Synthesis of leprapinic acid, calycine and analogues by sequential “[3+2] cyclization/Suzuki/lactonization” reactions was written by Ahmed, Zafar;Albrecht, Uwe;Langer, Peter. And the article was included in European Journal of Organic Chemistry in 2005.HPLC of Formula: 106675-70-1 This article mentions the following:
Calycine (I) and analogs were prepared on the basis of Suzuki cross-coupling reactions of γ-alkylidene-α-hydroxybutenolides, readily available by cycloaddition of 1,3-dicarbonyl dianions or 1,3-bis(silyl enol ether)s with oxalyl derivatives, and subsequent boron tribromide-mediated lactonization. Leprapinic acid (II) was prepared by chemoselective boron tribromide-mediated deprotection of permethylated leprapinic acid. In the experiment, the researchers used many compounds, for example, N1,N2-Dimethoxy-N1,N2-dimethyloxalamide (cas: 106675-70-1HPLC of Formula: 106675-70-1).
N1,N2-Dimethoxy-N1,N2-dimethyloxalamide (cas: 106675-70-1) belongs to amides. In primary and secondary amides, the presence of N–H dipoles allows amides to function as H-bond donors as well. Thus amides can participate in hydrogen bonding with water and other protic solvents; the oxygen atom can accept hydrogen bonds from water and the N–H hydrogen atoms can donate H-bonds. Amides can be freed from solvent or water by drying below their melting points. These purifications can also be used for sulfonamides and acid hydrazides.HPLC of Formula: 106675-70-1
Referemce:
Amide – Wikipedia,
Amide – an overview | ScienceDirect Topics