Synthetic routes to all four diastereoisomers of 3-thymine-1-( t butoxycarbonyl)aminocyclopentane-1-carboxylic acid have been developed starting from the commercially available (S)-dimethyl malate. The key step in the synthesis involves dialkylation of N-(diphenylmethylene)glycine ethyl ester with 1
On-column preparation of 1-aminocyclopentane-1-[11C]carboxylic acid
✍ Scribed by Ren Iwata; Tatsuo Ido; Masao Tada
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 524 KB
- Volume
- 46
- Category
- Article
- ISSN
- 0969-8043
No coin nor oath required. For personal study only.
✦ Synopsis
A new, convenient on-column method using kieselguhr (Extrelut ~, Merck) has been developed for the synthesis of l-aminocyclopentane-1-[ ~ tC]carboxylic acid ([t ~C]ACPC) from [J ~C]HCN. The whole synthetic procedure, including the trapping and reaction of [~ ~C]HCN as well as the following extraction and acid hydrolysis, was remarkably simplified, and the preparation has been successfully accommodated to routine production of [~C]ACPC. The established method provides radiochemically pure [i IC]ACPC in over 60% radiochemical yield within 40 min after the end of bombardment.
📜 SIMILAR VOLUMES
## Abstract Peptides based on 2‐amino‐2,3‐dihydro‐1H‐cyclopenta[b]anthracene‐2‐carboxylic acid (antAib), a fluorescent, achiral, α‐amino acid belonging to the class of C→C cyclized, C^α,α^‐disubstituted glycines, combined with L‐Ala, up to the hexamer level, were synthesized by solution methods and
Pictet-Spengler condensation of dopamine with (+)-menthyl pyruvate afforded a diastereomeric mixture of menthyl salsolinol-l-carboxylate, from which pure diastereomer was isolated by repeated recrystallizations in ca. 20% yield. Acid hydrolysis of the menthyl ester furnished (-)-(R)-salsolinol-l-car
This study describes the synthesis and some pharmacological properties of eight new analogues of arginine vasopressin (AVP) substituted at position 2 or 3 with cycloleucine (1-aminocyclopentane-1-carboxylic acid, Apc). All new peptides were tested for their pressor, antidiuretic and uterotonic in vi