A highly enantioselective construction of δ- and γ-lactone[2,3-b]piperidine skeletons was accomplished by tandem aza-Diels–Alder reaction–hemiacetal formation–oxidation from N-Tos-1-aza-1,3-butadienes and aliphatic dialdehydes.
δ-和的高度对映选择性 γ-内酯[2,3- b ]哌啶通过串联氮杂-狄尔斯-阿尔德反应-半缩醛形成-N -Tos-1-氮杂-1,3-丁二烯和脂肪族二醛的氧化来完成骨架。
Nickel(II)-Catalyzed Cascade Vinylogous Mukaiyama 1,6-Michael/Michael Addition of 2-Silyloxyfuran with <i>N</i>-Sulfonyl-1-aza-1,3-dienes: Access to Fused Piperidine/Butyrolactone Skeletons
作者:Kang Liu、Xin Chang、Chun-Jiang Wang
DOI:10.1021/acs.orglett.6b03150
日期:2016.12.16
An unprecedented and highly efficientnickel-catalyzed cascade vinylogous Mukaiyama 1,6-Michael/Michael addition of 2-silyloxyfuran with N-sulfonyl-1-aza-1,3-dienes is reported, in which 2-silyloxyfuran was successfully employed as nucleophile and electrophile sequentially. This methodology combined with subsequent reduction provides a facile access to biologically important fused piperidine/butyrolactone