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