The Preparation and Photoreation of Spiro[oxirane-2,6′-tricyclo[3.2.1.0<sup>2,7</sup>]oct[3]en]-8′-ones. An Intramolecular Cycloaddition of Photochemically Generated Ketene with the Epoxide Ring
作者:Makoto Nitta、Akihiko Omata、Hazime Nakatani
DOI:10.1246/bcsj.56.2009
日期:1983.7
7]oct-3-en-8-ones with 3-chloroperbenzoic acid or thallium(III) acetate resulted in the formation of 1′,5′-dimethyl and 1′,3′,5′-trimethylspiro[oxirane-2,6′-tricyclo[3.2.1.02,7]oct[3]en]-8′-ones (2a and 2b). The oxidation occured stereoselectively on the exocyclic double bond from the exo-side. The photochemical reactions of 2a and 2b resulted in the formation of 4,8-dimethyl- and 4,6,8-trimethyl-3,
1,5-二甲基-和 1,3,5-三甲基-6-亚甲基三环 [3.2.1.02,7]oct-3-en-8-ones 与 3-氯过苯甲酸或铊 (III) 乙酸酯的氧化导致1',5'-二甲基和 1',3',5'-trimethylspiro[oxirane-2,6'-tricyclo[3.2.1.02,7]oct[3]en]-8'-ones (2a和 2b)。氧化立体选择性地发生在外环双键上。2a 和 2b 的光化学反应导致 4,8-二甲基-和 4,6,8-三甲基-3,4-二氢-1H-2-苯并吡喃-3-酮的形成,这两种化合物均来自烯酮中间体与 [4π+2σ] 电子系统中涉及的外氧化物环的烯型反应。乙烯酮的中间体通过低温红外光谱以及捕获实验进行评估,