Process for the preparation of 8-ethylenic carbonyl compounds
申请人:Rhone-Poulenc Sante
公开号:US04421934A1
公开(公告)日:1983-12-20
Process for the preparation of .delta.-ethylenic carbonyl compounds of the formula (I) by the oxy-Cope rearrangement of a diethylenic alcohol of the formula (II), in the presence of a mercuric salt: in formulae (I) and (II), R.sub.1, R.sub.2, R.sub.4, R.sub.5 and R.sub.6, which are identical or different, represent a hydrogen atom or an acyclic hydrocarbon radical and R.sub.3 represents an acyclic hydrocarbon radical, it being understood that R.sub.1 and R.sub.3 can together form a trimethylene radical, or alternatively that R.sub.3 and R.sub.4 can together form an alkylene radical containing 3 to 20 carbon atoms. ##STR1##
Process for the preparation of .delta.-ethylenic carbonyl compounds
申请人:Rhone-Poulenc Sante
公开号:US04510330A1
公开(公告)日:1985-04-09
Process for the preparation of .delta.-ethylenic carbonyl compounds of the formula: ##STR1## by the oxy-Cope rearrangement of a diethylenic alcohol of the formula: ##STR2## in which the transformation is carried out in the presence of a catalytic amount of a divalent palladium compound. In the depicted formulae R.sub.1, R.sub.4 and R.sub.6 each represent a hydrogen atom or a hydrocarbon radical, R.sub.2 represents a hydrogen atom and R.sub.3 and R.sub.5 each represent a hydrocarbon radical, or R.sub.3 and R.sub.4 together represent an alkylene radical (--CH.sub.2 --).sub.n (wherein n is an integer from 3 to 20 inclusive) in which one or more carbon atoms can optionally carry as substituent(s) one or more alkyl radicals containing 1 to 4 carbon atoms. The carbonyl products are useful as starting materials for the preparation of compounds intended for use in pharmacy, in agriculture or perfumery.
Transannular Enantioselective (3 + 2) Cycloaddition of Cycloalkenone Hydrazones under Brønsted Acid Catalysis
作者:Jana Sendra、Efraim Reyes、Liher Prieto、Elena Fernández、Jose L. Vicario
DOI:10.1021/acs.orglett.1c03190
日期:2021.11.19
Hydrazones derivedfrom cycloalkenones undergo an enantioselective transannular formal (3 + 2) cycloaddition catalyzed by a chiral phosphoric acid. The reaction provides high yields and excellent stereocontrol in the formation of complex adducts with one or two α-tertiary amine moieties at the ring fusion, and these can be converted into very versatile stereodefined decalin- or octahydro-1H-indene-derived