Short Total Synthesis of (-)-Lupinine and (-)-Epiquinamide by Double Mitsunobu Reaction
作者:Leonardo Santos、Yaneris Mirabal-Gallardo、Nagula Shankaraiah、Mario Simirgiotis
DOI:10.1055/s-0030-1258356
日期:2011.1
(-)-epiquinamide (2) have been described via the key intermediate 3 obtained from the addition of 2-trialkylsilyloxyfuran 5 to N-acyliminium intermediate derived from 4. The major R,R-isomer 8 obtained from the Mannich reaction was converted into its R,S-isomer through Mitsunobu reaction. Then, a second Mitsunobu reaction of 3 led to cyano 9 and azido 11 derivatives, which were converted into 1 and 2 in 33 and
(-)-羽扇豆碱(1)和(-)-表喹酰胺(2)的替代总合成物已通过关键中间体3进行了描述,该中间体是将2-三烷基甲硅烷基氧基呋喃5加到由4衍生的N-酰基亚胺中间产物而获得的。由曼尼希反应获得的主要的R,R-异构体8通过Mitsunobu反应转化为它的R,S-异构体。然后,第二次3的Mitsunobu反应导致了氰基9和叠氮基11衍生物,它们被转化为1和分别占33%和2%的产率(来自4)。合成途径适合于产生几种喹诺唑烷生物碱。 喹喔啉生物碱-叠氮基还原-硼化镍-微波辐射-Mitsunobu反应