New routes to β-cycloalkylalanine derivatives using serine-derived organozinc reagents
作者:Tomas Carrillo-Marquez、Lorenzo Caggiano、Richard F. W. Jackson、Urszula Grabowska、Alastair Rae、Matthew J. Tozer
DOI:10.1039/b512784j
日期:——
latter route allows access to a range of cycloalkyl derivatives, with ring sizes of 5-8. beta-(1-Methyl-1-cyclohexyl)alanine may be prepared using reaction of the zinc-copper reagent 2 with 3-methyl-2-cyclohexenyl chloride, followed by hydrogenation. The corresponding cyclopentyl derivative may be prepared by reaction of the same zinc-copper reagent 2 with diethyl geranylphosphate, followed by ring-closing
已经开发出两种不同的制备β-环烷基丙氨酸衍生物的途径。第一种方法使用碘代丙氨酸衍生的锌-铜试剂2与环烷-1-烯-3-基磷酸酯的反应,第二种方法使用钯催化的碘代丙氨酸衍生的锌试剂1与环烯基三氟甲磺酸酯的偶联。在每种情况下,不饱和产物的催化加氢产生被保护的β-环烷基丙氨酸。后一种途径允许获得范围为5-8的环烷基的一系列环烷基衍生物。可以使用锌-铜试剂2与3-甲基-2-环己烯基氯的反应,然后氢化来制备β-(1-甲基-1-环己基)丙氨酸。相应的环戊基衍生物可通过将相同的锌铜试剂2与二乙基香叶基磷酸酯反应制得,