Hetero-Diels–Alder Reaction of Phosphinyl and Phosphonyl Nitroso Alkenes with Conjugated Dienes: An Aza-Cope Rearrangement
作者:Jesús M. de los Santos、Roberto Ignacio、Gloria Rubiales、Domitila Aparicio、Francisco Palacios
DOI:10.1021/jo201116u
日期:2011.8.19
Phosphorylated nitroso alkenes react with cyclic dienes such as cyclopentadiene or cyclohexadiene to afford hetero Diels–Alder-type cycloadducts where the nitroso alkene participates as dienophile component and the cyclic olefin acts as the 4π-electron (diene) system. Subsequent aza-Cope rearrangement affords highly functionalized 5,6-dihydro-4H-1,2-oxazines. Conversely, the reaction of TMS-substituted
磷酸化的亚硝基烯烃与环二烯(例如环戊二烯或环己二烯)反应,生成杂Diels–Alder型环加合物,其中亚硝基烯烃作为亲二烯体组分参与其中,环烯烃充当4π电子(二烯)系统。随后的aza-Cope重排提供了高度官能化的5,6-二氢-4 H -1,2-恶嗪。相反,TMS取代的环戊二烯(双亲体)与亚硝基烯烃作为杂二烯的反应直接导致双环1,2-恶嗪。理论研究与实验结果以及提出的新aza-Cope重排相符。
Hetero-Diels–Alder Reaction of Phosphorylated Nitroso Alkenes with Enol Ethers on Water: A Clean Approach Toward 1,2-Oxazine Derivatives
作者:Jesús M. de los Santos、Roberto Ignacio、Zouhair Es Sbai、Domitila Aparicio、Francisco Palacios
DOI:10.1021/jo501339c
日期:2014.8.15
process, which involves a two-step sequence of reactions on-water, is a regioselective hetero-Diels–Alder cycloaddition reaction of enolethers to 4-phosphinyl or 4-phosphonyl nitroso alkenes mediated by water itself. The process has also been performed under solvent-free conditions and in organic solvents for comparison.
Michael Addition of Amine Derivatives to Conjugate Phosphinyl and Phosphonyl Nitrosoalkenes. Preparation of α-Amino Phosphine Oxide and Phosphonate Derivatives
作者:Jesús M. de los Santos、Roberto Ignacio、Domitila Aparicio、Francisco Palacios
DOI:10.1021/jo0705521
日期:2007.7.1
The synthesis of nitrosoalkenes derived from phosphine oxides and phosphonates generated through base-mediated dehydrohalogenations of readily available α-halooximes is reported. These highly reactive intermediates act as Michael acceptors toward nucleophilic reagents such as ammonia, amines, and optically active amino esters, furnishing α-amino phosphine oxides and phosphonates in a highly regioselective
Reactions of Conjugate Phosphinyl- and Phosphonyl-Nitroso Alkenes with Enamines. Preparation of <i>N</i>-Hydroxypyrrole Derivatives
作者:Jesús M. de los Santos、Roberto Ignacio、Domitila Aparicio、Francisco Palacios、José M. Ezpeleta
DOI:10.1021/jo900489j
日期:2009.5.1
The synthesis of highly functionalized N-hydroxypyrrole derivatives by the formal [3+2] cycloadditionreaction of enamines and nitroso alkenes derived from phosphine oxides and phosphonates is reported. Intermediate phosphorylated nitrones, whose formation can be explained by a conjugate addition of enamines to phosphorylated nitroso alkenes and formation of the five-membered heterocycles, are isolated