N-Heterocyclic Carbene-Catalyzed Monoacylation of 1,4-Naphthoquinones with Aldehydes
摘要:
The NHC-catalyzed conjugate hydroacylation of 1,4-naphthoquinones allows for the synthesis of monoacylated 1,4-dihydroxynaphthalene derivatives. These targets, difficult to prepare selectively by standard protocols, represent important intermediates in the elaboration of highly substituted 1,4-naphthoquinone derivatives, which constitute relevant pharmaceutical scaffolds. High regioselectivity has been observed in the hydroacylation reaction when starting from nonsymmetrical quinones.
作者:Isuru Dissanayake、Jacob D. Hart、Emma C. Becroft、Christopher J. Sumby、Christopher G. Newton
DOI:10.1021/jacs.0c06306
日期:2020.8.5
5-Bis(tert-butyldimethylsilyloxy)furans are established as vicinal bisketene equivalents for application as dienes in the Diels-Alderreaction. Cycloaddition with olefinic dienophiles, under exceptionally mild conditions, enables convergent access to highly substituted para-hydroquinones in unprotected form via a one-pot Diels-Alder/ring-opening/tautomerization sequence. The synthesis of para-benzoquinones from
Microwave-assisted solid-phase Dötz benzannulation reaction: a facile synthesis of 2,3-disubstituted-1,4-naphthoquinones
作者:Muthian Shanmugasundaram、Israel Garcia-Martinez、Qingyi Li、Abril Estrada、Nancy E. Martinez、Luis E. Martinez
DOI:10.1016/j.tetlet.2005.08.158
日期:2005.10
A microwave-assisted solid-supported Dötzbenzannulation of chromium carbene complexes with various alkynes has been developed. The oxidative cleavage of the resulting resin-bound 1,4-naphthols affords 2,3-disubstituted-1,4-naphthoquinone derivatives in good to moderate yields with high purities.
A transition-metal mediated regioselective synthesis of phenyl quinones via sequential benzannulation and cross coupling reactions
作者:Kin Shing Chan、Chi Ching Mak
DOI:10.1016/s0040-4020(01)85064-x
日期:1994.2
regioselective synthesis of polysubstituted quinones by the benzannulation and subsequent cross couplingreactions has been developed. Alkenyl chromium carbene complexes undergo regioselective benzannulation with 2-(trimethylsilyl)-1-phenylethyne with oxidative workup to yield silyl quinones which upon iodination with ICI produce iodoquinones. Subsequent Stille's and Suzuki's cross couplingreactions of these
Arylation of Benzo-Fused 1,4-Quinones by the Addition of Boronic Acids under Dicationic Pd(II)-Catalysis
作者:María Teresa Molina、Cristina Navarro、Ana Moreno、Aurelio G. Csákÿ
DOI:10.1021/ol902084g
日期:2009.11.5
The first examples of the direct arylation of benzo-fused 1,4-quinones by the dicationic Pd(II)-catalyzed addition of arylboronic acids are reported. The addition reaction is carried out under very mild conditions (dioxane-H2O, rt, open air atmosphere) and is tolerant of free OH groups. In addition, the reaction shows high regioselectivity, when using nonsymmetrical quinones as starting materials.
WATANABE MITSUAKI; HISAMATSU SADAYOSHI; HOTOKEZAKA HIROSHI; FURUKAWA SUNA+, CHEM. AND PHARM. BULL., 34,(1986) N 7, 2810-2820