A new entry to 9-azabicyclo[3.3.1]nonanes using radical translocation/cyclisation reactions of 2-(but-3-ynyl)-1-(o-iodobenzoyl)piperidinesElectronic supplementary information (ESI) available: Experimental details for 5–16. See http://www.rsc.org/suppdata/p1/b2/b203243k/
作者:Tatsunori Sato、Taro Yamazaki、Yumi Nakanishi、Jun-ichi Uenishi、Masazumi Ikeda
DOI:10.1039/b203243k
日期:2002.6.7
The 2-[4-(trimethylsilyl)but-3-ynyl]piperidines 16a–c, upon treatment with tributyltin hydride in the presence of azoisobutyronitrile in refluxing toluene, gave the 9-azabicyclo[3.3.1]nonanes 17a–c in high yields, respectively. Compound 17c was subjected to desilylation, ozonolysis, and subsequent 1,2-transposition of the resulting carbonyl group to give 9-benzoyl-1-methyl-9-azabicyclo[3.3.1]nonan-3-one, a potential precursor for the synthesis of (±)-euphococcinine.
2-[4-(三甲基硅基)丁-3-炔基]哌啶 16a-c 在回流甲苯中,在偶氮异丁腈存在下用三丁基氢化锡处理后,分别以高产率得到 9-氮杂双环[3.3.1]壬烷 17a-c。化合物 17c 经过脱硅、臭氧分解和随后的 1,2-羰基反式反应,得到 9-苯甲酰基-1-甲基-9-氮杂双环[3.3.1]壬烷-3-酮,这是合成 (±)-euphoccinine 的潜在前体。