Stereoselective Synthesis of Chiral 2,3-Disubstituted 2,3-Dihydro-4(1<i>H</i>)-pyridones
作者:Pablo Etayo、Ramón Badorrey、María D. Díaz-de-Villegas、José A. Gálvez
DOI:10.1002/ejoc.200800697
日期:2008.12
2,3-dihydro-4(1H)-pyridone with different electrophiles took place with total trans diastereoselectivity to afford the corresponding (2R,3S)-2,3-disubstituted 2,3-dihydro-4(1H)-pyridones in enantiomerically pure form. The configuration at C-3 can be inverted by deprotonation and subsequent reprotonation to yield the corresponding (2R,3R)-2,3-disubstituted 2,3-dihydro-4(1H)-pyridones in a highly diastereoselective
容易获得的 (R)-2-[(S)-1,2-双(苄氧基)乙基]-1-[(S)-1-苯乙基]-2,3-二氢-在C-3处的烷基化具有不同亲电子试剂的 4(1H)-吡啶酮以总反式非对映选择性发生,以提供相应的 (2R,3S)-2,3-二取代 2,3-二氢-4(1H)-吡啶酮,呈对映体纯形式。C-3 的构型可以通过去质子化和随后的再质子化来反转,以高度非对映选择性的方式产生相应的 (2R,3R)-2,3-二取代的 2,3-二氢-4(1H)-吡啶酮。 (© Wiley -VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)