(±)-Stemoamide (1) was prepared in seven steps beginning with γ-chlorobutryl chloride (20) and succinimide (15), which were efficiently converted to the key alkyne oxazole 17 on a multigram scale. Intramolecular (Diels−Alder)−(retro-Diels−Alder) reaction of 17 then gave butenolide 12b directly upon aqueous workup. The remaining two stereocenters in 1 were established in a single step by a highly selective
Synthesis and Cytotoxicity on Sensitive and Doxorubicin-Resistant Cell Lines of New Pyrrolo[2,1-<i>c</i>][1,4]benzodiazepines Related to Anthramycin
作者:Nicole Langlois、Anne Rojas-Rousseau、Christiane Gaspard、Georges H. Werner、Francis Darro、Robert Kiss
DOI:10.1021/jm010937q
日期:2001.10.1
water-soluble sodium bisulfite derivative (15) have been synthesized in high yields and have been shown to exhibit high cytotoxic activities against several tumor cell lines. The new pyrrolo[2,1-c][1,4]benzodiazepine 4 was as effective against the resistant cell lines as against the doxorubicin-sensitive cell lines tested.
1,3-Dipolar cycloadditions of nitrones to α,β-unsaturated γ-lactams derived from (S)-pyroglutaminol
作者:Nicole Langlois、Nguyen Van Bac、Nathalie Dahuron、Jean-Marc Delcroix、Abdallah Deyine、Dominique Griffart-Brunet、Angèle Chiaroni、Claude Riche
DOI:10.1016/0040-4020(95)00100-m
日期:1995.3
α,β-Unsaturated γ-lactams undergo regio- and stereoselective 1,3-dipolar cycloadditions with N-benzyl and N-methyl nitrones and can act as acceptors in conjugateaddition of N-methylhydroxylamine. These reactions give access to highly functionalized pyrrolidones.
A short synthesis of C-2 symmetric (2S, 5S) pyrrolidine-2,5 dicarboxylic acid, a constituent of red alga Schizymenia dubyi
作者:Nicole Langlois、Anne Rojas
DOI:10.1016/s0040-4020(01)80507-x
日期:1993.1
(2S, 5S) pyrrolidine-2,5-dicarboxylic acid 1 was synthesized from (5S) N-methoxycarbonyl-5-ethoxyethoxy-methyl pyrrolidin-2-one 2 by a simple and efficient way. 1