Radical cyclization–fragmentation of ω-haloalkyl cyclobutanones: a modular approach to medium-sized carbocycles
作者:Heong-Sub Oh、Jin Kun Cha
DOI:10.1016/j.tetasy.2003.07.011
日期:2003.10
Kulinkovich cyclopropanation of cycloalkene carboxylates and subsequent electrophilic addition to haloalkyl acetals, provides a convenient method for appending seven- and eight-membered rings onto cycloalkene carboxylates. An enantioselective preparation of a medium-sizedcarbocycle is possible by the use of a non-racemic, C2-symmetric acetal.
Radical Fragmentation of ω-Bromoalkyl Cyclobutanones. A Modular Approach to Eight-Membered Carbocycles
作者:Heong-Sub Oh、Hyoung Ik Lee、Jin Kun Cha
DOI:10.1021/ol026666a
日期:2002.10.1
[reaction: see text] An eight-membered ring was conveniently appended onto a cycloalkene carboxylate by employing a facile radical cyclization-fragmentation reaction of an omega-bromoalkyl spirocyclobutanone, which was readily accessible by the Kulinkovich cyclopropanation and subsequent electrophilic addition to a 3-bromoalkyl acetal.