Synthesis of Z-Protected Aib- and Phe(2Me)-Containing Pentapeptides and Their Crystal Structures
作者:Franziska S. Arnhold、Anthony Linden、Heinz Heimgartner
DOI:10.1002/hlca.201400084
日期:2014.5
A series of pentapeptide derivatives containing α,α‐disubstituted α‐amino acids have been prepared by a combination of the ‘azirine/oxazolone method’ and segment condensations. X‐Ray crystal‐structure determinations of the molecular structures confirmed the presence of helical conformations stabilized by β‐turns of type III or III′. Pentapeptides containing (R)‐Phe(2Me) form a right‐handed helix, whereas
Ringerweiterungen und Ringverengungen bei der Umsetzung von 1, 3-Oxazolidin-2, 4-dionen und 1, 3-Thiazoiidin-2, 4-dion mit 3-Amino-2H-azirinen
作者:Simon M. Ametamey、Heinz Heimgartner
DOI:10.1002/hlca.19900730520
日期:1990.8.8
Ring Enlargements and Ring Contractions in the Reaction of 1, 3-Oxazolidine-2, 4-diones and l, 3-Thiazolidine-2, 4-dione with 3-Amino-2H-azirines
1,3-Oxazolidine-2,4-diones和1,3-Thiazolidine-2,4-dione与3-Amino-2 H -azirines反应的环扩大和环收缩
Ring Enlargement of Eight- and Nine-membered Cyclic Sulfonamide Derivatives in Reactions with 3-Amino-2H-azirines
作者:Heinz Heimgartner、Tonya R. Mihova、Anthony Linden
DOI:10.3987/com-98-s19
日期:——
AMETAMEY, SIMON M.;HEIMGARTNER, HEINZ, HELV. CHIM. ACTA , 73,(1990) N, C. 1314-1328
作者:AMETAMEY, SIMON M.、HEIMGARTNER, HEINZ
DOI:——
日期:——
3-(Dimethylamino)-5,6,7,8,9,10-hexahydro-12,13-dimethoxy-4<i>H</i>-spiro[benzo-1-thia-2,5-diazacyclododecene-4,1'-cyclobutan]-6-one 1,1-Dioxide Dichloromethane Solvate (1/1) at 173K
作者:A. Linden、T. R. Mihova、H. Heimgartner
DOI:10.1107/s0108270198008476
日期:1998.11.15
The 12-membered ring in the title compound, C20H29N3-O5S.CH2Cl2, has conformational disorder with the two C atoms adjacent to the fused benzene ring each occupying two sites. The major conformer is present in 74.3(8)% of the molecules. The formal N2=C bond in the 12-membered ring and the adjacent C-N bond of the dimethylamino substituent have almost identical lengths, indicative of the electron donor character of the dimethylamino group. The amide group has the trans conformation and forms an intramolecular hydrogen bond with one of the sulfonyl O atoms. The solvent molecule forms C-H ... O hydrogen bonds with the organic substrate. This novel heterocycle has been formed by a ring enlargement reaction of the corresponding nine-membered 1,2-benzothiazonin-3-one 1,1-dioxide and 2-(dimethylamino)-1-azaspiro[2.3]hex-1-ene.