Methyl 2-(Benzyloxycarbonylamino)-2-cyclopropylideneacetate: A Versatile Building Block for Cyclopropyl-Containing Amino Acids
作者:Michael Limbach、Alexander Lygin、Mazen Es-Sayed、Armin de Meijere
DOI:10.1002/ejoc.200800817
日期:2009.3
of various nucleophiles (6 examples, 75–98 % yields) as well as Diels–Alder reactions, both leading to new cyclopropyl-containing amino acids in protected form. An application of 2 in the synthesis of methyl 4-tert-butoxycarbonylmethyl-5-oxo-4,7-diazaspiro[2.5]octane-8-carboxylate (15), a precursor for geometrically constrained bicyclic peptidomimetics of type 16, has also been proved.(© Wiley-VCH Verlag
从L-丝氨酸开始,分九步制备2-(苄氧基羰基氨基)-2-环亚丙基乙酸甲酯(2),总产率为24%。已证明它在各种亲核试剂的迈克尔加成反应(6个实例,产率为75%至98%)以及Diels-Alder反应中均具有合理的反应性,均会生成新的含环丙基氨基酸的保护形式。的一个应用程序2在4-合成叔丁氧基羰基-5-氧代-4,7-二氮杂螺[2.5]辛烷-8-羧酸乙酯(15),用于类型的几何约束双环拟肽前体16,也得到了(©Wiley-VCH Verlag GmbH&Co.KGaA,69451 Weinheim,Germany,2009)