Generation of o-quinodimethanes via the electrocyclic reaction of (4Z)-1,2,4,6,7-octapentaenes derived from the organoborate complexes and their subsequent reactions
作者:Quan Zhang、Kung K Wang
DOI:10.1016/s0022-328x(99)00056-x
日期:1999.6
reaction then generated the o-quinodimethane 24, which underwent a [1,5]-sigmatropic hydrogen shift to afford 25. Oxidative work-up followed by protonation gave the phenol 26. The presence of a boron group and a tin group in 25 also provides handles to allow their transformations to an allyl substituent and an iodo substituent in 27. Attempts to capture the o-quinodimethane in 32 with the carbon–carbon
用1-硫代-3,4-戊二烯-1-炔21处理烯丙基二环己基硼烷(20)产生有机硼酸酯络合物22,其在用三甲基氯化锡进一步处理时原位提供烯二烯23。随后的随后的环化反应生成了邻喹啉甲烷24,其经历了[1,5]-σ氢转移,得到25。氧化后质子化后得到苯酚26。25中存在一个硼基团和一个锡基团也提供了使它们转变为27个中的烯丙基取代基和碘代取代基的方法。尝试用分子内碳-碳双键捕获32中的邻喹啉甲烷,得到的三环酚34收率很低(6%)。通过使用有机硼烷36和1-lithio-1,2-庚二烯(37)的组合形成有机硼酸酯络合物38,邻-喹二甲烷40也可以原位生成,从而生成苯酚42和苯乙烯43。