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四氫異喹啉之構形異物的合成及變溫核磁共振光譜研究

Synthesis and Variable-temperature NMR Studies of the Conformers of Tetrahydroisoquinoline

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摘要


6,7-二甲氧基-3,4-二氫異喹啉(6,7-dimethoxy-3,4-dihydroisoquinoline)以氫硼化鈉還原得6,7-二甲氧基-1,2,3,4-四氫異喹啉的兩構形物。此兩構形物己經由各光譜資料研究確定。經由變溫核磁共振光譜(VT NMR)研究提出,在不同溫度下,N-H鍵可能進行電荷移轉(charge transfer CT),低溫下或反應時間較長,未共用電子對在赤道向(equatorial)是相對安定的構形。

關鍵字

異喹啉 構形物 電荷移轉

並列摘要


Reduction of 6,7-dimethoxy-3,4-dihydroisoquinoline with sodium boron hydride in methanol yielded two conformers of 6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline. These compounds have been characterized by spectroscopic studies. VT NMR studies suggest that the N-H bond may undergo charge transfer (CT) in variable temperature. It is concluded that the lone pair electron in the equatorial position is predominate under longer reaction time or lower temperature condition.

並列關鍵字

Isoquinoline Conformers Charge Transfer

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