Asymmetric Diels-Alder reaction of the N-dienyl-L-pyroglutamic esters 1a-h with acyl nitroso dienophiles 4a-h gave diastereoisomeric adducts 6a-n, 7a-n with 12–90 % de, depending on solvents and temperature. An interpretation was gived. The “allylic effect” ( MO interactions) was found to be effective to account for the conformations of the adducts.
Acid-labile histidine side-chain protection: the N(π)-t-butoxymethyl group
作者:Robert Colombo、Fabio Colombo、John H. Jones
DOI:10.1039/c39840000292
日期:——
N-(α)-Benzyloxycarbonyl-N(π)-t-butoxymethyl -L-histidine (1)and N(α)-fluoren-9-ylmethoxycarbonyl--N(π)-t-butoxymethyl-L-histidine(2)have been prepared and their use for the synthesis of peptides containing histidine residues has been demonstrated in two simple exercises; no difficulties were encountered, the base-and hydrogenolysis-resistant imidazole imidazole protecting group ultimately being removed
Pharmaceutical preparations having psychotropic activity and process for
申请人:Hoechst Aktiengesellschaft
公开号:US04053588A1
公开(公告)日:1977-10-11
Pharmaceutical preparations containing an L-pyroglutamic acid amide, processes for their preparation and methods of treating psychotic diseases with them.
含有L-吡罗氨酸酰胺的制药制剂,其制备方法以及使用它们治疗精神病的方法。
Method for the solid-phase synthesis of retro-inverso polypeptides
申请人:ENICHEM S.p.A.
公开号:EP0097994A2
公开(公告)日:1984-01-11
This invention relates to a method for the solid-phase synthesis of polypeptides containing retro-inverted peptide bonds, using polydimethylacrylamide-co-acryloylsarcosi- methylester resin cross-linked with N, N'-ethylene-bisacrylamide as the insoluble support for lengthening the polypeptide chain in stages by the addition of suitable amino acid derivatives and/or peptides in succession. In particular, the method described in the present invention allows the easy preparation, on the polymer matrix, of monoacylated gem-diamino residues using the reagent I, I-bis (trifluoroace- toxy) iodobenzene in mixed aqueous-organic solvents.
Tripeptides having hypotensive activity, to be defined by the following general formula:
wherein:
A represents a residue of L-pyroglutamic acid, L-proline or L-proline bearing a substituent on its amino group
wherein R, is an acyl with a number of carbon atoms in straight chain not higher than 9, a benzyloxycarbonyl group or an alkyloxycarbonyl group;
B is an a-aminoacidic residue deriving from one of the natural aminoacids;
C is a residue of L-tryptophan (Trp), of L-phenylalanine (Phe) or of L-tyrosine (Tyr);
Z is a hydrogen atom or an alkyl group with a number of carbon atoms in straight chain not higher than 9.
具有降血压活性的三肽,由以下通式定义:
其中
A 代表在其氨基上带有取代基的 L-焦谷氨酸、L-脯氨酸或 L-脯氨酸的残基
其中 R 是直链碳原子数不大于 9 的酰基、苄氧羰基或烷氧羰基;
B 是源自天然氨基酸之一的 a-氨基酸残基;
C 是 L-色氨酸(Trp)、L-苯丙氨酸(Phe)或 L-酪氨酸(Tyr)的残基;
Z 是氢原子或直链碳原子数不超过 9 的烷基。