作者:Aurélie A. Dörr、William D. Lubell
DOI:10.1016/j.tetlet.2010.11.089
日期:2011.4
2-Pyrrolylalanine has been synthesized in two protected forms and applied in the solution-phase synthesis of a dipeptide. (2S)-N-(Boc)-N'-(phenylsulfonyl)- and (2S)-N,N'-bis-(phenylsulfonyl)-3-(2-pyrrolyl)alanines (7 and 9) were obtained, respectively, in 14% and 13% overall yields and six and seven steps from oxazolidine beta-methyl ester 1, which was derived from L-aspartic acid. Homoallylic ketone 2 was obtained from a copper-catalyzed cascade addition of vinylmagnesium bromide to 1 and converted into pyrrolylalanines 7 and 9 by a sequence featuring subsequent olefin oxidation and Paal-Knorr condensation. Protected pyrrolylalanine 9 was then introduced into a dipeptide. Crown Copyright (C) 2010 Published by Elsevier Ltd. All rights reserved.