A direct method for the synthesis of polyfunctionalized unsaturated carbonyl derivatives by Michael addition of nitroalkanes to enediones with the help of DBU
作者:Roberto Ballini、Giovanna Bosica
DOI:10.1016/0040-4020(95)00136-v
日期:1995.4
The Michael addition of several nitroalkanes to dimethyl maleate, (Z)-3-hexene-2,5-dione, N-ethyl maleimide, and N-phenyl maleimide, in MeCN or THF, proceeds very efficiently on DBU as base, and furnishes good to high yields of polyfunctionalized unsaturated carbonyl derivatives.
A one pot, solvent-free synthesis of acyclic α-nitro ketones through the nitroaldol reaction
作者:Roberto Ballini、Giovanna Bosica、Mauro Parrini
DOI:10.1016/s0040-4039(98)01730-4
日期:1998.10
Acyclic α-nitroketones are easily obtained in one pot, through a solvent-free procedure by nitroaldol (Henry) reaction on neutral alumina, then in situ oxidation of the nitroalkanol using wet alumina supported chromium(VI) oxide.
[EN] COMPOUNDS, METHODS AND FORMULATIONS FOR THE ORAL DELIVERY OF A GLUCAGON LIKE PEPTIDE (GLP)-1 COMPOUND OR AN MELANOCORTIN 4 RECEPTOR (MC4) AGONIST PEPTIDE<br/>[FR] COMPOSES, PROCEDES ET PREPARATIONS DESTINES A L'APPORT ORAL D'UN COMPOSE PEPTIDIQUE DE TYPE GLUCAGON (GLP-1) OU D'UN PEPTIDE AGONISTE DU RECEPTEUR 4 DE MELANOCORTINE (MC4)
申请人:LILLY CO ELI
公开号:WO2005019184A1
公开(公告)日:2005-03-03
The present invention relates to novel compounds, methods, and formulations useful for the oral delivery of a GLP-1 compound or an MC4 agonist peptide.
本发明涉及用于口服给荷GLP-1化合物或MC4激动剂肽的新化合物、方法和配方。
Amberlyst A 21 as New and Efficient Surface Catalyst for the Cleavage of 2-Nitrocycloalkanones
Ring cleavage of 2-Nitrocycloalkanones with methanol/Amberlyst A 21 gave methyl Ï-nitroalkanoates, O2NCH2(CH2)nCO2Me where n = 3-6, 8-10, 13, in high yield. Subsequent Nef reaction gave the corresponding Ï-oxo compounds which were isolated, in the case of methyl 7-oxoheptanoate and methyl 8-oxooctanoate only, or reduced directly with sodium borohydride to give Ï-hydroxyalkanoates. A new formal synthesis of exaltolide (15-pentadecanolide) is also reported.
Formal Synthesis of Indolizidine and Quinolizidine Alkaloids from Vinyl Cyclic Carbonates
作者:Àlex Cristòfol、Christian Böhmer、Arjan W. Kleij
DOI:10.1002/chem.201904223
日期:2019.11.27
groups in complex multistep synthetic routes. This study shows that a concise, yet modular synthesis of indolizidine and quinolizidine alkaloids can be developed from vinyl-substituted cyclic carbonate (VCC) intermediates. Through a highly stereoselective palladium-catalyzed allylic alkylation reaction, these alkaloid motifs can be assembled in four synthetic and only two column purification steps. The