A stereoselectivity in an intramolecular cycloaddition of the olefinic -quinodimethanes 13 and 23 generated from the thermolysis of optically active 4β-[2-(4-methoxybenzocyclobutenyl)ethyl] -5α-methoxymethyl-3-phenyl-thio-methylenefuran-2-ones 12 and 22, respectively, is studied and a stereoselective synthesis of (+)--4,5-( 4-methoxybenzo) -1β,7aβ-(2α-methoxymethyl-5-oxofuro)hydrindane 1 is also described
由光学活性4β-[2-(2-(4-甲氧基
苯并环丁烯基)乙基]-5α-甲氧基甲基-3-苯基-
硫代-亚甲基
呋喃-2-酮12的热分解生成的烯烃-喹二
甲烷13和23的分子内环加成中的立体选择性分别研究了图22和图22,并且还描述了(+)-- 4,5-(4-
甲氧基苯并)-1β,7aβ-(2α-甲氧基甲基-5-氧代
呋喃)氢化
茚1的立体选择性合成。