## Abstract Regiospecific syntheses of tritium labelled precocene I (**5a**) and precocene II (**5b**), the antijuvenile hormones, have been accomplished. The syntheses involved condensations between 2‐hydroxyacetophenones (**1**) with acetone‐T to give cross condensation products **2** which on cy
Synthesis of tritium labelled mometasone furoate
✍ Scribed by D. Hesk; P. Delduca; D. Koharski; P. McNamara; C. Magatti; S. Saluja; L. Thomas
- Book ID
- 102369227
- Publisher
- John Wiley and Sons
- Year
- 1993
- Tongue
- French
- Weight
- 133 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0022-2135
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✦ Synopsis
Abstract
^3^H‐mometasone furoate was synthesized by a six step procedure. The label was introduced via the reduction and re‐oxidation of the 1,2 double bond in the A ring. The remaining 4 steps were accomplished with on overall radiochemical yield of 28%. Analysis by ^3^H nmr indicated that most of the label (≈95%) was located in the 2‐position and the remainder in the 1‐position.
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## Abstract The preparation of tritium labelled catechol by catalytic reduction of tetrabromocatechol is described. Recrystallization of catechol (U‐^3^H) after silica gel column purification gave 68% yield of the desired product with 98% purity as assayed by high performance liquid chromatography.
## Abstract The reaction conditions for the incorporation of tritium into zaleplon have been investigated. The methods studied were the catalytic isotope exchange reaction with tritium gas and catalytic isotope exchange reaction with tritiated water. The results showed that the latter method was th
## Abstract The potent __β__‐lactam antibiotic mecillinam has successfully been labelled with tritium. 2,3,4,7‐Tetrahydro‐1H‐azepin‐1‐carbaldehyde was formed in a ring‐closing metathesis reaction and then condensed with trimethylsilyl protected penicillanic acid to give dehydro‐mecillinam. Pd/C cat