A Heterogeneous Gold(I)-Catalyzed [2 + 2 + 1] Annulation of Terminal Alkynes, Nitriles, and Oxygen Atoms Leading to 2,5-Disubstituted Oxazoles
作者:Weisen Yang、Rongli Zhang、Feiyan Yi、Mingzhong Cai
DOI:10.1021/acs.joc.7b00386
日期:2017.5.19
heterogeneous gold(I)-catalyzed [2 + 2 + 1] annulation of terminalalkynes, nitriles, and oxygen atoms has been achieved by using an MCM-41-immobilized phosphine–gold(I) complex as catalyst and 8-methylquinoline N-oxide as oxidant under mild conditions, yielding a variety of 2,5-disubstituted oxazoles in good to excellent yields with broad substrate scope. The new heterogeneous gold(I) catalyst can
Regioselective Formation of 2,5-Disubstituted Oxazoles Via Copper(I)-Catalyzed Cycloaddition of Acyl Azides and 1-Alkynes
作者:Israel Cano、Eleuterio Álvarez、M. Carmen Nicasio、Pedro J. Pérez
DOI:10.1021/ja109732s
日期:2011.1.19
The reaction of 1-alkynes with acyl azides in the presence of [Tpm*Cu-,Cu-Br(NCMe)]BF4 [Tpm*(,Br) = tris(3,5-dimethyl-4-bromopyrazolyl)methane] as the catalyst provides 2,5-oxazoles in moderate to high yields. This is a novel transformation of the CuAAC type that constitutes a significant variation of the commonly observed [3 + 2] cycloaddition reaction to yield 1,2,3-triazoles.
SHKUMAT A. P.; PATSENKER L. D.; ADONINA N. V.; POLYAKOV V. K.; LAVRUSHIN +, YKP. XIM. ZH., 53,(1987) N 5, 529-533
作者:SHKUMAT A. P.、 PATSENKER L. D.、 ADONINA N. V.、 POLYAKOV V. K.、 LAVRUSHIN +
DOI:——
日期:——
[EN] PHOTOACTIVE AZOLE PESTICIDES
申请人:FMC CORPORATION
公开号:WO1987006429A1
公开(公告)日:1987-11-05
(EN) Oxazole and thiazole compounds of formula (I) are photodynamic insecticides and acaricides as well as nematicides, wherein W is selected from O and S; R2 is selected from optionally substituted thienyl and optionally substituted phenyl; R4 is selected from hydrogen, lower alkyl, lower haloalkyl, thienyl, tri(lower alkyl)silyl, and optionally substituted phenyl; R5 is selected from optionally substituted thienyl and optionally substituted phenyl; at least one of R2 and R5 is an optionally substituted thienyl group, and R4 is other than hydrogen when R4 and R5 are each substituted phenyl or thienyl.(FR) Des composés d'oxazole et de thiazole sont des insecticides ainsi que des acaricides et des nématicides photodynamiques ayant la formule (I) dans laquelle W est sélectionné entre O et S; R2 est sélectionné entre un thiényle éventuellement substitué et un phényle éventuellement substitué; R4 est sélectionné parmi l'hydrogène, alkyle inférieur, haloalkyle inférieur, thiényle, tri(alkyle inférieur)silyle, et phényle éventuellement substitué; R5 est sélectionné entre un thiényle éventuellement substitué et un phényle éventuellement substitué; au moins un élément parmi R2 et R5 est un groupe thiényle éventuellement substitué, et R4 est autre qu'hydrogène lorsque R4 et R5 sont chacun phényle ou thiényle substitués.