Sequential Peripheral Cyclopropanation as a Synthetic Approach to Cyclosubstituted Triangulanes
摘要:
A general scheme for the synthesis of cyclosubstituted triangulanes has been developed, based on sequential bromocyclopropanation of the C=C bond and elimination, giving repeatedly the endomethylenecyclopropane framework with termination of the sequence of the cyclopropanation.
SILVER-CATALYZED REDUCTIVE DEHALOGENATION OF 1,1-DIBROMOCYCLOPROPANES
作者:Nobujiro Shimizu、Kenji Watanabe、Yuho Tsuno
DOI:10.1246/cl.1983.1877
日期:1983.12.5
1,1-Dibromocyclopropanes underwent rapid reduction to the corresponding monobromides in high yields on treating with LiAlH4-1 mol% silver perchlorate in THF, presumably via a silver-catalyzed radical chain mechanism.
Photo-irradiation of nine gem-dibromocyclopropanes in ether solution leads to the corresponding monobromocyclopropanes in moderate to good yields. The stereochemical observation indicates that the partial reduction proceeds via an α-bromocyclopropyl radical.
Reductive Carbonylation of<i>gem</i>-Dihalogenocyclopropanes by Pentacarbonyliron(0) in the Presence of Sodium Methoxide
作者:Françoise Reyne、Bernard Waegell、Pierre Brun
DOI:10.1246/bcsj.68.1162
日期:1995.4
The reaction of gem-dihalogenocyclopropanes derivatives with (tetracarbonyl)(methoxycarbonylato)ferrate(I−) has been investigated; gem-dibromocyclopropanes and gem-chlorobromocyclopropane derivatives are reduced and carbonylated. It could be shown that a bromo ester such as methyl 1-bromo-2-phenylcyclopropanecarboxylate is an intermediate in the transformation of 1,1-dibromo-2-phenylcyclopropane into methyl cis- and trans-2-phenylcyclopropanecarboxylates and dimethyl 2-phenyl-1,1-cyclopropanedicarboxylate.