用烯丙醇/ Ti(OR)4加热非对映异构纯N-酰基磺酰胺3或4,可有效产生阿磺胺1或2和烯丙基酯5。在威尔金森氏催化剂的存在下,在非碱性条件下将酯5水解,得到对映异构和非对映异构纯的羧酸7。因此,由N- [ N '-(Fmoc)氨基]酰基苏丹酰胺12制备了一系列[[芴-9-基)甲氧基]-羰基-(Fmoc)-保护的氨基酸14。
用烯丙醇/ Ti(OR)4加热非对映异构纯N-酰基磺酰胺3或4,可有效产生阿磺胺1或2和烯丙基酯5。在威尔金森氏催化剂的存在下,在非碱性条件下将酯5水解,得到对映异构和非对映异构纯的羧酸7。因此,由N- [ N '-(Fmoc)氨基]酰基苏丹酰胺12制备了一系列[[芴-9-基)甲氧基]-羰基-(Fmoc)-保护的氨基酸14。
Photochemical Protection of Amines with Cbz and Fmoc Groups
作者:Céline Helgen、Christian G. Bochet
DOI:10.1021/jo026581n
日期:2003.3.1
The photochemical conversion of amines into carbamates was achieved using N-Cbz- N-Fmoc-, and N-Boc-5,7-dinitroindolines. This reaction allows the protection of amines in neutral medium. Primary and unhindered secondary amines were protected to yield their benzyloxycarbonyl- and 9-fluorenylmethoxycarbonyl derivatives efficiently, whereas bulky amines or anilines gave low yields or no product. On the other hand, the formation of N-Boc compounds, although possible, proceeded only with low yields.