Tandem Overman Rearrangement and Intramolecular Amidomercuration Reactions. Stereocontrolled Synthesis of <i>cis</i>- and <i>trans</i>-2,6-Dialkylpiperidines
作者:Om V. Singh、Hyunsoo Han
DOI:10.1021/ol048961w
日期:2004.9.1
[reaction: see text] Hg(II)-mediated tandem Overman rearrangement and intramolecular amidomercuration reactions were proven to provide a convenient tool for the stereoselective synthesis of cis- and trans-2,6-disubstituted piperidines. Thus, upon treatment with Hg(OTFA)(2) in THF, the trichloroacetimidate 1 directly transformed into the 2,6-dialkyl piperidine 2 with almost exclusive trans selectivity
[反应:见正文]汞(II)介导的串联Overman重排和分子内酰胺化反应被证明为立体选择性合成顺式和反式2,6-二取代哌啶提供了方便的工具。因此,在THF中用Hg(OTFA)(2)处理后,三氯乙酰亚胺酸酯1以几乎排他的选择性选择性直接转化为2,6-二烷基哌啶2。Hg(OTFA)(2)在硝基甲烷中的氨基甲酸酯7的酰胺键固化反应显示出极好的顺式选择性。还报道了solenopsin A和isosolenopsin A的立体选择性合成。