Synthesis of (±)-Deoxysymbioimine Using an Intramolecular Diels–Alder Reaction with anN-Alkoxycarbonyl 2,3-Dihydropyridinium Cation as the Dienophile
作者:Barry B. Snider、Qinglin Che
DOI:10.1002/anie.200503467
日期:2006.1.30
Total Synthesis of (±)-Symbioimine
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