Pt(IV)-catalyzed generation and [4+2]-cycloaddition reactions of o-quinone methides
作者:Suttipol Radomkit、Pakornwit Sarnpitak、Jumreang Tummatorn、Paratchata Batsomboon、Somsak Ruchirawat、Poonsakdi Ploypradith
DOI:10.1016/j.tet.2011.03.059
日期:2011.5
Novel intermolecular and intramolecular generations of ortho-quinone methides and their formal [4+2]-cycloaddition reactions with olefins catalyzed by PtCl4 and AuCl3 under mild conditions have been developed. Good to excellent yields (up to 99%) and diastereoselectivity (up to >99:1) of the chromans were obtained. PtCl4 was found to be effective and compatible with various functional groups present
已经开发了新的分子间和分子内生成的邻醌甲基化物及其在温和条件下与PtCl 4和AuCl 3催化的烯烃的正式[4 + 2]-环加成反应。获得了良好的品色(高达99%)和非对映体选择性(高达> 99:1)的苯并二氢吡喃。发现PtCl 4是有效的并且与存在于底物中的各种官能团相容。提出并讨论了其催化循环的机理。