Crystalline forms of a hexahydro-diazocinonaphthyridine trione compound are disclosed. The compound and its crystalline forms thereof are HIV integrase inhibitors useful for the prophylaxis or treatment of HIV infection or for the prophylaxis, treatment or delay in the onset or progression of AIDS.
Chiral Preparation of (<i>R</i>)- and (<i>S</i>)-3-(Benzyloxy)-4,4-dimethyl-1-pentene
作者:Masayuki Ito、Chihiro Kibayashi
DOI:10.1055/s-1993-25817
日期:——
Facile routes for the preparation of an optically active allylic ether bearing the tert-butyl group at an allylic chiral center, i.e. 2-(benzyloxy)-3,3-dimethyl-1-pentene, in both (R)- and (S)-enantiomeric forms, which are expected to be promising, efficient dipolarophiles in highly stereoselective asymmetric nitrone cycloaddition, have been developed, utilizing commercially available L-tert-leucine and (R)-pantolactone, respectively, as chiral precursors.
Stereoisomers of compounds of Formula I are disclosed: wherein V
1
, V
2
, R
5a
, R
5b
, R
5c
, R
8
and R
9b
are defined herein and wherein the stereoisomer contains 2 chiral centers in the 8-membered ring and one of the chiral centers is due to the presence of a chiral ring carbon. The isomers are inhibitors of HIV integrase and inhibitors of HIV replication, and are useful for the prophylaxis or treatment of infection by HIV and the prophylaxis, treatment, or delay in the onset or progression of AIDS. The compounds are employed against HIV infection and AIDS as compounds per se or in the form of pharmaceutically acceptable salts. The compounds and their salts can be employed as ingredients in pharmaceutical compositions, optionally in combination with other antivirals, immunomodulators, antibiotics or vaccines.
Enantioselective hydrogenation of pyrrolidine-2,3,5-triones over the Pt–cinchonidine system
作者:A Szabo、N Künzle、T Mallat、A Baiker
DOI:10.1016/s0957-4166(98)00499-6
日期:1999.1
1- and I-Substituted pyrrolidine-2,3,5-triones 5, 6 and 9 have been synthesized and hydrogenated to 3-hydroxy derivatives 10-12 with 17-91% ee using a 5 wt% Pt/Al2O3 catalyst in the presence of small amounts of cinchonidine. The influence of substituents on the enantioselectivity is discussed. (C) 1999 Elsevier Science Ltd. All rights reserved.