Hypervalentiodineoxidation of -silylated -substituted phenols by phenyliodosyl bis (trifluoroacetate) (PIFA) in 2,2,2-trifluoroethanol gave azacarbocyclic spirodienones inn good yields.
A New H<sub>2</sub>O<sub>2</sub>/Acid Anhydride System for the Iodoarene-Catalyzed C−C Bond-Forming Reactions of Phenols
作者:Toshifumi Dohi、Yutaka Minamitsuji、Akinobu Maruyama、Satoshi Hirose、Yasuyuki Kita
DOI:10.1021/ol801321f
日期:2008.8.21
We have succeeded in the first versatile iodoarene-catalyzed C-C bond-forming reactions by development of a new reoxidation system at low temperatures using stoichiometric bis(trifluoroacetyl) peroxide A in 2,2,2-trifluoroethanol (TFE). The catalytic system supplies a wide range of substrates and functional availabilities sufficient to be used in the key synthetic process of producing biologically important Amaryllidaceae alkaloids.
KITA, YASUYUKI;YAKURA, TAKAYUKI;TOHMA, HIROFUMI;KIKUCHI, KAZUMI;TAMURA, Y+, TETRAHEDRON LETT., 30,(1989) N, C. 1119-1120
A Biomimetic Approach to the Discorhabdin Alkaloids: Total Syntheses of Discorhabdins C and E and Dethiadiscorhabdin D
作者:Kelly Marshall Aubart、Clayton H. Heathcock
DOI:10.1021/jo9815397
日期:1999.1.1
The characteristic spirodienone structure of the discorhabdin alkaloids is readily formed by reaction of the tyramine-substituted indoloquinonimines 26, 35, and 36 with cupric chloride, triethylamine, and oxygen. This cyclization provides a possibly biomimetic route to discorhabdins C and E (41 and 42). The unbrominated spirodienone 40 reacts with hydrogen over Pd/C to give enone 46. Bromination at