1,3-Dipolar cycloaddition reactions of substituted 3,4-dihydroisoquinoline N-oxides with allenes
作者:Bao-Xiang Zhao、Shoji Eguchi
DOI:10.1016/s0040-4020(97)00642-x
日期:1997.7
study of the 1,3-dipolarcycloaddition behavior of a series of substituted 3,4-dihydroisoquinoline N-oxides with electron-deficient allenes has been carried out. The 1,3-dipolarcycloaddition reaction proceeds in high yield with complete regioselectivity to give 5-methylene isoxazolidines. The stability of these 5-methylene isoxazolidines was depending on the structure of nitrones and allenes.
PREPARATION OF R-(+)-3,4-DIMETHOXYBENZYL 2-METHOXY-1-NAPHTHYL SULFOXIDE AND DIASTEREOSELECTIVE ADDITION OF LITHIATED ANION OF THIS REAGENT TO CYCLIC NITRONE. ASYMMETRIC SYNTHESIS OF OPTICAL PURE ISOQUINOLINE ALKALOIDS
作者:A. R. Hajipour、M. Hantehzadeh
DOI:10.1080/10426500008042106
日期:2000.6.1
was easily prepared by the reaction of 3.4-dimethoxyben-zylmagnesium chloride 2 with (-)-(S)menthyl 2-methoxy-naphthalenesulfinate 1 in dry benzene. This methodology allows for the synthesis of the isoquinolinealkaloid (R)-(-)-norlaudanosine 8 in three efficient synthetic steps.
SYNTHESIS OF NITRONES FROM 3,4-DIHYDROISOQUINOLINE DERIVATIVES BY OXIDATION WITH<i>m</i>-CHLOROPEROXYBENZOIC ACID
作者:Bao-Xiang Zhao、Yang Yu、Shoji Eguchi
DOI:10.1080/00304949709355182
日期:1997.4
Synthesis of stable Δ4-isoxazolines by 1,3-dipolar cycloaddition of 3,4-dihydroisoquinoline N-oxides with alkynes and their rearrangement to isoquinoline-fused pyrroles
作者:Bao-Xiang Zhao、Yang Yu、Shoji Eguchi
DOI:10.1016/0040-4020(96)00698-9
日期:1996.9
Novel stable 4-substituted Δ4-isoxazoline derivatives were obtained by cycloaddition reaction of isoquinoline N-oxides with alkynes. The thermal reaction of some 4-isoxazoline derivatives leading to isoquinoline-fused pyrroles was investigated and it was found that the pathway of the rearrangement to pyrroles is consistent with the way involving acylaziridine.