7-Methyl-2,3,4,5-tetrahydro-1,4-oxazepin-5-one and the dioxepinone analogue: diastereofacial selectivity in catalytic hydrogenation and the explanation
A deMayo type cyclobutane ring opening of the photo[2 + 2]cycloadduct derived from 2,3-dihydro-4-pyrones and cyclopentene was effected by heating the adduct under an acid catalysis. The 1,2-disubstituted cyclopentanes thus formed spontaneously underwent intramolecular Michael addition to afford cis-hydroindan-5-ones in satisfactory yields.
衍生自 2,3-二氢-4-吡喃酮和环戊烯的光 [2 + 2] 环加合物的 de Mayo 型环丁烷开环是通过在酸催化下加热加合物来实现的。由此形成的 1,2-二取代环戊烷自发地进行分子内迈克尔加成,以令人满意的产率提供顺式-氢化茚满-5-酮。
A convenient route to 2,6-dialkyl-2,3-dihydro-4H-pyran-4-ones via oxidative cleavage of protected 1-(2-oxoalkyl)-cyclopropanols. Synthesis of (±)-hepialone and its natural congener
作者:Dmitry A. Astashko、Vladimir I. Tyvorskii
DOI:10.1016/j.tetlet.2011.07.042
日期:2011.9
An efficient strategy for the synthesis of 2,6-dialkyl-2,3-dihydro-4H-pyran-4-ones has been developed, the key steps of which are oxidative cleavage of the three-membered rings of 1-(2-oxoalkyl)-cyclopropanols and acid-promoted cyclization of the resulting beta-hydroxyketones. (C) 2011 Elsevier Ltd. All rights reserved.
Photodimeric cage compounds. V. Transformations of the dioximes of the photodimers of 2,6-dimethyl- and 2,6-diethyl-4-pyrone
作者:Peter Yates、Elli S. Hand
DOI:10.1021/ja01045a029
日期:1969.8
Gelin,S.; Gelin,R., Comptes Rendus des Seances de l'Academie des Sciences, Serie C: Sciences Chimiques, 1967, vol. 264, p. 1858 - 1861
作者:Gelin,S.、Gelin,R.
DOI:——
日期:——
Duperrier,A. et al., Bulletin de la Societe Chimique de France, 1974, p. 2207 - 2213