Synthesis of Resorcinols via a Michael Addition-Dieckman Cyclization Sequence of Dimethyl 1,3-Acetonedicarboxylate Anion with Alkyl Alkynoates
摘要:
The reaction of dimethyl 1,3-acetonedicarboxylate anion 1 with a number of alkyl alkynoates gives unsymmetrical (from alkynoates 2a-g) or symmetrical (from alkynoates 2h-i) resorcinols, in a one pot synthesis.
Synthesis of Resorcinols via a Michael Addition-Dieckman Cyclization Sequence of Dimethyl 1,3-Acetonedicarboxylate Anion with Alkyl Alkynoates
作者:A. Covarrubias-Zúñiga、L. A. Maldonado、E. Ríos-Barrios、A. González-Lucas
DOI:10.1080/00397919808004454
日期:1998.9
The reaction of dimethyl 1,3-acetonedicarboxylate anion 1 with a number of alkyl alkynoates gives unsymmetrical (from alkynoates 2a-g) or symmetrical (from alkynoates 2h-i) resorcinols, in a one pot synthesis.
Process for the preparation of 5-substituted resorcinols and related
申请人:Ciba-Geigy Corporation
公开号:US04020098A1
公开(公告)日:1977-04-26
According to the present invention, 5-substituted resorcinols of the formula I ##STR1## wherein R.sub.1 represents a hydrocarbon radical, optionally unsubstituted or substituted by inert substituents, are prepared by reacting a carboxylic acid ester of the formula II r.sub.1 -- c .tbd. c -- co -- o -- r.sub.2 (ii) wherein R.sub.2 represents a non-aromatically bound lower hydrocarbon radical, in the presence of an alkaline condensation agent, with a diester of 3-oxoglutaric acid of the formula III r.sub.3 --o--co--ch.sub.2 --co--ch.sub.2 --co--o--r.sub.4 (iii) wherein R.sub.3 and R.sub.4 represent non-aromatically bound lower hydrocarbon radicals; hydrolyzing the resulting dihydroxyisophthalic acid acid ester of the formula IV ##STR2## and decarboxylating the hydrolyzed product, a specific embodiment is the preparation of 5-pentylresorcinol.