作者:Paulami Danner、Matthias Bauer、Prodeep Phukan、Martin�E. Maier
DOI:10.1002/ejoc.200400558
日期:2005.1
which contains fragments D and C. After extension at the carboxyl function by esterification with the hydroxy ester 10, the seco compounds 37 and 42 were obtained. Ring closure was achieved by macrolactamization in the presence of TBTU as condensing agent. This work features a streamlined synthesis of the hydroxy ester 10, a short synthesis of the amino acid 14 by enantioselective alkylation of the
缩肽隐藻素 3 (5) 和隐藻素类似物 43 由相应的四个亚基制备。三肽类似物34从起始氨基酯33获得,其包含片段D和C。通过与羟基酯10酯化在羧基官能团处延伸后,获得seco化合物37和42。在作为缩合剂的 TBTU 存在下,通过大环内酰胺化实现闭环。这项工作的特点是简化了羟基酯 10 的合成,通过甘氨酸亚胺 21 的对映选择性烷基化快速合成了氨基酸 14,以及使用 Fmoc 保护基团保护氨基功能。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)