Convenient synthesis of isoxazolines via tandem isomerization of allyl compounds to vinylic derivatives and 1,3-dipolar cycloaddition of nitrile oxides to the vinylic compounds
作者:Stanisław Krompiec、Piotr Bujak、Wojciech Szczepankiewicz
DOI:10.1016/j.tetlet.2008.07.176
日期:2008.10
effective method for the synthesis of new isoxazolines via tandem isomerization of QCH(X)CHCH(Y) to QC(X)CHCH2(Y) (Q = RO, RS, R2N, R3Si, etc.; X = H, R, OR; Y = H, R; R = alkyl, aryl) catalyzed by ruthenium complexes and 1,3-dipolar cycloaddition of the latter compounds to arenenitrile oxides is presented. The cycloaddition of QCH(X)CHCH(Y) to 2,6-dichlorobenzonitrile oxide is also described. The regio-
通过将QCH(X)CHCH(Y)串联异构化为QC(X)CHCH 2(Y)(Q = RO,RS,R 2 N,R 3 Si等; X = H,R,OR; Y = H,R; R =烷基,芳基)被钌配合物催化,并且提出了后者化合物的1,3-偶极环加成成芳族腈氧化物。还描述了QCH(X)CHCH(Y)与2,6-二氯苄腈氧化物的环加成。讨论了氮氧化物与烯丙基和1-丙烯基(通常为乙烯基)化合物的环加成反应的区域选择性和立体选择性。