A facile synthesis of (2E)-, (2E, 4E)-unsaturated amides was achieved via arsonium bromides with high stereoselectivity. Its application to the synthesis of related natural products 4 and 5 is also reported.
A convenient and rapid approach for the synthesis of naturally occurring unsaturated amide alkaloids 1a1n by the recently developed one-flask RambergBacklund reaction is described. The starting material was alcohol 3, which was transformed into thiolacetate 4 using the Mitsunobu reaction. In situ cleavage of acetyl moiety of 4, followed by alkylation of the resulting thiol with appropriate chloroacetamide
USE OF SARMENTINE AND ITS ANALOGS FOR CONTROLLING PLANT PESTS
申请人:Huang Huazhang
公开号:US20110021358A1
公开(公告)日:2011-01-27
Methods and compositions for controlling plant pests, particularly weeds and/or plant phytopathogens using sarmentine and/or analogs thereof are disclosed.
揭示了利用沙曼汀和/或其类似物控制植物害虫,特别是杂草和/或植物病原体的方法和组合物。
(2E,4E)-5-Tosyl-2,4-pentadienamides: New dienic sulfones for the stereoselective synthesis of (2E,4E)-dienamides
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).