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
An Optimized Preparation of 1,1-Dimethylallyl Esters and Their Application to Solid-Phase Peptide Synthesis
作者:Matthew A. Hostetler、Mark A. Lipton
DOI:10.1021/acs.joc.8b00658
日期:2018.8.3
A one-step preparation of 1,1-dimethylallyl (DMA) esters was optimized for the C-terminal protection of a range of Fmoc-protected amino acids. This preparation is not sensitive to the scale of reaction and affords the corresponding DMA esters in 70–99% yield with high regioselectivity. Additionally, these DMA-protected amino acids were used with the backbone amide linker (BAL) of Albericio and Barany