Hydroxy-group effect on the regioselectivity in a photochemical oxetane formation reaction (the Paternò-Büchi Reaction) of geraniol derivatives
作者:Ken Hisamoto、Yoshikazu Hiraga、Manabu Abe
DOI:10.1039/c1pp05056g
日期:2011.9
the PB reaction at the allylic alcohol moiety, whereas the PB reaction at the unfunctionalized double bond produces the oxetane 3a. The PB reaction of the hydroxy-protected methyl ether 1b and acetate 1c gave selectively oxetanes 3b,c derived from the reaction at the more nucleophilic double bond, 2/3 ∼ 15/85. The hydroxyl-group effect was found to be small, but apparently increased the formation of 2a
香叶醇衍生物1的Paternò–Büchi(PB)反应,其中含有烯丙醇官能团和未官能化的双键,二苯甲酮进行了研究,以看到在氧杂环丁烷的形成区域选择性,羟基的效果,即,2 / 3。低浓度香叶醇(1a)以2a / 3a=ca的比例形成氧杂环丁烷2a和3a 。50/50。氧杂环丁烷2a衍生自烯丙基醇部分的PB反应,而未官能化双键的PB反应产生了氧杂环丁烷3a。的PB反应的羟基保护的甲基醚1b中和乙酸1c中得到选择性的氧杂环丁烷图3b,C从在多个亲核的双键的反应中,得到的2 / 3〜15/85。发现羟基效应很小,但是显然增加了羟基的形成。2a在PB反应中香叶醇(1a)。