作者:Yefen Zou、Qinglin Che、Barry B. Snider
DOI:10.1021/ol062333s
日期:2006.11.1
The synthesis of (+/-)-symbioimine (1) has been completed in only 12 linear steps in 8% overall yield. The key step is the treatment of 13b with BF3.Et2O to generate N-carboalkoxydihydropyridinium cation 14b, which undergoes a novel stereospecific intramolecular Diels-Alder reaction to give adduct 16b in 42% yield. Cleavage of the N-Troc group of 16b afforded imine 24b stereospecifically. Cleavage
(+/-)-Symbioimine(1)的合成仅以12个线性步骤完成,总产率为8%。关键步骤是用BF3.Et2O处理13b以生成N-羰基烷氧基二氢吡啶鎓阳离子14b,该阳离子经过新颖的立体定向分子内Diels-Alder反应,以42%的收率得到加合物16b。N-Troc组16b的切割可立体定向提供亚胺24b。TBDMS醚的裂解和硫酸化提供了(+/-)-Symbioimine(1)。[反应:请参见文字]。