Disclosed herein are novel prostaglandin I.sub.2 (PGI.sub.2) derivatives exhibiting excellent in vivo duration and activities, said derivatives being represented by the general formula: ##STR1## wherein R.sub.1, X, R.sub.2 and R.sub.3 are as defined herein.
Compounds of formula
as well as pharmaceutically acceptable salts and esters thereof, wherein R
1
to R
4
have the significance given in claim
1
can be used in the form of pharmaceutical compositions.
Palladium‐Catalyzed Allylation of Vinylethylene Carbonates with
<i>β</i>
‐Ketophosphonates: Stereoselective Synthesis of (
<i>Z</i>
)‐Homoallylic Phosphonates
A first simple palladiumcatalyzedallylation of vinylethylene carbonates with β‐ketophosphonates has been developed. This method provides access to (Z)‐tri‐ and tetrasubstituted homoallylic phosphonates with exclusive regioselectivity, chemoselectivity and (Z)‐stereoselectivity. The reaction tolerates a wide substrate scope of vinylethylene carbonates and β‐ketophosphonates with electron‐donating
Compounds of formula
as well as pharmaceutically acceptable salts and esters thereof, wherein R1 to R4 have the significance given in claim 1 can be used in the form of pharmaceutical compositions.
Disclosed herein are novel prostaglandin I2 (PGI2) derivatives exhibiting excellent in vivo duration and acitivities, said derivatives being represented by the general formula:
wherein R1, X, R2 and R3 are as defined herein.