Synthesis and Herbicidal Activity of 2α,4α-Dimethyl-8-oxabicyclo[3.2.1]oct-6-en-3-one Derivatives
作者:Adilson V. Costa、Luiz Cláudio de A. Barbosa、Antonio J. Demuner、Antonio A. Silva
DOI:10.1021/jf990257k
日期:1999.11.1
The catalytic oxidation of 2alpha,4alpha-dimethyl-8-oxabicyclo[3.2. 1]oct-6-en-3-one with osmium tetraoxide and excess hydrogen peroxide resulted in the formation of 2alpha,4alpha-dimethyl-6, 7-exo-isopropylidenedioxy-8-oxabicyclo[3.2.1]octan-3-one (2), with 91% yield. Addition of aryllithium reagents to this compound resulted in the formation of the aromatic alcohols (6a-h) with 48-76% yield. These
2α,4α-二甲基-8-氧杂双环的催化氧化[3.2。1] oct-6-en-3-one与四氧化os和过量的过氧化氢导致形成2alpha,4alpha-dimethyl-6,7-exo-isopropylidenedioxy-8-oxabicyclo [3.2.1] octan-3-one (2),产率为91%。向该化合物中添加芳基锂试剂导致形成芳族醇(6a-h),产率为48-76%。将这些醇用亚硫酰氯的吡啶处理,得到相应的烯烃(7a-h),产率为46-80%。在6.6微克g(-)(1)的浓度下评估了化合物6a-h和7a-h对双色高粱根系生长的影响。醇6a-h对双色链球菌的胚根生长产生抑制作用(8-100%)。三种活性最高的化合物是6e(芳基=对甲基苯基),6g(芳基=对氯苯基),6h(芳基=对氟苯基)并引起100%抑制。烯烃7a-h的作用较不明显,抑制作用从15%到46%不等。在温室中进行了另一项实验,以评估6