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.
A photochemical source of dibromo- and dichlorocarbene
作者:John F Hartwig、Maitland Jones、Robert A Moss、Witold Ławrynowicz
DOI:10.1016/s0040-4039(00)85359-9
日期:1986.1
Photolysis of triene 3a or 3b yields dibromo- and dichlorocarbene which can be transferred to olefins in good yield. A warning is offered regarding the data recently interpreted as being “only consistent” with the formation of an intermediate in the addition of dibromocarbene to trans-cyclooctene.
Zinc/Iron-Mediated Ring Opening of Dibromocyclopropanes for In Situ Diels-Alder Reactions with Electron-Deficient Aldehydes and Imines
作者:Florian Pünner、Gerhard Hilt
DOI:10.1002/ejoc.201300726
日期:2013.9
the carbonyl group of aldehydes, ketones, glyoxylic esters, or imines is necessary for the ring-opening reaction. The ring opening leads to a bromo-functionalized 1,3-diene, which then reacts in situ with the carbonyl group in a hetero-Diels–Alder reaction. The products are formed with high control of the regiochemistry and in good yields for electron-deficient aldehydes and imines, such as carbamates
Silver Ion-induced Allylation of Furan with Cyclopropyl Halides
作者:Nobujiro Shimizu、Kenji Watanabe、Yuho Tsuno
DOI:10.1246/bcsj.57.1165
日期:1984.4
Allyl species generated from 1-bromo-2-phenylcyclopropane and seven different 1,1-dihalocyclopropanes with the aid of silver perchlorate reacted with furan in a regio- and stereoselective manner to give a series of 2-allylfuran derivatives in fair to good yields.
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.