Tandem Anionic 5-Exo Dig Cyclization/Claisen Rearrangement as an Efficient Route to Fused Polycyclic Ring Systems
作者:Timo V. Ovaska、Jonathan B. Roses
DOI:10.1021/ol006139w
日期:2000.7.1
The scope and limitations of a tandem 5-exo dig cyclization/Claisen rearrangement sequence involving appropriately substituted 4-alkyn-1-ols as an efficient "one-pot" route to fused tricyclic ring systems is described. The reaction rates were found to be strongly dependent on the nature of the terminal substitutent of the triple bond. In some cases the entire sequence was found to proceed in good yield
SAHA, MANASI;NICHOLAS, K. M., ISRAEL J. CHEM., 1984, 24, N 2, 105-107
作者:SAHA, MANASI、NICHOLAS, K. M.
DOI:——
日期:——
IMI, KATSUHARU;IMAI, KUMIKO;UTIMOTO, KIITIRO, TETRAHEDRON LETT., 28,(1987) N 27, 3127-3130
作者:IMI, KATSUHARU、IMAI, KUMIKO、UTIMOTO, KIITIRO
DOI:——
日期:——
Regioselective hydration of alkynones by palladium catalysis
作者:Katsuharu Imi、Kumiko Imai、Kiitiro Utimoto
DOI:10.1016/s0040-4039(00)96302-0
日期:1987.1
Diketones are regioselectively prepared from alkynyl ketones under mild conditions by palladium catalysis; 5-heptyn-2-one and 2-(2-nonynyl)cyclohexanone give 1,4-dikektones whereas 2-(2-heptynyl)cyclopentanone and 5,6-didehydroprostaglandin E2 methyl ester afford 1,5-diketones.
Route Scouting towards a Methyl Jasmonate Precursor
作者:Christian Chapuis、Eric Walther、Fabrice Robvieux、Claude-Alain Richard、Laurent Goumaz、Jean-Yves de Saint Laumer
DOI:10.1002/hlca.201500257
日期:2016.2
For the synthesis of methyl jasmonate (1), via the strategic intermediates 3, 4, and 6a, we constructed a synthetic network via the diverse intermediates 7–10, 13, 14, 17, and 18. This allowed us to compare the efficiency of more than 20 novel routes. The most productive pathway with a total yield of 38% is represented by the sequence→5a→5m→13b→13a→6a→4 and proceeds via sequential bromination, basic