Novel Base-Promoted Rearrangement of 2-(4-Cyano-, 2-Nitro-, and 4-Nitrobenzyloxy)tropones and 2-(2-Oxo-2-phenethyloxy)tropone to 2-[(4-Cyano-, 2-Nitro-, and 4-Nitrophenyl)hydroxymethyl]tropones and 2-(1-Hydroxy-2-oxo-2-phenethyl)tropone
AN ANION-PROMOTED REARRANGEMENT OF 2-(<i>o</i>- AND<i>p</i>-NITROBENZYLOXY)TROPONES TO α-HYDROXYLATED 2-(<i>o</i>- AND<i>p</i>-NITROBENZYL)TROPONES. A READY INTRODUCTION OF ARALKYL GROUP INTO THE TROPONOID NUCLEUS
作者:Hitoshi Takeshita、Akira Mori、Hiroshi Suizu
DOI:10.1246/cl.1986.593
日期:1986.4.5
During the preparation of 2-(o- and p-nitrobenzyloxy)tropones from o- and p-nitrobenzyl chlorides and potassium tropolonate, a concomittant formation of α-hydroxylated 2-(o- and p-nitrobenzyl)tropones and 3-(o- and p-nitrobenzyl)tropolones was recognized. This alkali-promoted reaction has no precedent analogy in the troponoid chemistry. From the 2-(p-nitrobenzoyl)tropone, a tetrahydrobenzodiazaheptalenone, 6-(p-nitrophenyl)-5,7,11a,12-tetrahydrocyclohepta[b](1,5)benzodiazepin-7-one, was prepared.
Synthetic Photochemistry. XXXIX. Sensitized-Photooxygenation of 2-Benzyltropone, 2-[Hydroxy(4-nitrophenyl)methyl]tropone, and 2-(1-Hydroxy-2-oxo-2-phenylethyl)tropone. A Quenching Effect of Hydroxyl Group in the Vicinity of the Reaction Site
作者:Akira Mori、Hiroshi Suizu、Hitoshi Takeshita
DOI:10.1246/bcsj.60.3817
日期:1987.10
Singlet-oxygen oxidation of 2-[hydroxy(4-nitrophenyl)methyl]tropone gave 6,7-dioxabicyclo[3.2.2]nona-3,8-dien-2-one derivatives in good yields. A change of regioselectivity of the oxygenation with a remarkable rate of enhancement (23 times) in deuteriomethanol vs. methanol could be best explained in terms of the quenching of singlet oxygen by the free hydroxyl group in the vicinity of the reaction