TsOH·H2O, precursors of N-Boc-imines can be converted into the corresponding α-aryl or α-alkenyl glycine derivatives under gaseous CO2 in moderate-to-high yields with a single operation. α-Isobutenyl glycine thus obtained can be further derivatized into various types of α-amino acids including N-Boc-leucine, serine, and glycine derivatives in short steps.
在1.1当量的PhMe 2 Si-Bpin,5当量的CsF和20摩尔%的TsOH·H 2 O存在下,N -Boc-
亚胺的前体可以转化为相应的α-芳基或α-烯基甘
氨酸一次操作即可在气态CO 2下以中等至高收率得到各种衍
生物。由此获得的α-
异丁烯基甘
氨酸可以在短时间内进一步衍生为各种类型的
α-氨基酸,包括N -Boc-亮
氨酸,
丝氨酸和甘
氨酸衍
生物。