An Improved Method for the Protection of Carboxylic Acids as 1,1-Dimethylallyl Esters
作者:Minoo Sedighi、Selçuk Çalimsiz、Mark A. Lipton
DOI:10.1021/jo061207z
日期:2006.12.1
1,1-Dimethylallyl (DMA) esters of various N-protected amino acids have been synthesized using prenyldimethylsulfonium tetrafluroborate, a reagent that can be readily made and stored, in conjunction with catalytic CuBr. These reactions were complete within several hours and afforded DMA esters in high yields. As has been previously shown in our group, DMA esters represent a palladium-labile proctecting
已经使用异氟戊烯基二甲基s磺酸酯合成了各种N保护的氨基酸的1,1-二甲基烯丙基(DMA)酯,该试剂易于制备和存储,并与催化CuBr结合使用。这些反应在数小时内完成,并以高收率提供了DMA酯。正如我们小组先前所表明的那样,DMA酯代表了羧酸的钯不稳定保护基,就像叔丁基酯一样,它能抵抗亲核攻击。