Tandem Fragmentation of Cyclopropylcarbinyl/Oxiranylcarbinyl Radicals. On the Reversibility of Oxiranylcarbinyl/Allyloxyl Radical Formation
作者:Frederick E. Ziegler、Anders K. Petersen
DOI:10.1021/jo00089a012
日期:1994.5
The tandem radical fragmentation of four stereoisomeric epoxy thiocarbonates 7c-10c has been investigated. In each instance a cyclopropylcarbinyl radical fragments to generate an oxiranylcarbinyl radical, which, in turn, undergoes fragmentation. The Initially detected product is (Z)-allylic alcohol 23, which isomerizes to (E)-allylic alcohol 24 under acid catalysis. The reversibility of allyloxyl radical formation is considered.
The Development of a Facile Tandem Wolff/Cope Rearrangement for the Synthesis of Fused Carbocyclic Skeletons
作者:Richmond Sarpong、Julius T. Su、Brian M. Stoltz
DOI:10.1021/ja037587c
日期:2003.11.1
set of mild processes for the conversion of vinyl cyclopropyl diazo ketones to highly functionalized cycloheptadienones and vinyl cyclopentenones by use of a target-inspired tandem Wolff/Cope rearrangement sequence is described. A divergent reaction course of the vinyl cyclopropyl diazo ketone substrates under sono- or photochemical activation provides good to excellent yields (55-98%) of the product