Decarboxylative and dehydrative coupling of dienoic acids and pentadienyl alcohols to form 1,3,6,8-tetraenes
作者:Ghina’a I Abu Deiab、Mohammed H Al-Huniti、I F Dempsey Hyatt、Emma E Nagy、Kristen E Gettys、Sommayah S Sayed、Christine M Joliat、Paige E Daniel、Rupa M Vummalaneni、Andrew T Morehead、Andrew L Sargent、Mitchell P Croatt
DOI:10.3762/bjoc.13.41
日期:——
Dienoic acids and pentadienyl alcohols are coupled in a decarboxylative and dehydrative manner at ambient temperature using Pd(0) catalysis to generate 1,3,6,8-tetraenes. Contrary to related decarboxylative coupling reactions, an anion-stabilizing group is not required adjacent to the carboxyl group. Of mechanistic importance, it appears that both the diene of the acid and the diene of the alcohol
Synthesis of unsaturated esters from aldehydes: An inexpensive, practical alternative to the Horner-Emmons reaction under neutral conditions
作者:Brian E. Ledford、Erick M. Carreira
DOI:10.1016/s0040-4039(97)10182-4
日期:1997.11
A practical, efficient, and mild process is described for the synthesis of unsaturatedesters from aldehydes in good yields and diastereoselectivities. All of the reagents used in the protocol are commercially available at a nominal price: N2CHCO2Et, catalytic (1 mol%) ReOCl3(PPh3)2, and (EtO)3P. Additionally, the reaction process can be carried out successfully in good yields (85%) and diastereoselectivities
Activation of <i>N</i>-Sulfonyl Oxaziridines Using Copper(II) Catalysts: Aminohydroxylations of Styrenes and 1,3-Dienes
作者:David J. Michaelis、Michael A. Ischay、Tehshik P. Yoon
DOI:10.1021/ja800495r
日期:2008.5.1
N-Sulfonyloxaziridines are susceptible to electrophilic activation using copper(II) catalysts and react with styrenes under these conditions to provide 1,3-oxazolidines in a formal aminohydroxylation of the alkene. We propose a two-step mechanism involving a cationic intermediate to account for the rate differences and regioselectivities observed using a variety of styrenes. In accord with our hypothesis
N-磺酰基恶氮丙啶易于使用铜 (II) 催化剂进行亲电活化,并在这些条件下与苯乙烯反应以在烯烃的正式氨基羟基化中提供 1,3-恶唑烷。我们提出了一种涉及阳离子中间体的两步机制,以解释使用各种苯乙烯观察到的速率差异和区域选择性。根据我们的假设,一系列带有电子稳定基团的底物的氨基羟基化是成功的,1,3-二烯是铜(II)催化氨基羟基化的特别好的底物。不对称二烯的反应提供了良好到优异的烯烃选择性,考虑到我们的机制建议的阳离子中间体的稳定性,可以合理化其意义和大小。
Silylene-Mediated Polarity Reversal of Dienoates: Additions of Dienoates to Aldehydes at the δ-Position To Form <i>trans</i>-Dioxasilacyclononenes
作者:Christian C. Ventocilla、K. A. Woerpel
DOI:10.1021/ja109631z
日期:2011.1.26
trans-dioxasilacyclononenes as single stereoisomers. This reaction, which converts the δ-position of the unsaturated carbonyl compound into a nucleophilic center, represents an inversion of polarity from the normal pattern of reactivity. The stereospecificity of the reaction suggests that the addition to aldehydes occurred through a closed, chairlike six-membered transition state. This reaction can be
Molecular design of diene monomers containing an ester functional group for the synthesis of poly(diene sulfone)s by radical alternating copolymerization with sulfur dioxide
作者:Akikazu Matsumoto、Sungi Lee、Haruyuki Okamura
DOI:10.1002/pola.27528
日期:2015.4.15
Functionalpoly(diene sulfone)s are prepared by the radical alternating copolymerization of 1,3‐diene monomerscontaining an ester substituent with sulfur dioxide. Methyl 3,5‐hexadienoate (MH) and methyl 5,7‐octadienoate (MO) with both an alkylene spacer and a terminal diene structure are suitable to produce a high‐molecular‐weight copolymer in a high yield, while the copolymerization of 5,7‐nonadienoic