Generation and intramolecular cyclization of (2-ethenylphenyl)bisketenes. Synthesis of benzofuranones
摘要:
Several new differentially substituted cyclobutenediones 4a-e have been prepared. Their thermal rearrangement to substituted naphthofuranones 5a-d is reported. This rearrangement involves an unprecedented intramolecular cyclization of a reactive bisketene 6, and forms the naphthofuranone system in good yield. (C) 1998 Elsevier Science Ltd. All rights reserved.
enantioselective C-acylation of 3-substituted benzofuran-2(3H)-ones (with up to 97% ee) was developed using a chiral bicyclic imidazole catalyst OAc-DPI and an achiral tertiary amine additive DIPEA. The reaction...
An enantioselective Mannich reaction of N-Boc aminosulfones with 3-methylbenzofuran-2 (3H)-ones catalyzed by a quinine-derived bifunctional phase transfer catalyst was developed, by which a series of chiral benzofuranones bearing adjacent quaternary and tertiary carbon centers were obtained in high yields (up to 96%) with good diastereoselectivities (up to >99:1) and enantioselectivities (up to 98%)
开发了由奎宁衍生的双功能相转移催化剂催化的 N -Boc 氨基砜与 3-甲基苯并呋喃-2 (3H)-酮的对映选择性曼尼希反应,通过该反应获得了一系列带有相邻季碳和叔碳中心的手性苯并呋喃酮高产率(高达 96%),具有良好的非对映选择性(高达 >99:1)和对映选择性(高达 98%)。
Kennedy, Michael; McKervey, M. Anthony; Maguire, Anita R., Journal of the Chemical Society. Perkin transactions I, 1990, # 4, p. 1041 - 1045
作者:Kennedy, Michael、McKervey, M. Anthony、Maguire, Anita R.、Naughton, Sean
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Synthesis of Naphthofuran-2(3<i>H</i>)-one Derivatives by Palladium-Catalyzed Three-Component Coupling Using Naphthols, Aldehydes, and Carbon Monoxide