La cycloaddition du cetene avec des composes acetyleniques donne des cyclobutene-2ones。Ces dernieres reagissent avec des composes acetyleniques pour donner des resorcinols et le tetrahydro-6a,7,10,10a 大麻
Silver-Promoted Benzannulations of Siloxyalkynes with Pyridinium and Isoquinolinium Salts
作者:Jaime R. Cabrera-Pardo、David I. Chai、Sergey A. Kozmin
DOI:10.1002/adsc.201300443
日期:2013.9.16
efficient benzannulations of siloxyalkynes with pyridinium and isoquinolinium salts. Such reactions are successfully promoted by a stoichiometric amount of silver(I) benzolate under mild reaction conditions. This process proceeds via a formal inverse‐electron demand Diels–Alder reaction, followed by fragmentation of the initially produced bicyclic adducts to deliver a range of synthetically useful phenols
Non-Precious Metals Catalyze Formal [4 + 2] Cycloaddition Reactions of 1,2-Diazines and Siloxyalkynes under Ambient Conditions
作者:Chintan S. Sumaria、Yunus E. Türkmen、Viresh H. Rawal
DOI:10.1021/ol501254h
日期:2014.6.20
Copper(I) and nickel(0) complexes catalyze the formal [4 + 2] cycloaddition reactions of 1,2-diazines and siloxyalkynes, a reaction hitherto best catalyzed by silver salts. These catalysts based on earth abundant metals are not only competent, but the copper catalyst, in particular, promotes cycloadditions of pyrido[2,3-d]pyridazine and pyrido[3,4-d]pyridazine, enabling a new synthesis of quinoline
铜 (I) 和镍 (0) 配合物催化 1,2-二嗪和甲硅烷氧基炔烃的正式 [4 + 2] 环加成反应,该反应迄今为止最好由银盐催化。这些基于富含地球的金属的催化剂不仅有能力,而且铜催化剂,特别是促进吡啶并[2,3- d ]哒嗪和吡啶并[3,4- d ]哒嗪的环加成,使喹啉和异喹啉衍生物,以及环己烯酮与甲硅烷氧基炔烃的正式 [2 + 2] 环加成反应。
A benzannulation strategy for the synthesis of phenols and heteroaromatic compounds based on the reaction of (trialkylsilyl)vinylketenes with lithium ynolates
作者:Wesley F. Austin、Yongjun Zhang、Rick L. Danheiser
DOI:10.1016/j.tet.2007.10.113
日期:2008.1
(Trialkylsilyl)vinylketenes react with lithium ynolates to generate 3-(oxido)dienylketenes, which undergo rapid 6π-electrocyclization. The ultimate products of this benzannulation are highly substituted resorcinol monosilyl ethers, which are formed via a [1,3] carbon to oxygen silyl group shift. Further transformations of the benzannulation products are described providing efficient access to ortho-benzoquinones
Silver-Catalyzed Formal Inverse Electron-Demand Diels–Alder Reaction of 1,2-Diazines and Siloxy Alkynes
作者:Yunus E. Türkmen、Timothy J. Montavon、Sergey A. Kozmin、Viresh H. Rawal
DOI:10.1021/ja302537j
日期:2012.6.6
A highly effective silver-catalyzed formal inverse electron-demand Diels-Alder reaction of 1,2-diazines and siloxyalkynes has been developed. The reactions provide ready access to a wide range of siloxy naphthalenes and anthracenes, which are formed in good to high yields, under mild reaction conditions, using low catalyst loadings.
Silver-Catalyzed Aldehyde Olefination Using Siloxyalkynes
作者:Jianwei Sun、Valerie A. Keller、S. Todd Meyer、Sergey A. Kozmin
DOI:10.1002/adsc.200900835
日期:2010.3.22
describe the development of a silver‐catalyzed carbonyl olefination employing electron‐rich siloxyalkynes. This process constitutes an efficient synthesis of trisubstituted unsaturated esters, and represents an alternative to the widely utilized Horner–Wadsworth–Emmons reaction. Excellent diastereoselectivities are observed for a range of aldehydesusing either 1‐siloxy‐1‐propyne or 1‐siloxy‐1‐hexyne. This