Monocharged inhibitors of mast cell tryptase derived from potent and selective dibasic inhibitors

Truncation of potent and selective dibasic inhibitors afforded monocharged inhibitors of human mast-cell tryptase. Using two classes of analogues as lead structures, several monocharged derivatives were identified with K(i) values ranging from 0.084 to 0.21 microM against the enzyme.

Dibasic inhibitors of human mast cell tryptase. Part 3: identification of a series of potent and selective inhibitors containing the benzamidine functionality

A survey of charged groups and linkers for a series of symmetrical and unsymmetrical dibasic inhibitors is described, leading to several classes of potent and selective inhibitors. In particular, the benzamidine functionality was identified as the most potent charged group investigated.

Dibasic inhibitors of human mast cell tryptase. Part 2: structure-activity relationships and requirements for potent activity

Detailed structure activity relationships (SARs) for a series of dibasic human tryptase inhibitors are presented. The structural requirements for potent inhibitory activity are remarkably broad with a range of core template modifications being well tolerated. Optimized inhibitors demonstrate potent anti-asthmatic activity in a sheep model of allergic asthma. APC-2059, a dibasic tryptase inhibitor with subnanomolar activity, has been advanced to phase II clinical trials for the treatment of both psoriasis and ulcerative colitis.

Dibasic inhibitors of human mast cell tryptase. Part 1: synthesis and optimization of a novel class of inhibitors

The synthesis and optimization of a novel class of reversible and active-site directed dibasic inhibitors of human mast cell tryptase are described. The compounds were shown to be both remarkably potent and selective for tryptase with Ki values for optimized inhibitors in the picomolar range.

Analysis of 9-fluorenylmethoxycarbonyl (FMOC) loading of solid-phase synthesis resins by gas chromatography

Base-catalyzed cleavage of the 9-fluorenylmethoxycarbonyl (FMOC) group and subsequent analysis by UV spectrophotometry is commonly employed to measure the "loading" of functional groups on solid support. Recent work suggests that 1,8-diazabicyclo[5.4. 0]undec-7-ene (DBU) may be superior to piperidine (the most commonly used base for the cleavage) for quantitative analysis by UV. We have compared deprotection of FMOC-bearing compounds by both DBU and piperidine, and have observed by GC-MS the formation of a dibenzofulvene-piperidine adduct (piperidine deprotection), and the formation of unassociated dibenzofulvene (DBU deprotection). We have further been able to use GC analysis of dibenzofulvene produced in the DBU deprotection mixture in a quantitative analysis of resin loading, which gave results comparable to UV methods. Sample preparation for this method has been automated using the Nautilus 2400 organic synthesizer to reduce the amount of operator time and increase throughput of sample analysis. Copyright 1998 John Wiley & Sons, Inc.