Transition-Metal-Free Formylation of Allylzinc Reagents Leading to α-Quaternary Aldehydes
作者:Ryosuke Haraguchi、Akinori Kusakabe、Nakaba Mizutani、Shin-ichi Fukuzawa
DOI:10.1021/acs.orglett.8b00360
日期:2018.3.16
The first example of formylation of allylzinc reagents using S-phenyl thioformate is presented. The reaction proceeded under mild conditions without any transition-metal catalyst, forming quaternary carbon centers with reactive functionalities, such as formyl and vinyl groups. Moreover, Barbier-type formylation of an allylic bromide with a sterically demanding thioformate was achieved. As a preliminary
给出了使用S-苯基硫代甲酸酯对烯丙基锌试剂进行甲酰化的第一个实例。反应在温和条件下进行,没有任何过渡金属催化剂,形成具有反应性官能团(如甲酰基和乙烯基)的季碳中心。此外,实现了烯丙基溴与空间上需要的硫代甲酸酯的Barbier型甲酰化。作为初步结果,使用薄荷醇衍生的手性硫代甲酸酯进行了不对称甲酰化。