Synthesis of (2R, 5S)- and (2S, 5S)-2-carboxy-1,4-diaza-[4.3.0]bicyclononane as building blocks for the synthesis of new potential HIV protease inhibitors
摘要:
A procedure for the preparation of optically active (2R,5S)- and (2S,5S)-2-Carboxy-1,4-diaza-[4.3.0]bicyclononane is described. The method is based on the reduction of diketopiperazines obtained from cyclization of Pro-L-Ser or Pro-D-Ser and occurs without loss of enantiomeric purity. The synthesis is based on readily available starting materials and can be easily arranged for multigram scale preparations. Copyright (C) 1996 Elsevier Science Ltd
Chiral ligands containing heteroatoms. 11. Optically active 2-hydroxymethyl piperazincs as catalysts in the enantioselective addition of diethylzinc to benzaldehyde
(2R,5S) and (2S,5S)-2-hydroxymethyl-5-alkyl piperazines 1–5 were prepared in good yields without any racemization. The use of these compounds as chiral catalysts for the enantioselectiveaddition of diethylzinc to aldehydes is described. This paper reports the first example of the use of piperazine methanols in asymmetric synthesis.
The present invention provides compounds for modulating protein kinase enzymatic activity for modulating cellular activities such as proliferation, differentiation, programmed cell death, migration and chemoinvasion. More specifically, the invention provides quinazolines and quinolines which inhibit, regulate and/or modulate kinase receptor, particularly c-Met, KDR, c-Kit, flt-3 and flt-4, signal transduction pathways related to the changes in cellular activities as mentioned above, compositions which contain these compounds, and methods of using them to treat kinase-dependent diseases and conditions. The present invention also provides methods for making compounds as mentioned above, and compositions which contain these compounds.
Synthesis of (2R, 5S)- and (2S, 5S)-2-carboxy-1,4-diaza-[4.3.0]bicyclononane as building blocks for the synthesis of new potential HIV protease inhibitors
A procedure for the preparation of optically active (2R,5S)- and (2S,5S)-2-Carboxy-1,4-diaza-[4.3.0]bicyclononane is described. The method is based on the reduction of diketopiperazines obtained from cyclization of Pro-L-Ser or Pro-D-Ser and occurs without loss of enantiomeric purity. The synthesis is based on readily available starting materials and can be easily arranged for multigram scale preparations. Copyright (C) 1996 Elsevier Science Ltd