Providing storage is as stated on the product vial and the vial is kept tightly sealed, the product can be stored for up to
24 months(2-8C).
Wherever possible, you should prepare and use solutions on the same day. However, if you need to make up stock solutions in advance, we recommend that you store the solution as aliquots in tightly sealed vials at -20C. Generally, these will be useable for up to two weeks. Before use, and prior to opening the vial we recommend that you allow your product to equilibrate to room temperature for at least 1 hour.
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The packaging of the product may have turned upside down during transportation, resulting in the natural compounds adhering to the neck or cap of the vial. take the vial out of its packaging and gently shake to let the compounds fall to the bottom of the vial. for liquid products, centrifuge at 200-500 RPM to gather the liquid at the bottom of the vial. try to avoid loss or contamination during handling.
Science China-Chemistry, 2013, 57(2):252-264.
A novel and versatile method for the enantioselective syntheses of tropane alkaloids.[Reference:
WebLink]
METHODS AND RESULTS:
A full account of the novel and flexible approach to hydroxylated 8-azabicyclo[3,2,1]octan-3-ones and 9-azabicyclo[3,3,1] nonan-3-ones is presented. Using keto-lactams as the starting materials, this two-step method consists of silyl enol ether formation with TBDMSOTf, lactam activation with Tf2O/DTBMP, and halide-promoted cyclization. Radical dechlorination of the resulting 1-halotropan-3-ones led to the corresponding hydroxylated tropan-3-ones, which can be hydrogenated to yield 3α,6β-dihydroxytropanes.
CONCLUSIONS:
Starting from optically active keto-lactams, the method has been applied to the enantioselective syntheses of (+)-(1S,3S,5R,6S)-pervilleine C (6), (+)-(1S,3R,5S,6R)-Valeroidine (3), (+)-(1S,3S,5R,6S)-dibenzoyloxytropane (8), and (+)-(1S,3S,5R,6S)-merredissine (9).
