Face selectivity of theDiels-Alder additions and cheletropic additions of sulfur dioxide to 2- vinyl-7-oxabicyclo[2.2.1]hept-2-ene derivatives
作者:Lieven Meerpoel、Maria-Miranda Vrahami、Brigitte Deguin、Pierre Vogel
DOI:10.1002/hlca.19940770326
日期:1994.5.11
Racemic 6-ethenyl-7-oxabicyclo[2.2.1]hept-5-en-2-one (23), 5-ethenyl-7-oxabicyclo[2.2.1]hept-5-en-2-one (25) and their ethylene acetals 24 and 26, respectively, were derived from the Diels-Alder adduct of furan to 1-cyanovinyl acetate (27). The Diels-Alder additions of 26 to dimethyl acetylenedicarboxylate, to methyl propynoate, to N-phenylmaleimide, and to methyl acrylate were highly exo-face selective
外消旋6-乙烯基-7-氧杂双环[2.2.1]庚-5-烯-2-酮(23),5-乙烯基-7-氧杂双环[2.2.1]庚-5-烯-2-酮(25)它们的乙缩醛24和26分别来自呋喃与乙酸1-氰基乙烯基酯的Diels-Alder加合物(27)。的狄尔斯-阿德耳的增加26到乙炔二,以甲基丙炔,以Ñ苯基马来,以及丙烯酸甲酯是高度外型-面选择性,因为是甲基丙炔的环加成至烯酮23和25和乙炔二羧酸二甲酯制得乙二氧基二烯24。SO的cheletropic添加2到23 - 26只得到相应sulfolenes 57 - 60从所得的外型的semicyclic二烯的动力学和热力学控制的条件下,面取向攻击。