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Tandem [4 + 2]/[3 + 2] Cycloadditions of Nitroalkenes. 11. The Synthesis of (+)-Crotanecine
作者:Scott E. Denmark、Atli Thorarensen
DOI:10.1021/ja963084d
日期:1997.1.1
base component of a number of pyrrolizidine alkaloids. This necine subunit is an amino triol bearing a primary allylic alcohol characterized by an all-cis relationship of its stereocenters. The synthesis of (+)-crotanecine has been accomplished in 10 steps and 10.2% overall yield. The key step in the asymmetric synthesis is a Lewis acid-promoted, tandem inter[4 + 2]/intra[3 + 2] cycloaddition between
(+)-Crotanecine (1) 是许多吡咯里西啶生物碱的 necine 碱成分。该 necine 亚基是带有伯烯丙醇的氨基三醇,其特征在于其立体中心的全顺式关系。(+)-crotanecine 的合成分 10 步完成,总产率为 10.2%。不对称合成中的关键步骤是(富马酰氧基)硝基烯烃 14 和手性 β-甲硅烷基乙烯基醚 (-)-26 之间的路易斯酸促进的串联 [4 + 2] / [3 + 2] 内环加成。该合成用于说明串联环加成的合成多功能性以引入额外的功能。
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Yadav, Veejendra Kumar; Rueeger, Heinrich; Benn, Michael, Heterocycles, 1984, vol. 22, # 12, p. 2735 - 2738
作者:Yadav, Veejendra Kumar、Rueeger, Heinrich、Benn, Michael
DOI:——
日期:——
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MATTOCKS, A. R.;JUKES, REBEKAH;BROWN, JANET, TOXICON, 27,(1989) N, C. 561-567
作者:MATTOCKS, A. R.、JUKES, REBEKAH、BROWN, JANET
DOI:——
日期:——
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BENNETT, RICHARD B. (III);CHA, JIN K., TETRAHEDRON LETT., 31,(1990) N8, C. 5437-5440
作者:BENNETT, RICHARD B. (III)、CHA, JIN K.
DOI:——
日期:——
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BUCHANAN, J. GRANT;LIGAJINNI, VEERAPPA B.;SINGH, GURDIAL;WIGHTMAN, RICHAR+, J. CHEM. SOC. PERKIN TRANS., 1,(1987) N 11, 2377-2384
作者:BUCHANAN, J. GRANT、LIGAJINNI, VEERAPPA B.、SINGH, GURDIAL、WIGHTMAN, RICHAR+
DOI:——
日期:——