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0004220870
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VCH, Weinheim, and references therein
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Nicolaou, K.C.1
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16
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33845283207
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While there are examples of highly activated dienophiles reacting under strictly thermal conditions; a) P. A. Wender, R. M. Keenan, H. Y. Lee, J. Am. Chem. Soc. 1987, 109, 4390;
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17
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0009642235
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H. simple aliphatic-aldehydes typically require high pressure for noncatalyzed reactions
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b) A. Hosomi, Y. Sakata, H. Sakurai, H. Tetrahedron Lett. 1985, 26, 5175, simple aliphatic-aldehydes typically require high pressure for noncatalyzed reactions:
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Hosomi, A.1
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20
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0000740896
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27
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0342507094
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note
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In a competition experiment between compounds 4 and 14, 2-cyclohexen-1-one reacted preferentially with 14.
-
-
-
-
28
-
-
0020464967
-
-
For information regarding the regiochemistry of 13, see reference [3]
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The Diels-Alder reaction of 14 with methyl vinyl ketone gave a 4:1 ratio of regioisomers 26:27, while that between 2-eyclohexen-1-one and 14 gave a 2:1 ratio of 28:29. Poor regioselectivity of 4-methoxy-substituted o-quinone dimethides in Diels - Alder cycloadditions is preeedented in reactions with methyl acrylate: Y. Ito, M. Nakatsuka, T. Saegusa, J. Am. Chem. Soc. 1982, 104, 7609. For information regarding the regiochemistry of 13, see reference [3].
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Ito, Y.1
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32
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34
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0033583282
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