A modular approach for the construction of β- and γ-lactam fused dihydropyrazinones from the readily available Ugi adducts has been described. The sequential construction of rings through base-mediated cycloisomerization followed by acid-mediated cyclization yielded β-lactam fused dihydropyrazinones. However, the Ugi-derived dihydropyrazinones afforded γ-lactam fused dihydropyrazinones under base-mediated
Diastereoselective one pot five-component reaction toward 4-(tetrazole)-1,3-oxazinanes
作者:Ajay L. Chandgude、Daniele Narducci、Katarzyna Kurpiewska、Justyna Kalinowska-Tłuścik、Alexander Dömling
DOI:10.1039/c7ra07392e
日期:——
A diastereoselective onepot five-component reaction toward the synthesis of 4-(tetrazole)-1,3-oxazinanes has been reported. The sonication-accelerated, catalyst-free, simple, general and highly time efficient, Asinger–Ugi-tetrazole reaction was used for the synthesis of diverse 4-(tetrazole)-1,3-oxazinanes. The reaction exhibit excellent diastereoselectivity and broad substrate scope.
One-pot synthesis of oxazoles using isocyanide surrogates
作者:Laurent El Kaim、Laurence Grimaud、Aurélie Schiltz
DOI:10.1016/j.tetlet.2009.07.001
日期:2009.9
We wish to present herein a simple one-potsynthesis of 2,5-disubstitutedoxazoles, starting from benzyl halides and acyl chlorides. The in situ formation of isocyanides, followed by the addition of an acyl chloride in the presence of a base leads to the desired oxazoles in good yields.
An efficient Passerini tetrazole reaction (PT-3CR)
作者:Ajay L. Chandgude、Alexander Dömling
DOI:10.1039/c6gc00910g
日期:——
A sonication accelerated, catalyst free, simple, high yielding and efficient method for the Passerini-type three-component reaction (PT-3CR) has been developed.