Process for preparing allenic prostanoic acid derivatives

Details Process for preparing allenic prostanoic acid derivatives Process for preparing allenic prostanoic acid derivatives

C - Chemistry, Metallurgy

07

D

260/235.03, 260/

C07D 309/12 (2006.01) C07C 405/00 (2006.01) C07F 7/18 (2006.01)

Patent

CA 2005243

26450-FF ABSTRACT OF THE DISCLOSURE This invention relates to a novel process for making an allenic prostanoic acid derivative in the form of a single stereoisomer, or a mixture of stereoisomers, represented by the formula (I): Image (I) wherein R is lower alkyl, R1 is a protecting group which can be selectively removed in the presence of R2, R2 is an acid-labile, base-stable protecting group, X is -(CH2)2- , trans -CH=CH- or -C?C-, Y is -C(R3)(OR2)CH2-, in which -OR2 is in the .alpha. or .beta. configuration and R3 is hydrogen or methyl, Z is alkyl, or phenyl, benzyl or phenoxy each optionally substituted on the phenyl ring, and the wavy lines represent the .alpha. or .beta. configuration with the proviso that when one wavy line is a the other is .beta..

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