Highly enantioselective [3+2] annulation of 4-amino-isoxazoles with quinone monoimines to access structurally diverse isoxazoline fused dihydrobenzofurans and antifungal evaluation
The first catalytic enantioselective [3+2] cyclization between 4-amino-isoxazoles and quinonemonoimines was achieved by using a chiralphosphoricacid catalyst. This transformation afforded a series of isoxazoline fused dihydrobenzofuran derivatives with two sequential chiral centers in high yields and outstanding enantioselectivities. The absolute configuration of the title compounds was determined
Burmistrov, K. S.; Toropin, N. V.; Burmistrov, S. I., Russian Journal of Organic Chemistry, 1993, vol. 29, # 6.1, p. 970 - 973
作者:Burmistrov, K. S.、Toropin, N. V.、Burmistrov, S. I.
DOI:——
日期:——
Reactivity of N-arylsulfonyl-1,4-benzoquinone imines. Reaction with hydrazoic acid
作者:A. P. Avdeenko、Yu. V. Menafova
DOI:10.1134/s1070428006030110
日期:2006.3
N-Arylsulfonyl-2-halo-1,4-benzoquinone imines react with hydrazoic acid in boiling acetic acid via two pathways: the 1,4-addition and nucleophilic replacement of the halogen atom by an azido group, followed by the 1,4-addition of HN3. In the reaction of N-arylsulfonyl-2,6-dihalo-1,4-benzoquinone imines with hydrazoic acid, both halogen atoms are replaced by azido groups, while N-p-tolylsulfonyl-2-methyl-1,4-benzoquinone imine takes up HN3 molecule according to the 1,4-addition pattern.
Avdeenko, A. P.; Zhukova, S. A., Russian Journal of Organic Chemistry, 1999, vol. 35, # 3, p. 388 - 396