Synthesis of azulenes by the [6 + 4] cycloadditions of 6-aminofulvenes to thiophene S,S-dioxides
作者:Stephen E. Reiter、Lee C. Dunn、K. N. Houk
DOI:10.1021/ja00454a070
日期:1977.6
........ 21 C. F u l v e n e s ................................................... 24 1. Theoretical Rationales of Periselectivity ........... 24 2. Synthesis of Arainofulvenes........................... 28 3. Reactions of A m i n o f u l v e n e s ........................... 29 II. Results and Discussion........................................ 32 A. Preparation of Thiophene Dioxides .............
1-(3-Sulfolen-3-yl)pyridinium bromide (5) and 1-(3-methyl-2-sulfolen-4-yl)pyridinium bromide (35) have been prepared and served as the stable precursors for the cation-substituted dienes 6a and 32a, respectively. Compounds 6a and 32a are reactive dienes in the Diels-Alder reactions with a number of electron-poor dienophiles. Some [4 + 2] cycloadditions of 66 and 32a can take place in water.
CHOU, TA-SHUE;HUNG, SU-CHUN, J. ORG. CHEM., 53,(1988) N 13, C. 3020-3027
作者:CHOU, TA-SHUE、HUNG, SU-CHUN
DOI:——
日期:——
Selective cross Diels-Alder reactions of 2-(phenylsulfonyl) 1,3-dienes