Unusual endoperoxide isomerizations: a convenient entry into 2-vinyl-2-cyclopentenones from saturated fulvene endoperoxides
摘要:
An unusual peroxide base-promoted isomerization is uncovered. Saturated endoperoxides derived from fulvenes give rise to 2-vinyl-2-cyclopentenones upon treatment with DBU in CH2CL2 in a one-pot reaction. This methodology is applied to a convenient synthesis of dihydrojasmone. Moreover, functional groups placed on the side chain at C-6 participate in the base-catalyzed isomerizations via conjugate attack at the enone moiety to give 2-cyclopentenones carrying oxygen heterocycles at C-2. (c) 2006 Elsevier Ltd. All rights reserved.
Unusual rearrangement in the reaction of cyclopropanated cyclopentadienes with Et<sub>3</sub>Al/CH<sub>2</sub>I<sub>2</sub> in CH<sub>2</sub>Cl<sub>2</sub>
作者:I. R. Ramazanov、A. V. Yaroslavova、N. R. Yaubasarov、U. M. Dzhemilev
DOI:10.1080/00397911.2018.1511999
日期:2018.10.2
Abstract The reaction of Et3Al/CH2I2 reagent with cyclopropanated spiro[2.4]hepta-4,6-diene and 6-substituted fulvenes in CH2Cl2 was found to lead to the selective formation of rearrangement products through sequential cyclopropyl-allyl rearrangement and cyclopropanation. Graphical Abstrat
Accessing Monosubstituted Cyclopentadienyl Rhodium(I) and Iridium(I) Complexes by a Simultaneous Nucleophilic Addition-Metalation Approach to Fulvenes
作者:Aragorn Laverny、Nicolai Cramer
DOI:10.1021/acs.organomet.0c00550
日期:2020.12.28
Despite advances in the synthesis of polysubstituted cyclopentadienyl metal complexes, the rapid access to a library of monosubstituted Cp bearing metal complexes remains challenging. A convenient and general method to access a broad range of monosubstituted cyclopentadienyl rhodium(I) and iridium(I) complexes is reported. The process involves a direct nucleo-metalation of fulvenes with widely available