Gruppo Lepetit

The Dow Chemical Company

Pierrel Spa

Duccio Favara

Umberto Guzzi

Francis Johnson

Kenneth G Paul

Pietro Consonni

Silvano Casadio

Amedeo Omodei-Sale'

Amedeo Omodei-Sale

Ezio Panto

New 8-substituted nucleoside and purine derivatives of the general formula: ##STR1## wherein R represents an amino group or an hydroxy group possibly in the corresponding keto tautomeric form, R.sub.1 is hydrogen or an amino group, R.sub.2 is hydrogen or a .beta.-D-ribofuranosyl radical wherein the primary hydroxy group and/or the two secondary hydroxy groups may be derivatized, R.sub.3 is an optionally substituted aryl or monocyclic heteroaryl radical and, X is --O-- or --S--. The new compounds have antihyperlipaemic activity.

New 8-substituted nucleoside and purine derivatives, the process for the

New .beta.-lactam acetic acid derivatives I ##STR1## wherein R represents alkyl, alkyl substituted with amino, protected amino, mono- or di-alkylamino, hydroxy, protected hydroxy or alkoxy, and alkenyl, and their salts are useful as intermediates for preparing 1-azabicyclo [3.2.0]hept-2-ene antibiotics II ##STR2## The process for preparing the .beta.-lactam acetic acid derivatives I as well as the overall process which starting from the acids I leads to the antibiotics II are also claimed.

Novel .beta.-lactam acetic acid derivatives

Prostaglandin derivatives wherein the atom at the position 13 of the lower side-chain is replaced by nitrogen. The new compounds have abortifacient activity.

13-Azaprostaglandins

Intermediates for prostaglandins are synthesized from racemic malic acid and enantiomeric d- and l-malic acid derivatives. The novel synthesis of this invention offers the possibility of a stereoselective control of the reaction products to give optically-active derivatives.

Intermediates for prostaglandins

Methyl dl-jasmonate and related compounds, which are useful in perfumery, are synthesized by alkylation of a 2-carbo(lower alkoxy)-3-oxocyclopentaneacetic acid lower alkyl ester. A new method for the synthesis of the intermediates, 2-carbo(lower alkoxy)-3-oxocyclopentene-1-acetic acid lower alkyl esters, is also described.

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Como, Italy

Duccio Favara