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Chiral high process for the preparation of piperazine ring (by machine translation)
The present invention relates to (R)-I high shows the chiral by the preparation method of the compound piperazine ring, the method includes a compound represented by the combined Int, the following formula (R)-I illustrated compound. The invention also refers to the new shown Int intermediate compound. (R)-I the high shows the chiral synthetic compound is piperazine ring for use in treating sleep disorders Suvorexant an important intermediate of the medicament. The preparation method of this invention from an initial raw material is introduced to the chiral center, in the process of the whole reaction, the reaction with chiral center will be affected and reagent, avoid the chiral resolution or chiral catalyst, the cost is high, the method of low yield, the participation of there are no chiral in process reaction, the chiral purity of the product, only by using a conventional method and apparatus, the operation is simple, mild condition, route is short, high yield, is suitable for industrial production. (by machine translation)
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Reference£º
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem