Synthesis of the four stereoisomers of several 3-(1-aminoethyl)pyrrolidines. Important intermediates in the preparation of quinolone antibacterials
作者:Mel C. Schroeder、John S. Kiely、Edgardo Laborde、Don R. Johnson、Deedee L. Szotek、John M. Domagala、Thomas M. Stickney、Andre Michel、Jeffrey W. Kampf
DOI:10.1002/jhet.5570290620
日期:1992.10
The use of S-α-methylbenzyl as a chiral auxiliary at N1 allowed separation of diastereomeric 2-pyrrolidinones substituted with an ester, ketoester, ketone and oxime at the C4 position. Reduction of each diastereomer of 4-[1-(hydroxyimino)ethyl]-1-(1-phenylethyl)-2-pyrrolidinone, 10s and 10r, provided a pair of epimeric amines, [11sr and 11ss] and [11rs and 11rr], that were separated by chromatography
在N 1处使用S -α-甲基苄基作为手性助剂可以分离在C 4位被酯,酮酸酯,酮和肟取代的非对映异构体2-吡咯烷酮。的4-每个非对映体〔1-(羟基亚氨基)乙基〕-1-(1-苯基乙基)-2-吡咯烷酮,还原10S和10R,设有一对差向异构体胺,[ 11sr和11SS ]和[ 11rs和11RR ] ,用色谱法分离。将4-(1-氨基乙基)-1-(1-苯基乙基)-2-吡咯烷酮11的四个立体异构体精加工成几种立体化学纯的3-(1-氨基乙基)吡咯烷1和15-23。这些化合物是喹诺酮类抗菌剂的有用中间体(C 7侧链)。