Abstract:
A process for producing a tertiary alcohol having an adamantane skeleton which comprises reacting optionally substituted 2-adamantanone with a Grignard reagent in the presence of a rare earth halide. By the process in which optionally substituted 2-adamantanone is alkylated to produce a tertiary alcohol, the addition product can be efficiently produced in high yield while almost perfectly inhibiting the generation of reduction products.
Abstract:
A taxane analog represented by general formula (I) and a process for producing the same, wherein R represents hydrogen, acetyl, propionyl or 2-methylbutyryl; and R , R and R may be the same or different from one another and each represents hydrogen or acetyl. The invention aims at providing a novel physiologically active substance which has an NGF-like activity and the effect of enhancing the activity of NGF and facilitating the administration thereof as a remedy for Alzheimer's disease.
Abstract:
Die Erfindung betrifft ein Verfahren zur diastereomerenreinen und enantiomerenreinen Herstellung bicyclischer und tricyclischer Verbindungen durch Racematspaltung. Alkohole, Thiole oder Amine werden mit einer Dicarbonsäure oder einem Dicarbonsäurederivat und anschließende Umsetzung des erhaltenen Zwischenprodukts mit einer enantiomerenangereicherten Base in ein Salz überführt. Durch Kristallisation und anschließende Abspaltung der Dicarbonsäure wird der gewünschte Alkohol beziehungsweise das Thiol oder Amin erhalten, insbesondere eine der Verbindungen I bis III des nachfolgenden Schemas 3.
Abstract:
1,3-Dipole-functional compounds (e.g., azide functional compounds) can be reacted with certain alkynes in a cyclization reaction to form heterocyclic compounds. Useful alkynes (e.g., strained, cyclic alkynes) and methods of making such alkynes are also disclosed. The reaction of 1,3-dipole-functional compounds with alkynes can be used for a wide variety of applications including the immobilization of biomolecules on a substrate.
Abstract:
The invention relates to a method for preparing an ester, by admixing a compound having structure (I or IV) with a base and an alcohol to produce an ester, wherein the alcohol is a precursor to Taxol and its analogs. The present invention also relates to compounds having structure (I and IV) and methods of making them therefor. The invention also relates to the esterification of an alcohol by adding an alkoxide to a compound having structure (VII). The invention further relates to compounds having structure (I, IV, and VII) and methods of making them therefor. The invention further relates to alcohols, and, in particular, alcohols that are synthetic precursors to Taxol and analogs thereof.