- Rearrangement of spiro-benzimidazolines: preparation of N-alkenyl- and N-alkyl-benzimidazol-2-ones
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A synthetically useful protocol has been developed for the preparation of highly functionalized N-alkenyl-benzimidazol-2-ones. Reaction of commercially available o-phenylenediamines with variously substituted cyclic ketones provides spiro-benzimidazolines. Treatment of these spiro-benzimidazolines with triphosgene in the presence of potassium carbonate results in rapid rearrangement and formation of N-alkenyl-benzimidazol-2-ones in modest to excellent yield for the two-step sequence. Extension of this methodology toward the preparation of a μ opiate receptor antagonist and droperidol, a potent antiemetic and antipsychotic agent, currently a marketed pharmaceutical is also described. Upon treatment of spiro-benzimidazolines with triphosgene in the presence of sodium triacetoxyborohydride, N-alkyl-benzimidazol-2-ones were formed.
- Kuethe, Jeffrey T.,Varon, Jack,Childers, Karla G.
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p. 11489 - 11502
(2008/03/13)
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- Method for inducing crystalline state transition in medicinal substance
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This invention has for its object to provide a method of inducing a transition in crystalline state of a crystallizable medicinal substance with great ease and improved efficiency and uniformity on a high production scale. According to the invention, an extruder is used for inducing a transition from one crystalline state (Δ) to another crystalline state in a crystallizable medicinal substance.
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- Phenylbutanol derivatives
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Butyrophenone derivatives having excellent psychotropic activity and represented by the formula, SPC1 Wherein A represents a single or double bond linkage; R1 represents a hydrogen atom or a C1 - C4 alkyl group; R2, which is present only in case A represents a single bond linkage, represents a hydrogen atom, or a hydroxyl, C1 - C4 alkyl, or C1 - C4 alkoxy group; R3 represents a hydrogen atom, or a piperidino, pyrrolidino, morpholino, furyl, thienyl, C1 - C4 alkylamino, benzylamino, unsubstituted or halogen-substituted phenyl group, etc.; and X represents a hydrogen or halogen atom, or a C1 - C4 alkyl, C1 - C4 alkoxy, or trifluoromethyl group, can be prepared by reducing a benzoylpropionamide derivative of the formula, SPC2 Wherein A, R1, R2, R3 and X have the same meanings as defined above, to a phenylbutanol derivative of the formula, SPC3
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