Diazoacetoacetate Enones for the Synthesis of Diverse Natural Product-like Scaffolds
摘要:
Diazoacetoacetate enones are a new class of Michael acceptors that enable the efficient construction of natural product-like scaffolds. Through their Michael addition reactions, including those with silyl enol ethers, indoles, pyrroles, and amines, delta-functionalized diazoacetoacetates are formed in high yield and with overall operational efficiency. Subsequent catalytic dinitrogen extrusion reactions provide access to a diverse series of natural product-like carbo- and heterocyclic ring systems in only three steps from commercial materials.
Domino Primary Alcohol Oxidation-Wittig Reaction: Total Synthesis of ABT-418 and (<i>E</i>)-4-Oxonon-2-enoic Acid
作者:Santosh Tilve、Jyoti Shet、Vidya Desai
DOI:10.1055/s-2004-829123
日期:——
Domino oxidation of primary alcohols to α,β-unsaturatedcompounds using the combination of PCC-NaOAc and stabilized Wittig reagent and its application towards total synthesis of ABT-418 and 4-oxonon-2-enoic acid is described.
Regio- and Diastereoselective Synthesis of Functionalized Cyclopentenones by Domino Michael-Ester-Wittig Reactions of (3-Alkoxycarbonyl-2-oxopropylidene)triphenylphosphoranes with Maleic Diesters
作者:Peter Langer、Bettina Kracke
DOI:10.1055/s-2001-18085
日期:——
The domino Michael-Ester-Wittig reaction of maleic diesters with (3-alkoxycarbonyl-2-oxopropylidene)triphenylphosphoranes resulted in regio- and diastereoselective formation of functionalized cyclopentenones.
‘Michael-Michael-Wittig’ Reactions of (2,4-Dioxobutylidene)phosphoranes with 3-Formylchromones
作者:Peter Langer、Edith Holtz
DOI:10.1055/s-2003-37104
日期:——
4-(2′-Hydroxybenzoyl)salicylic esters and amides were prepared by domino ‘Michael-retro-Michael-Wittig’ reactions of (2,4-dioxobutylidene)triphenylphosphoranes with 3-formylchromones.
Synthesis of 4,5-Benzotropones by Cyclization of 1,3-Bis-Silyl Enol Ethers with 1,2-Dialdehydes
作者:Uwe Albrecht、Thi Hong Van Nguyen、Peter Langer
DOI:10.1021/jo049736v
日期:2004.5.1
The cyclization of 1,3-bis-silylenolethers or (2,4-dioxobutylidene)triphenylphosphoranes with phthalic dialdehyde allowed a convenient synthesis of a variety of 4,5-benzotropones. The hydrogenation of benzotropones afforded functionalized benzocycloheptanones which were transformed into tricyclic butenolides.
Synthesis of γ-(2,4-Dioxobut-1-ylidene)butenolides by Reaction of Masked 1,3-Dicarbonyl Dianions with Maleic Anhydrides and Phthaloyl Dichloride
作者:Peter Langer、Uwe Albrecht、Van Thi Nguyen
DOI:10.1055/s-2006-926383
日期:——
γ-(2,4-Dioxobut-1-ylidene)butenolides were prepared with very good regioselectivity by reaction of (2,4-dioxobutylidene)triphenylphosphoranes with maleic anhydrides. The reaction of 1,3-bis-silyl enol ethers with phthaloyl dichloride afforded benzo-annulated γ-(2,4-dioxobut-1-ylidene)butenolides; the formation of these products can be explained by formation of iso-phthaloyl dichloride and attack of the bis-silyl enol ether onto the latter.