Synthesis of asymmetrized 2-benzyl-1,3-diaminopropane by a chemoenzymatic route: a tool for combinatorially developing peptidomimetics
摘要:
Both enantiomers of monoacetamide 5, together with 'dipeptides' 30a,b and monocarbamates 24, (R)-43 and (S)-43, all derived from 2-benzyl-1,3-diaminopropane 4, were synthesized by a chemoenzymatic route starting from the known monoacetate 12. The behaviour of 4 and of the bis(acylated) derivatives 8-11 with respect to hydrolytic enzymes is also presented, together with an extensive study on the configurational stability of monoacylated derivatives of 4. (C) 1999 Elsevier Science Ltd. All rights reserved.
A wide range of prochiral 1,3-diamines were first efficiently synthesized and subsequently desymmetrized by using lipase from Pseudomonas cepacia as catalyst and diallyl carbonate as alkoxycarbonylating agent. In all cases, the amino carbamates of R-configuration were recovered. Final selective cleavage of the N-allyloxycarbonyl moiety was carried out under mild reaction conditions, which demonstrates
is achieved solely by the application of microwave-assisted chemistry, without any need of activating agents or protecting group manipulations. The product formation of various substituted guanidines from the corresponding isothiouroniumsalts was controlled by the nucleophilicity of the counterion and influenced by the reaction temperature. Further, a new fast-track access to tetrahydropyrimidin-2-ylamines
(Ethylene)-(propylene) - triaminepentaacetic acid derivatives, process for their production, and their use for the production of pharmaceutical agents
申请人:Schering AG
公开号:US20030194371A1
公开(公告)日:2003-10-16
The invention relates to (ethylene)-(propylene)-triaminepentaacetic acid derivatives that are substituted on both the ethylene bridge and the propylene bridge, as well as conjugates of these compounds with biomolecules. The compounds and conjugates are suitable as agents for NMR diagnosis and radiodiagnosis as well as for radiotherapy.
Subtype-selective NMDA receptor ligands and the use thereof
申请人:——
公开号:US20010051633A1
公开(公告)日:2001-12-13
The invention relates to subtype-selective NMDA receptor ligands and the use thereof for treating or preventing neuronal loss associated with stroke, ischemia, CNS trauma, hypoglycemia and surgery, as well as treating neurodegenerative diseases including Alzheimer's disease, amyotrophic lateral sclerosis, Huntington's disease and Down's syndrome, treating or preventing the adverse consequences of the overstimulation of the excitatory amino acids, treating anxiety, psychosis, convulsions, aminoglycoside antibiotics-induced hearing loss, migraine headache, chronic pain, Parkinson's disease, glaucoma, CMV retinitis, urinary incontinence, opioid tolerance or withdrawal, and inducing anesthesia, as well as for enhancing cognition.
Isoquinolinesulfonamide derivatives and process for the preparation thereof
申请人:Asahi Kasei Kogyo Kabushiki Kaisha
公开号:EP0109023A1
公开(公告)日:1984-05-23
This invention relates to novel isoquinolinesulfonamide derivates of Formula (I):
wherein A is a C0-10 alkylene group or a C0-10 alkylene group having a C1-10 alkyl group, a phenyl group, a substituted phenyl group or a phenylalkyl group; R1 and R2 each is a hydrogen atom; or R1 and R2 are linked directly to form an ethylene group unsubstituted or substituted with a C1-4 alkyl group;
R3 and R4 each is a hydrogen atom, a C1-6 alkyl group or linked directly to form a C2-6 alkylene group; and the pharmaceutically acceptable acid addition salt thereof, and to a precess for preparing them. The isoquinoline derivatives possess a relaxatory action for vascular smooth muscle and action for increasing blood flow and are useful as a vasodilator and a hypotensor.