Asymmetric Synthesis of Chiral<i>N</i>-Sulfinyl 3-Alkyl- and 3-Arylpiperidines by α-Alkylation of<i>N</i>-Sulfinyl Imidates with 1-Chloro-3-iodopropane
作者:Filip Colpaert、Sven Mangelinckx、Norbert De Kimpe
DOI:10.1021/jo1020807
日期:2011.1.7
l-5-chloropentylamines, which could be cyclized to a range of new chiral 3-substituted N-tert-butanesulfinylpiperidines using NaH in DMSO. Finally, the N-tert-butanesulfinylpiperidines could be efficiently deprotected to enantiomerically pure 3-alkyl- and 3-arylpiperidine hydrochlorides.
的α-烷基化ñ -亚磺酰基与亚氨酸酯1-氯-3-碘丙烷成功导致2-取代Ñ -叔-butanesulfinyl -5- chloropentanimidates在可接受的非对映体比率(DR 67/33至72/28)和良好的产率(74 −86%)。随后的还原用NaBH 4导致相应的2-取代的Ñ -叔-butanesulfinyl -5- chloropentylamines,其可环化的范围的新的手性3-取代ñ -叔-butanesulfinylpiperidines在DMSO中的NaH使用。最后,N - tert-丁烷亚磺酰基哌啶可有效地脱保护为对映体纯的3-烷基-和3-芳基哌啶盐酸盐。