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tert-Butoxy­carbonyl-l-leucyl-l-alanine trichloro­ethyl ester (Boc-l-Leu-l-Ala-OTce)

✍ Scribed by Oku, Hiroyuki ;Endo, Teruya ;Yamada, Keiichi ;Katakai, Ryoichi

Publisher
International Union of Crystallography
Year
2005
Tongue
English
Weight
557 KB
Volume
61
Category
Article
ISSN
1600-5368

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✦ Synopsis

The title compound, C 16 H 27 Cl 3 N 2 O 5 , which is an enantiopure dipeptide trichloroethyl ester, adopts an extended conformation. The molecules are linked via -NHÁ Á ÁO C hydrogen bonds into a unique -spiral assembly along the c axis.

📜 SIMILAR VOLUMES

N—H⋯O=C hydrogen bonding and O⋯O=C repul
N—H⋯O=C hydrogen bonding and O⋯O=C repulsive interactions in tert-butoxy­carbonyl-l-leucyl-l-alanine ethyl ester (Boc-l-Leu-l-Ala-OEt)
✍ Oku, Hiroyuki ;Yamada, Keiichi ;Katakai, Ryoichi 📂 Article 📅 2003 🏛 International Union of Crystallography 🌐 English ⚖ 307 KB

The crystal structure of the title compound, C 16 H 30 N 2 O 5 , has been determined. In the asymmetric unit, there are three independent molecules which adopt extended -sheet conformations. These molecules are linked together into an in®nite column by six hydrogen bonds of the type ±NHÁ Á ÁO C. All

A short depsipeptide: tert-butoxy­carbon
A short depsipeptide: tert-butoxy­carbonyl-l-alanyl-l-lactic acid benzyl ester (Boc-l-Ala-l-Lac-OBzl)
✍ Oku, Hiroyuki ;Suda, Tomohiro ;Yamada, Keiichi ;Katakai, Ryoichi 📂 Article 📅 2004 🏛 International Union of Crystallography 🌐 English ⚖ 214 KB

Single-crystal X-ray study T = 173 K Mean '(C±C) = 0.009 A Ê R factor = 0.070 wR factor = 0.182 Data-to-parameter ratio = 9.1 For details of how these key indicators were automatically derived from the article, see http://journals.iucr.org/e.

An N-protected depsipeptide free acid pr
An N-protected depsipeptide free acid prepared by direct synthesis without using a terminal-C protecting group: tert-butoxy­carbonyl-l-alanyl-l-leucyl-l-lactic acid (Boc-l-Ala-l-Leu-l-Lac-OH)
✍ Oku, Hiroyuki ;Yamada, Keiichi ;Katakai, Ryoichi 📂 Article 📅 2004 🏛 International Union of Crystallography 🌐 English ⚖ 250 KB

Crystals of the title compound, C 17 H 30 N 2 O 7 , were successfully grown from ethyl acetate at room temperature. In the crystal structure, a free carboxylic acid group is found at the terminal C atom. The free acid ÐOH group contributes to a hydrogenbond network, together with two NÐHÁ Á ÁO inter