(2E,4E)-5-Tosyl-2,4-pentadienamides: New dienic sulfones for the stereoselective synthesis of (2E,4E)-dienamides
作者:M.Carmen Bernabeu、Rafael Chinchilla、Carmen Nájera
DOI:10.1016/0040-4039(95)00594-3
日期:1995.5
The iodosulfonylation of (2E)-pentadienamides 1 affords stereoselectively (2E,4E)-5-tosylpentenamides2. These dienic sulfones suffer nucleophilic vinylic substitution of the tosyl group by sodium thiolates and Grignard reagents to give regio- and stereo-selectively (2E,4E)-dienamides 3. This methodology has been applied to the synthesis of sarmentine (3bg) and an Achillea amide (3cg).
(2 E)-戊二烯酰胺1的碘磺酰化可立体选择性地提供(2 E,4 E)-5-甲苯磺酰基戊烯酰胺2。这些二烯砜遭受硫醇钠和格利雅试剂的甲苯磺酰基的亲核乙烯基取代,以产生区域和立体选择性(2 E,4 E)-二酰胺3。该方法已应用于合成sarmentine(3bg)和Achillea amide(3cg)。