Novel Domino Oxidative Coupling: C−C Bond Formation Sequence to Highly Functionalized Dibenzo[<i>a</i>,<i>c</i>]cycloheptenes
作者:Kristina Hackeloer、Gregor Schnakenburg、Siegfried R. Waldvogel
DOI:10.1021/ol102969k
日期:2011.3.4
A domino sequence involving various MoCl5-mediated oxidations followed by trapping and supposed [3,3]-sigmatropic rearrangement provides a fast access to the full carbon skeleton of metasequirin-B. A variety of different moieties R1 and R2 are tolerated.
Oxidative Coupling Reactions of 1,3-Diarylpropene Derivatives to Dibenzo[a,c]cycloheptenes by PIFA
作者:Kristina Hackelöer、Gregor Schnakenburg、Siegfried R. Waldvogel
DOI:10.1002/ejoc.201100918
日期:2011.11
The oxidative cyclization reactions of a variety of α-benzyl-cinnamates can be selectively performed with hypervalent iodine as an oxidant. The dibenzo[a,c]cycloheptenes were isolated in up to 55 % yield. When an oxo substrate is applied, the yield was significantly increased. With this synthetic approach, a central intermediate for the synthesis of metasequirin-B was obtained in three steps from very