o-methylbenzaldehydes and maleimides. The tandemreaction involves Pd(II)-catalyzed benzylic C(sp3)–H oxidation using an amino acid as the transient directing group and Diels–Alder reaction. The subsequent dehydration