Photochemical ring opening of cyclopropyl ketones induced by electron transfer
作者:Janine Cossy、Nathalie Furet
DOI:10.1016/s0040-4039(00)61464-8
日期:1993.12
Irradiation of substituted bicyclo[n.1.0]alkan-2-ones at 254 nm in the presence of triethylamine and lithium perchlorate (LiClO4) can lead to cyclopropane ring opening with cleavage of the C(1)-C(n+2) (ring enlargement) or C(1)-C(n+3) bonds.
Ring opening of cyclopropylketones induced by photochemical electron transfer
作者:Janine Cossy、Nathalie Furet、Samir BouzBouz
DOI:10.1016/0040-4020(95)00727-p
日期:1995.10
Depending on the substitution pattern of cyclopropylketones, the photochemically induced electron transfer of tertiary amines to cyclopropylketones leads either to the formation of 3-substituted cycloalkanones or to ring expanded products.
根据环丙基酮的取代方式,光化学诱导的叔胺电子转移至环丙基酮会导致3-取代的环烷酮的形成或环扩产物。
Novel Intramolecular Cyclopropanation Reaction of Unsaturated β-Keto Esters
esters are versatile intermediates for the synthesis of many biologically active natural products. Here we report a new intramolecular cyclopropanation reaction of unsaturated beta-keto esters. In the presence of I(2), Et(3)N, and Lewis acids such as Mg(ClO(4))(2) and Yb(OTf)(3), beta-keto esters 1 bearing various olefin substituents were transformed to fused cyclopropanes 2 in a highly stereospecific manner