Aminocyclopentane esters and their preparation and pharmaceutical formulation
申请人:GLAXO GROUP LIMITED
公开号:EP0127930A2
公开(公告)日:1984-12-12
Compounds are described of the formulae (1a) and (1b)
in which:
-COR' is an ester group,
n is 1 or 2,
W is C1-7 alkylene,
X is cis or trans -CH=CH or -CH2CH2-,
Y is a saturated heterocyclic amino group,
R2 is substituted or unsubstituted phenylalkyl, thienylal- kyl or naphthylalkyl or cinnamyl, and
R' is -H or C1-5 alkanoyl,
including their salts.
These compounds inhibit blood platelet aggregation and bronchoconstriction and may be formulated for use as antithrombotic or antiasthmatic agents.
The protocol of lithiation by means of lithium and a catalytic (5% molar) amount of DTBB (4,4’-di-tert-butylbiphenyl), applied to ω-chloro ortho ester 6 under Barbier-type conditions gives, after final acid-catalyzed methanolysis, the corresponding functionalized esters 8 or 9 (for chlorotrimethylsilane as electrophile) or, after ortho ester deprotection and acid catalyzed treatment, the δ-lactones 11. The procedure is also practical for bicyclic ortho esters 14: the β-chloro OBO ester derivate generates the γ- lactones 15 and the γ-chloro OBO ester gives corresponding esters 8.
Carbocyclic ring expansion reactions via radical chain processes. Part II.
作者:Jack E. Baldwin、Robert M. Adlington、Jeremy Robertson
DOI:10.1016/s0040-4020(01)82331-0
日期:1991.8
The further exploitation of the homolytic ringexpansionreaction of cyclohexanone derivatives is described. The application of this methodology to the preparation of exomethylene cycloalkanones, α-alkylated cyclodecanones, indanones, and decalinols is described.