Stereoselective synthesis of (3S,4R)-3,4-dimethyl-(S)-glutamine and the absolute stereochemistry of the natural product from papuamides and callipeltin
作者:Naoki Okamoto、Osamu Hara、Kazuishi Makino、Yasumasa Hamada
DOI:10.1016/s0957-4166(01)00231-2
日期:2001.6
(3S,4R)-3,4-Dimethyl-(S)-glutamine, a common component of cyclodepsipeptides, papuamide A and callipeltin A, was stereoselectively prepared from (S)-pyroglutamic acid. The stereostructure of natural dimethylglutamine was unambiguously confirmed to be (2S,3S,4R) by comparison of the CD and NMR spectra of the synthetic 3,4-dimethylpyroglutamic acid with the hydrolysate of callipeltin A. (C) 2001 Elsevier Science Ltd. All rights reserved.
(3S,4R)-3,4-二甲基-(S)-谷氨酰胺是环状 depsipeptide、Papuamide A 和 Callipeltin A 的常见成分,可通过从(S)-吡咯谷氨酸立体选择性制备。通过对合成的 3,4-二甲基吡咯谷氨酸的 CD 和 NMR 谱图与 Callipeltin A 水解产物的比较,明确确认天然二甲基谷氨酰胺的立体结构为 (2S,3S,4R)。© 2001 Elsevier Science Ltd. 保留所有权利。