Treatment of N-phenyl-3-(phenylsulfonyl)propanamide with 2 equiv. of butyllithium at −78 °C afforded the dianion. Aldehydes and ketones upon treatment with the dianion provided stable γ-hydroxy amides, which were converted in good yields to 5-alkyl-2(5H)-furanones. Optically active (R)- and (S)-5-octyl-2(5H)-furanones, and (R)- and (S)-5-tridecyl-2 (5H)-furanones were prepared from aldehydes and the dianions, derived from chiral N-monosubstituted-3-(phenylsulfonyl)propanamides.
在 -78 °C 下,用 2 等量的丁
锂处理 N-苯基-3-(苯磺酰基)丙酰胺,可得到萃取物。醛和酮在与该二元离子进行处理后,可生成稳定的 γ-羟基酰胺,并以良好的产率转化为 5-烷基-
2(5H)-呋喃酮。光学活性的 (R)- 和 (S)-5- 辛基-
2(5H)-呋喃酮以及 (R)- 和 (S)-5-
十三烷基-
2(5H)-呋喃酮是由醛和手性 N-单取代-3-(苯磺酰基)丙酰胺衍生的二元离子制备的。