Oxidative rearrangement of 2-furylcarbamates with dimethyldioxirane: a high-yielding preparation of 5-hydroxypyrrol-2(5H)-ones
摘要:
A mild, general and efficient method for the oxidative rearrangement of 2-furylcarbamates to N-Boc-5-hydroxypyrrol-2(5H)-ones is reported. The feasibility of removing the Boc group from the products was demonstrated by the synthesis of two hitherto unknown 5-aryl-5-hydroxypyrrol-2(5H)-ones. (C) 2011 Elsevier Ltd. All rights reserved.
Indole synthesis by palladium-catalyzed tandem allylic isomerization – furan Diels–Alder reaction
作者:Jie Xu、Peter Wipf
DOI:10.1039/c7ob01654a
日期:——
A Pd(0)-catalyzed elimination of an allylic acetate generates a π-allyl complex that is postulated to initiate a novel intramolecular Diels–Alder cycloaddition to a tethered furan (IMDAF). Under the reaction conditions, this convergent, microwave-accelerated cascade process provides substituted indoles in moderate to good yields after Pd-hydride elimination, aromatization by dehydration, and in situ
Sequential Aminodiene Diels−Alder Approach to the Ergoline Skeleton
作者:Albert Padwa、Scott K. Bur、Hongjun Zhang
DOI:10.1021/jo0508797
日期:2005.8.1
diene. The presence of this activating group not only prevents the isomerization of the advanced ergoline intermediate to a naphthalene but can also be leveraged for an oxidation to provide Uhle's ketone (13). The easily formed Kornfeld ketone analogue 25 was readily transformed into the corresponding triflate 41 by the action of triflic anhydride and a base. Oxidative addition of vinyl triflate 41 to Pd(0)
A Novel Sequential Aminodiene Diels−Alder Strategy for the Rapid Construction of Substituted Analogues of Kornfeld's Ketone
作者:Scott K. Bur、Albert Padwa
DOI:10.1021/ol0268992
日期:2002.11.1
[GRAPHICS]Through a novel sequence of aminodiene Diels-Alder reactions, amidofurans 18a-c were converted to tricyclic ketones 21a-c in moderate to good yields. Ketone 21a could be converted to Uhle's ketone (6) by cleaving the tert-butyl carbamate and oxidatively removing the methyl ester. Tricycle 21a readily underwent bromination to give 22. Formation of the corresponding enol triflate 25 followed by carbonylation gave ester 27, which was then coupled with N-methyl propriolamide to furnish 26.
Formation of 6-Azaindoles by Intramolecular Diels–Alder Reaction of Oxazoles and Total Synthesis of Marinoquinoline A
作者:Mana Osano、Dishit P. Jhaveri、Peter Wipf
DOI:10.1021/acs.orglett.0c00417
日期:2020.3.20
6-azaindoles was developed. The IMDAO reaction was applied in a total synthesis of the aminophenylpyrrole-derived alkaloid marinoquinoline A, also featuring the use of a Curtius reaction for preparation of a 5-aminooxazole, a propargylic C,H-bond insertion, an in situ alkyne-allene isomerization, and a ruthenium-catalyzedcycloisomerization for benzene ring annulation to the 6-azaindole.