Enantioselective epoxidation of α,β-unsaturated ketones catalyzed by stapled helical l-Leu-based peptides
作者:Yosuke Demizu、Nanako Yamagata、Saori Nagoya、Yukiko Sato、Mitsunobu Doi、Masakazu Tanaka、Kazuo Nagasawa、Haruhiro Okuda、Masaaki Kurihara
DOI:10.1016/j.tet.2011.06.075
日期:2011.8
Stapled helical l-leucine-based heptapeptides were synthesized and used as catalysts for the enantioselective epoxidation of α,β-unsaturated ketones. All N-terminal free stapled peptides were successfully used as chiral catalysts. Among them, the use of H-hS3,7hS-10 gave epoxide products with high enantioselectivities of up to 99% ee. Furthermore, the dominant conformations of the N-terminal protected
合成了螺旋状的基于1-亮氨酸的七肽,并用作α,β-不饱和酮的对映选择性环氧化的催化剂。所有的N末端自由钉合肽已成功用作手性催化剂。其中,使用^ h - hS的3,7个hS的- 10给环氧产品具有高达99%ee的高对映选择性。此外,N-末端保护的钉接肽的构象显性- [R 3,7 - [R - 10和hS的3,7周的hS - 10通过调查11 H NMR,IR,CD光谱和X射线晶体学分析。肽- [R 3,7 - [R - 10形成的右手(P)在溶液中和在结晶状态α螺旋,而hS的3,7周的hS - 10形成的右手(P)3 10在溶液中螺旋。