摘要:
The present invention relates to a process for preparing a class of sulphonamides which are aspartyl protease inhibitors. These compounds find therapeutic use in the treatment of the human immunodeficiency virus (HIV). This virus is the causative agent for acquired immunodeficiency syndrome (AIDS). The synthetic procedure of the present invention involves a convenient and efficient process utilising base coupling, decarboxylation and reduction steps to produce the desired compounds in good yield. One advantage of the process of the present invention is its convergent approach which leads to improved yields. The procedure also enables stereoselectivity to be controlled to a high degree, thus avoiding the need for resolution procedures where chiral products are formed.
摘要:
The present invention relates to a process for preparing a class of sulphonamides which are aspartyl protease inhibitors. These compounds find therapeutic use in the treatment of the human immunodeficiency virus (HIV). This virus is the causative agent for acquired immunodeficiency syndrome (AIDS). The synthetic procedure of the present invention involves a convenient and efficient process utilising base coupling, decarboxylation and reduction steps to produce the desired compounds in good yield. One advantage of the process of the present invention is its convergent approach which leads to improved yields. The procedure also enables stereoselectivity to be controlled to a high degree, thus avoiding the need for resolution procedures where chiral products are formed.
摘要:
The present invention relates to a process for the cyanation of aldehydes, particularly to the asymmetric cyanation of aldehydes, including the synthesis of chiral cyanohydrins and derivatives thereof, such as chiral O-acyl cyanohydrins. The process of the present invention comprises: reacting the aldehyde with a cyanating agent in the presence of a chiral catalyst and less than a stoichiometric amount of an ionic cyanide source. Chiral catalysts employed in the process according to the present invention are of the formula: (1), (3a), (3b).
摘要:
The present invention relates to compounds and their use as ligands, in particular in metal catalyst complexes. The ligands of the invention are capable of binding to a solid support. The invention includes the ligands in their own right and when bound to a support and the compounds may be used to prepare metal catalyst complexes.
摘要:
The present invention relates to a novel process for obtaining (1S,4S) N-methyl-4-(3,4-dichlorophenyl)-1,2,3,4-tetrahydro-1-naphthaleneamine from a mixture of its isomers. The process involves isomerising the 1-position and the 4-position and effecting separation of the desired isomer by methods such as fractured crystallization. The process can be operated as a continuous process.
摘要:
The present invention relates to a process for the cyanation of imines, particularly to the asymmetric cyanation of imines. The Strecker reaction consists of a reaction between an aldehyde and an amine to form an imine, followed by the conversion of the imine to an alpha-amino nitrile by asymmetric catalysis. The present invention relates to a series of vanadium catalysts which allow the reduction of the imine in the Strecker reaction to be performed in good conversion and also with good ee values. The chiral catalysts are of formula (1a) or (1b).
摘要:
A process for preparing intermediate compounds useful in the preparation of statins. The process is particularly useful for the preparation of atorvastatin. The process involves the reduction of two ketone groups at the same time using either a chiral transition metal catalyst or an enzyme based system.