polymethylhydrosiloxane (PMHS) as well as certain amounts of appropriate alcohol and base additives, the non-precious metal copper-catalyzed asymmetric 1,4-hydrosilylation of β-aryl or β-alkyl-substituted N-aryl β-enamino esters was well realized to afford a diverse range of N-aryl β-aminoacid esters in high yields and excellent enantioselectivities (26 examples, 90–98% ee). This approach tolerated the handling of
Efficient Rhodium-Catalyzed Asymmetric Hydrogenation for the Synthesis of a New Class of <i>N</i>-Aryl β-Amino Acid Derivatives
作者:Qian Dai、Weiran Yang、Xumu Zhang
DOI:10.1021/ol0523897
日期:2005.11.1
N-Aryl beta-amino esters were obtained by asymmetric hydrogenation of a new class of N-aryl beta-enamino esters. High conversions and up to 96.3% ee values were achieved with a Rh-TangPhos catalyst.
Synthesis of Diversely Substituted Indoloquinolinones via Pd(II)/Cu(II)-Mediated Oxidative C–C Bond Formation and I(III)-Mediated C–N Bond Formation
one-pot sequence of N-alkylation, saponification and methoxyamidation, and final intramolecular oxidative C–N bond formation. The underpinning of the strategy entails Pd(OAc)2/Cu(OAc)2-mediated oxidative C(sp2)–C(sp2) bond formation and I(III)-mediated oxidative C(sp2)–N bond formation.