A practical deca-gram scale ring expansion of (R)-(−)-carvone to (R)-(+)-3-methyl-6-isopropenyl-cyclohept-3-enone-1
作者:Leandro de C. Alves、André L. Desiderá、Kleber T. de Oliveira、Sean Newton、Steven V. Ley、Timothy J. Brocksom
DOI:10.1039/c5ob00525f
日期:——
A route to enantiopure (R)-(+)-3-methyl-6-isopropenyl-cyclohept-3-enone-1, an intermediate for terpenoids, has been developed and includes a highly chemo- and regioselective Tiffeneau–Demjanov reaction. Starting from readily available (R)-(−)-carvone, this robust sequence is available on a deca-gram scale and uses flow chemistry for the initial epoxidation reaction. The stereochemistry of the addition
对映纯(R)-(+)-3-甲基-6-异丙烯基-环庚-3-烯酮-1(一种萜类化合物的中间体)的途径已经开发出来,其中包括对Tiffeneau-Demjanov具有高度化学和区域选择性的反应。从容易获得的(R)-(-)-香芹酮开始,这种健壮的序列以十克规模可用,并将流化学用于初始环氧化反应。已通过X射线衍射研究和化学相关性确定了将两个亲核试剂加到(R)-(-)-香芹酮的羰基上的立体化学。