Synthesis of β2-homophenylalanine derivatives by Negishi cross-coupling reactions
作者:Hannah E. Bartrum、Harry Adams、Lorenzo Caggiano、Richard F.W. Jackson
DOI:10.1016/j.tet.2008.02.024
日期:2008.4
Three approaches to the synthesis of β2-homophenylalanine derivatives using Negishi cross-coupling reaction are reported. In the first two approaches, two protected α-iodomethyl-β-amino esters are each converted into the corresponding organozinc iodides, which then undergo Pd-catalysed cross-coupling with aromatic halides to give β2-homophenylalanine derivatives, and the X-ray crystal structure of
三种方法来β的合成2个用Negishi交叉偶联反应被报告-高苯丙氨酸衍生物。在前两种方法,两个被保护α-碘甲基-β氨基酯分别转化成相应的有机锌碘化物,其然后经历钯催化的交叉偶联与芳族卤化物,得到β 2 -高苯丙氨酸衍生物,并且所述X射线报告了一种产品的晶体结构。可选地,根岸衍生自锌试剂的交叉偶联ñ -苄基-3-碘甲基氮杂环丁烷-2-酮和芳基卤化物,得到3- benzylazetidin -2-酮,掩蔽β 2 -高苯丙氨酸衍生物。1-苄基-3-[(p-甲苯磺酰氧基)-甲基]-氮杂环丁烷-2-酮证实了结构分配。