Process for producing cyclopentenolones

Details Process for producing cyclopentenolones Process for producing cyclopentenolones

1979-10-30

1981-08-04

Chan, Nicky

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

562503, 568322, 568361, 26034611, 2603478, 2603474, 2603475, 2603473, 26034791, 26034849, 26034857, 26034825, C07C 4557, C07C 6700

Patent

active

042823722

ABSTRACT:
A novel process for producing cyclopentenolones, useful intermediates for producing agricultural chemicals and prostaglandins of the formula (I), ##STR1## wherein R.sub.1 is a hydrogen atom or a lower alkyl group, and R.sub.2 is a hydrogen atom, a lower alkyl, lower alkenyl or lower alkynyl group or a group of the formula, ##STR2## in which R.sub.4 is a hydrogen atom, a methyl group or a halogen atom), --CH.sub.2 --CH.dbd.CH--(CH.sub.2).sub.3 --CO.sub.2 R.sub.5, or --(CH.sub.2).sub.5 --CO.sub.2 R.sub.5 (in which R.sub.5 is a hydrogen atom or a lower alkyl group), but R.sub.1 and R.sub.2 are not a hydrogen atom at the same time, characterized in that said cyclopentenolones are derived from a starting material of the formula (III), ##STR3## through intermediates of the formulae (IV), (V) and (II), ##STR4## Many of the intermediates are novel compounds.

REFERENCES:
Elming, Adv. in Org. Chem., vol. 2, pp. 67-75 (1960).
Floyd, J. Org. Chem., vol. 43, #9, pp. 1641-1643 (1978).
Shono et al., Chem. Lett., pp. 1249-1252 (1976).

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