Reversal of regioselectivity with increasing ring size of alkene component in [2+2] photoadditions
作者:Gordon L. Lange、Michael G. Organ、Moses Lee
DOI:10.1016/s0040-4039(00)97707-4
日期:1990.1
Photoaddition of cyclohexenones 1a or 1b to methyl cyclobutene- (2), cyclopentene- (5) or cyclohexenecarboxylate (9) shows a gradual reversal of regioselectivity from head-to-head (3a/b) to head-to-tail adducts (11a/b). These results are inconsistent with the generally accepted dipolar interaction model.
Ring Size Effect on [2+2] Photochemical Cycloaddition of Enones with Cyclic Olefins
作者:Masahiro Tada、Yuuki Nieda
DOI:10.1246/bcsj.61.1416
日期:1988.4
Photochemical reaction of 3-substituted 2-cyclohexen-1-ones with methyl 1-cyclohexene-1-carboxylate gave only head-to-tail, cis-transoid-cis photoadduct. The photoadducts of 3-methyl-2-cyclohexen-1-one with methyl 1-cyclopentene-1-carboxylate and with methyl 1-cyclobutene-1-carboxylate had head-to-head, cis-transoid-cis ring systems.
Formal total synthesis of trichodiene via skeletal rearrangement of regioselective photochemical [2 + 2] cycloadducts from cyclohexene derivatives
作者:Yoshikazu Kitano、Junko Fukuda、Kazuhiro Chiba、Masahiro Tada
DOI:10.1039/p19960000829
日期:——
A formal total synthesis of trichodiene 1 is accomplished via the photochemical [2 + 2] cycloaddition of 3-methylcyclohex-2-enone with methyl cyclohex-1-enecarboxylate to give methyl (1α, 2β, 7β, 8α)-2-methyl-6-oxotricyclo[6.4.0.02,7]dodecan-1-carboxylate, and its skeletal rearrangement to give a tricyclo[6.4.0.02,6]dodecene derivative. Cleavage of the central five-membered ring of the tricyclo[6.4