FREMGANGSMADE TIL FREMSTILLING AF CYCLOPENTANDERIVATER

1497829 11-Deoxyprostaglandins MAY & BAKER Ltd 20 April 1976 [21 April 1975] 16429/75 Heading C2C [Also in Division C3] The invention comprises 11-deoxyprostaglandins of the formula wherein R1 is H or C 1-15 alkyl; A is C 1-12 alkylene; Y is carbonyl or hydroxymethylene, n is 4, 5 or 6 and either (i) Z is a direct bond and R7 is H or alkyl or an aryl or heteroaryl which may be substituted by one or more substituents selected from halogen atoms, alkyl, haloalkyl, alkenyl, alkoxy, alkenyloxy, alkoxycarbonyl, hydroxy, cyano, nitro, sulphamoyl, mono- or di-alkyl sulphamoyl, carbamoyl, mono- or dialkylcarbamoyl and dialkylamino, or else (ii) Z is O or S, and R2 is alkyl or an aryl or heteroaryl group which may be substituted by one or more substitutents selected from halogen atom, alkyl, haloalkyl, alkenyl, alkoxy, alkenyloxy, alkoxycarbonyl, hydroxy, cyano, nitro, sulphamoyl, mono- or di-alkyl sulphomoyl, carbamoyl, mono- or di-alkylcarbamoyl, alkanoylamino and dialkylamino, and the vinylene groups in the side-chains are both in transconfiguration and cyclodextrin clathrates thereof and when R1 is H, non-toxic salts thereof, and their preparation. The compounds of the above Formula I in which Y is hydroxymethylene are prepared by reducing the corresponding compounds in which Y is carbonyl, which are obtained by hydrolysing compounds of the Formula V wherein the symbols R4 are identical alkyl groups or together form an ethylene linkage optionally substituted by one identical alkyl group on each carbon atom. The free acids may be obtained by the hydrolysis of the corresponding C 1-15 alkyl esters and the esters prepared by esterification of the appropriate acids. The following intermediates are also prepared: 6 - (7 - hydroxyheptyl) - 7 - (3 - oxooct - trans- 1 - enyl) - 1,4 - dioxaspiro[4,4]nonane; 6 - (7- hydroxyheplyl) - 7 - [3 - oxo - 4 - phenoxy (or p - chlorophenoxy) - but - trans - 1 - enyl] - 1,4- dioxaspiro[4,4]nonane; 6 - (6 - formylhexyl) - 7 - (3 - oxooct - trans - 1 - enyl) - 1,4 - dioxaspiro- [4,4]nonane; 6 - (6 - formylhexyl) - 7 - [3 - oxo- 4 - phenoxy (or p - chlorophenoxy) - but - trans - 1 - enyl] - 1,4 - dioxaspiro[4,4] - nonane; 6 - (8 - ethoxycarbonyl - oct - trans - 7 - enyl)- 7 - (3 - oxooct - trans - 1 - enyl) - 1,4 - dioxaspiro[4,4]nonane; 6 - (8 - ethoxycarbonylocttrans - 1 - enyl) - 7 - [3 - oxo - 4 - phenoxy (or p - chlorophenoxy) - but - trans - 1 - enyl] - 1,4- dioxaspiro[4,4]nonane; compounds of Formula V above; and 1-chloro-3-(p-