Medical devices containing rapamycin analogs
a technology of rapamycin and analogs, applied in the field of immunomodulatory drugs, can solve the problems of ineffective systemic effects, severe limitations of the usefulness of new procedures, and inability to provide long-term solutions to procedures, and achieve the effect of reducing the rate of restenosis and reducing the vasculature restenosis
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In one embodiment of the invention is a compound of formula
In another embodiment of the invention is a compound of formula
Preparation of Compounds of this Invention
The compounds and processes of the present invention will be better understood in connection with the following synthetic schemes which illustrate the methods by which the compounds of the invention may be prepared.
The compounds of this invention may be prepared by a variety of synthetic routes. A representative procedure is shown in Scheme 1.
As shown in Scheme 1, conversion of the C-42 hydroxyl of rapamycin to a trifluoromethanesulfonate or fluorosulfonate leaving group provided A. Displacement of the leaving group with tetrazole in the presence of a hindered, non-nucleophilic base, such as 2,6-lutidine, or, preferably, diisopropylethyl amine provided epimers B and C, which were separated and purified by flash column chromatography.
Synthetic Methods
The foregoing may be better understood by reference to th...
example 1
42-Epi-(tetrazolyl)-rapamycin (Less Polar Isomer)
example 1a
A solution of rapamycin (100 mg, 0.11 mmol) in dichloromethane (0.6 mL) at −78° C. under a nitrogen atmosphere was treated sequentially with 2,6-lutidine (53 uL, 0.46 mmol, 4.3 eq.) and trifluoromethanesulfonic anhydride (37 uL, 0.22 mmol), and stirred thereafter for 15 minutes, warmed to room temperature and eluted through a pad of silica gel (6 mL) with diethyl ether. Fractions containing the triflate were pooled and concentrated to provide the designated compound as an amber foam.
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