1,4-dihydropyridine compounds with PAF-antagonistic activity
申请人:Alter, S.A.
公开号:US05298619A1
公开(公告)日:1994-03-29
4-alkyl-1,4-dihydropyridines with activity antagonistic of the PAF-"acether" of formula (I) are described, in which R is a saturated alkyl chain C1-2; R' is a saturated or unsaturated C1-16 lineal, branched or cyclic chain that can be interrupted by an oxygen atom and can also represent a 2-(N-morpholine) ethyl group; n is 2 or 3, X is oxygen, sulphur or SO2; Ar represents an aromatic ring that cannot be phenyl when X=S and n=2. The compounds (I) can be prepared (a) by reaction of (II) with (III) and with (IV); or (b) by reacting (V) with (VI) and (IV); or (c) by reaction of (VII) with (VI). In these formulas the different radicals have the meaning given above. Compounds of formula (I) are used for the treatment of pathologic states and disorders in which the PAF-"acether" participates, being used, for example, in treatment of inflammatory processes, psoriasis, glomerulitis, transplant rejection, acute and chronic bronchitis, bronchial asthma, states of shock and allergies Likewise it is used for the treatment of pathologic states and disorders in which it is necessary to stimulate the cellular immunity such as in immunodeficient syndromes and other situations in which the defense capacity is reduced. ##STR1##
Novel photochemical rearrangements of dihydro-1,3-thiazines
作者:Shameem H. Bhatia、David M. Buckley、Richard W. McCabe、Anthony Avent、Robert G. Brown、Peter B. Hitchcock
DOI:10.1039/a705331b
日期:——
The 4-methyl compound rearranges to a thiazolidine, which co-exists as an imino-tautomer in solution. The 4-ethyl derivative gives essentially a single isomer of an acyclic thioamido-diene, whilst the 4-benzyl derivative gives a mixture of all four possible thioamido-dienes. The 4-phenyl derivative gave a skeletally rearranged 2,5-dihydro-6H-1,3-thiazine which slowly rearranged to the corresponding
合成了一系列的4-烷基或4-苯基取代的2,3-二氢-6 H -1,3-噻嗪-5-羧酸酯,并在甲苯中光解。4-甲基化合物重排为噻唑烷,噻唑烷在溶液中以亚氨基互变异构体形式共存。4-乙基衍生物基本上给出了无环硫代酰胺基-二烯的单一异构体,而4-苄基衍生物给出了所有四种可能的硫代酰胺基-二烯的混合物。4-苯基衍生物产生骨架重排的2,5-二氢-6 H -1,3-噻嗪,其缓慢重排为相应的2,3-二氢-6 H -1,3-噻嗪。
Cycloaddition of Cross-Conjugated Trienes to Halogenated Quinones
作者:Michel Couturier、Paul Brassard
DOI:10.1055/s-1994-25553
日期:——
The chemoselectivity of [4 + 2] cycloadditions involving electronrich cross-conjugated trienes and halogenated quinones has been examined. The approach provides improved preparations of 6-acetyl-2,3,7-trihydroxyjuglone, solorinic and norsolorinic acids, and averythrin. It also confirms the structure proposed for haematommone and 3,8-dihydroxy-4-methoxy-2-methoxycarbonyl-1-methyl-anthraquinone but invalidates that of sopheranin.
Photocycloaddition-fragmentation route to quinanes: Alternate fragmentation pathways
作者:Viresh H Rawal、Claire Dufour、Seiji Iwasa
DOI:10.1016/0040-4039(94)02159-9
日期:1995.1
We describe here a new type of fragmentationpathway leading to diquinane skeletons, where the normal reactivity of the systems is dramatically altered by a suitably positioned radical stabilizing groups.