Photochemistry of 5-methylpyrimidin-4-ones in acetic acid solution: thermal rearrangements of Dewar pyrimidinones and 4-acetoxyazetidin-2-ones
作者:Tamiko Takahashi、Shun-ichi Hirokami、Masanori Nagata、Takao Yamazaki
DOI:10.1039/p19880002653
日期:——
(3a) and (3b) and the 4-acetoxyazetidin-2-ones (4c–e) in the presence of acetic acid at 21–40 °C and without solvent at 100–110 °C were carried out to elucidate the rearrangements. The major products from (3a) and (3b) in acidic solutions at 40 °C were N-acetyl-3-acetamido-2,4,4,N-tetramethylpent-2-enamide (6a), N-methylacetamide (9a), 2,5-dimethyl-4-t-butyl-1,3-oxazin-6-one (10a), 2-piperidone (9b)
在0°C下于乙酸-乙腈(1:2,v / v)溶液中辐照3,6-二烷基-5-甲基嘧啶-4-酮(1a – f),得到4-乙酰氧基-3-(1-亚氨基) -2,2-二甲基丙基)-1,3,4-三甲基氮杂环丁烷-2-酮(3a),6-乙酰氧基-7-(1-亚氨基-2,2-二甲基丙基)-7-甲基-1-氮杂双环[4.2 .0] octan-8-one(3b),4-乙酰氧基-3-乙酰基-1,3,4-三烷基氮杂环丁烷-2-ones(4c – e),4-乙酰氧基-3-乙酰基-1,3-二甲基氮杂环丁烷主要产物为-2-一(4f),3-乙酰基-4-亚烷基-1,3-二甲基氮杂环丁烷-2-一(5d)和(5e)。1,4,6-三甲基-3-叔丁基-2,6-二氮杂双环[2.2.0] hex-2-en-5-one(2a)(杜瓦嘧啶酮)在0°C的乙酸-乙腈溶液(1:14,v / v)中,在无溶剂的条件下于80°C进行(2a)的热解,得到