Intermediate for thiol based collagenase inhibitors
申请人:G. D. Searle & Co.
公开号:US04681966A1
公开(公告)日:1987-07-21
This invention relates to compounds of the formula ##STR1## wherein R.sub.1 represents lower alkyl, phenyl, or phenyl lower alkyl; R.sub.2 represents lower alkyl; and R.sub.5 represents lower alkyl. These compounds are useful as intermediates in the preparation of collagenase inhibiting compounds which are useful in the treatment of arthritis and are of the formula ##STR2## wherein R.sub.1 represents lower alkyl, phenyl or phenyl lower alkyl; R.sub.2 and R.sub.4 represent lower alkyl; and R.sub.3 represents lower alkyl, benzyloxyalkyl, alkoxybenzyl or benzyloxybenzyl wherein the oxyalkyl or alkoxy moiety contain 1 to 6 carbon atoms; and a, b, and c represent chiral centers with optional R or S stereochemistry.
Regioselectivity of rhodium(II)-catalyzed decomposition of 1-alkyl-1-(diazoacetyl)alkenes. Synthesis of 2-alkyl-2-cyclopentenones and 2-alkylidenecyclopentanones
The synthesis of 1-alkyl-1-(diazoacetyl)alkenes and their dirhodium tetraacetate catalyzed transformation into 2-cyclopentenones and 2-alkylidenecyclopentanones are described. The competitive, intramolecular carbon-hydrogen insertion at two gamma-centers is discussed.
US4595700A
申请人:——
公开号:US4595700A
公开(公告)日:1986-06-17
US4681966A
申请人:——
公开号:US4681966A
公开(公告)日:1987-07-21
Harkin, Shaun A.; Singh, Onkar; Thomas, Eric J., Journal of the Chemical Society. Perkin transactions I, 1984, # 7, p. 1489 - 1499