[EN] THIADIAZOLYL-OXIMINOACETIC ACID DERIVATIVE COMPOUNDS<br/>[FR] COMPOSÉS DÉRIVÉS DE L'ACIDE THIADIAZOLYL-OXYMINOACÉTIQUE
申请人:MERCK SHARP & DOHME
公开号:WO2016100897A1
公开(公告)日:2016-06-23
Thiadiazolyl-oximinoacetic acid derivatives have been synthesized, which are useful in the manufacture of cephalosporin antibiotic compounds. Compound (1 ) (TATD) is commercially available (CAS No. 76028-96-1 ). It has now been discovered that the thiadiazolyl-oximinoacetic acid derivative compound (1 ) (TATD) can be prepared from dimethyl malonate (SM 1, CAS No. 108-59-8) according to methods described herein. The methods provide products having desirable purity.
作者:Thomas B. Poulsen、Carlos Alemparte、Karl Anker Jørgensen
DOI:10.1021/ja0539847
日期:2005.8.24
based on organocatalysis has been developed. Using a commercially available organocatalyst we demonstrate a direct highly enantioselective allylic electrophilic functionalization of alkylidenecyanoacetates and malononitriles with azodicarboxylates. The reaction is broad in scope and proceeds in high yields and with enantioselectivities up to 99%. Furthermore, we demonstrate the synthetic utility of the
Total syntheses of tacamine-type indole alkaloids of Tabernaemontana eglandulosa
作者:David Din Belle、Arto Tolvanen、Mauri Lounasmaa
DOI:10.1016/0040-4020(96)00663-1
日期:1996.8
Total syntheses are described for seven tacamine-type indolealkaloids (1–7) found in Tabernaemontana eglandulosa. (±)-Tacamine (1), (±)-16-epitacamine (2), and (±)-apotacamine (3) were prepared from pentacyclic intermediates 18. Apotacamine (3) was also obtained from aldehyde 12via epimerization of 20-epiapotacamine (19) by the Polonovski-Potier reaction. Homologation of ester 13 led to 20-epitacamonine