Heterocyclic cycloproparenes: 5H-cycloprop[f]isobenzofuran and 5H-cyclopropa[f][2]benzothiophene
作者:Ian J Anthony、Dieter Wege
DOI:10.1016/s0040-4039(00)95584-9
日期:——
The title compounds have been prepared from the Diels - Alder adducts of 1,2-dibromocyclopropene with 3,4-bis(methylene)-tetrahydrofuran and 3,4-bis(methylene)-tetrahydrothiophene by a sequence involving dehydrogenation and dehydrobromination.
Synthesis of Carbo- and Heterocyclic Cycloprop[<i>f</i>]indenes<i>via</i>cycloaddition of dienes to cyclopropenes
作者:Paul Müller、Zhongshan Miao
DOI:10.1002/hlca.19940770714
日期:1994.11.2
substituents at C(4) have been obtained via cycloaddition of 22b to 1-bromo-2-chlorocyclopropene. The key step of the sequence is a double Curtius degradation of the cycloadduct 23b to the ketone 27a. While aromatization of the alcohol 27b provided the cycloprop[f]indenol 28b, the reaction failed with 27a. Attempts to convert 28b to 1,3-dihydrocycloprop[f]indene (25) via the methanesulfonate 28d failed.
杂环环丙并[ ˚F ]茚19合成通过二烯环加成10到环丙烯11A和随后的碱诱导的芳构化。虽然19是可分离的,但寿命很短,但oxa类似物18在其制备所需的条件下会分解。杂环部分饱和的二氟衍生物14和15可通过环加成法获得,但是相应的二氯化物也不可分离。通过环加成获得C(4)上带有取代基的环丙[ f ]茚。22b为1-溴-2-氯环丙烯。该序列的关键步骤是环加合物23b到酮27a的两次Curtius降解。虽然醇27b的芳构化提供了环丙[ f ]茚满醇28b,但反应失败并变为27a。试图通过甲磺酸盐28d将28b转化为1,3-二氢环丙[ f ]茚(25)的尝试失败了。
Synthesis and reactivity of 3-thia-7,7-dimethyl-7-germabicyclo[3.3.0]oct-1(5)-ene and its selenium analog
作者:Pierre Mazerolles、Christian Laurent
DOI:10.1016/0022-328x(91)80079-y
日期:1991.1
3-Thia-7,7-dimethyl-7-germabicyclo[3.3.0]oct-1(5)-ene and its selenium analog, prepared by cycloaddition of a germylene to 3,4-bis(methylene)thiolane and selenolane, respectively, react with 2,3-dichloro-5,6-dicyanoquinone to give the corresponding substituted thiophene and selenophene Oxidation of the sulfur compound with metachloroperbenzoic acid leads to the germabicyclic sulfone, a precursor of 3,4-bis(methylene)germacyclopentane.
Preparation and selected reactions of 2,3-bis(bromomethyl)-1,3-butadiene
作者:Yehiel Gaoni、Shoshana Sadeh
DOI:10.1021/jo01293a021
日期:1980.2
Pettett, Michael G.; Holmes, Andrew B., Journal of the Chemical Society. Perkin transactions I, 1985, p. 1161 - 1166