Stereoselectivity in the sigmatropic rearrangement of eight- and nine-membered cyclic allylsulfonium ylides. synthesis of vinyl- substituted butyro- and valerolactones
作者:Fusao Kido、Subhash C. Sinha、Toshiya Abiko、Masataka Watanabe、Akira Yoshikoshi
DOI:10.1016/s0040-4020(01)85601-5
日期:1990.1
The rhodium (II) acetate-catalyzed [2,3]sigma-tropic rearrangement of the diazo malonates of ()-4-phen-ylthio-2-buten-l-ol derivatives 6 afforded vinyl-substituted butyrolactones 10 in a highly stereoselective manner, while the rearrangement of the diazo malonates of homologues, ()-5-phenylthio-3-penten-1-ol derivatives 9, yielded vinyl-substituted valerolactones 13 and 14 in the predominance of the
()-4-苯甲硫基-2-丁烯-1-醇衍生物6的铑(II)乙酸铑催化的[2,3]σ-重排重氮丙二酸酯提供了高度立体选择性的乙烯基取代的丁内酯10以这种方式,虽然重排同系物的重氮丙二酸酯,但()-5-苯硫基-3-戊烯-1-醇衍生物9产生了乙烯基取代的戊内酯13和14,前者占优势。发现使用9中的立体化学固定的取代基R是导致后面的重排中的高立体选择性的重要因素,如通过使用重氮丙二酸酯20b作为底物所显示的。