Studies towards the total synthesis of halichlorine: asymmetric synthesis of the spiroquinolizidine subunit
摘要:
The C1-C15 spiroquinolizidine subunit (cf. 2) of the marine natural product halichlorine (1) was prepared in 12 steps starting from the known 'Meyers-lactam' 5. The synthesis involves a B-alkyl-Suzuki coupling followed by a highly stereoselective intramolecular Michael addition and an intramolecular Mannich ring closure. (C) 1999 Elsevier Science Ltd. All rights reserved.
a mixture of ethanol and water yields the expected lactams, we exemplified the reaction and procedure with the preparation of a library of 80 members. Our synthesis scheme is validated for synthesis scales from 1 to 100 mg. Therefore, it can be used both to produce rapidly test samples for HTS as well as to prepare intermediates for the synthesis of more elaborated nature-inspired compounds.
Utilization of industrial waste materials. Part 14.† Synthesis of β-amino alcohols and thiols with a 2-azabicyclo[3.3.0]octane backbone and their application in enantioselective catalysis
New, chiral β-tert-amino tert-alcohols have been synthesized from the enantiomerically pure sec-amine (all-R)-1b via the new glycine, alanine and phenylglycine derivatives 2–6. Grignard additions to these esters provided the new rigid amino alcohols 7–11 in fair yields. The absolute configurations of the stereogenic centers, which arose during the alkylation step, were assigned by an independent route
The present invention relates to the use of novel triazolopyridine derivatives of formula I:
wherein all variable substituents are defined as described herein, which are SYK inhibitors and are useful for the treatment of auto-immune and inflammatory diseases.
[EN] TRIAZOLOPYRIDINE COMPOUNDS<br/>[FR] COMPOSÉS DE TRIAZOLOPYRIDINE
申请人:HOFFMANN LA ROCHE
公开号:WO2012163724A1
公开(公告)日:2012-12-06
The present invention relates to the use of novel triazolopyridine derivatives of formula I: wherein all variable substituents are defined as described herein, which are SYK inhibitors and are useful for the treatment of auto-immune and inflammatory diseases.
The present invention relates to ethynyl derivatives of formula I
wherein
R
1
is phenyl, which is optionally substituted by 1-2 halogen atoms; selected from fluorine or chlorine;
or to a pharmaceutically acceptable acid addition salt in enantiomerically pure form.
It has been found that the compounds of general formula I are allosteric modulators of the metabotropic glutamate receptor subtype 5 (mGluR5).