Kinetic versus Thermodynamic Stereoselectivity in the Hydrostannylation of Propargylic Alcohol Derivatives Using AIBN and Et<sub>3</sub>B as Promotors
作者:Martins S. Oderinde、Howard N. Hunter、Michael G. Organ
DOI:10.1002/chem.201202099
日期:2012.8.27
Et3BversusAIBN: Equally radical? The stereoselectivity of hydrostannylation of internal propargyl alcoholderivatives has been studied by using both 2‐2′‐azobisisobutyronitrile (AIBN) and Et3B as promoters. With silyl‐protected alcohols, complete Z selectivity of the resultant vinylstannane has been achieved with Et3B, whereas AIBN shows zero stereoselectivity. Evidence suggests that, despite decades
Et 3 B与AIBN:同样是激进的?通过使用2-2'-偶氮二异丁腈(AIBN)和Et 3 B作为促进剂,研究了内部炔丙醇衍生物的加氢苯乙烯基化的立体选择性。使用甲硅烷基保护的醇,用Et 3 B可以实现所得到的乙烯基锡烷的完全Z选择性,而AIBN的立体选择性为零。有证据表明,尽管经过了数十年的接受,采用Et 3 B和AIBN的加氢苯乙烯基化机理在机理上似乎是截然不同的。