NaH mediated isomerisation–allylation reaction of 1,3-substituted propenols
作者:Adam J. S. Johnston、Mark G. McLaughlin、Jolene P. Reid、Matthew J. Cook
DOI:10.1039/c3ob41857j
日期:——
A base mediated isomerisationâallylation protocol of 1,3-disubstituted propenols has been established. The use of diaryl and aryl-silyl substrates is reported alongside the use of substituted allyl bromides. Mechanistic experiments have also been conducted to elucidate the reaction pathway.
Siloxyallenes revisited. A useful functional intermediate for the synthesis of (Z)-β-branched Morita–Baylis–Hillman type adducts and (Z)-chalcones
作者:Kazuhiro Yoshizawa、Takayuki Shioiri
DOI:10.1016/j.tet.2007.02.025
日期:2007.7
Siloxyallenes proved to be a usefulfunctionalintermediate in the preparation of (Z)-β-branched Morita–Baylis–Hillman type adducts by the reaction of aldehydes with silylacetylenes or siloxypropynes. Various (Z)-chalcones were stereoselectively synthesized from siloxypropynes via siloxyallenes.
propargylation of CoQ0 is described by employing the cooperative effect of Sc(OTf)3 and Hantzschester. It is suggested to work through the redox chain reaction, which involves hydroquinone and dimeric propargylic moiety intermediates. A broad range of propargylic alcohols can be converted into the appropriate derivatives of CoQ0 containing triple bonds in good to excellent yields. The mechanism of the given
Base-Mediated Cascade Rearrangements of Aryl-Substituted Diallyl Ethers
作者:Jolene P. Reid、Catherine A. McAdam、Adam J. S. Johnston、Matthew N. Grayson、Jonathan M. Goodman、Matthew J. Cook
DOI:10.1021/jo502403n
日期:2015.2.6
Two base-mediated cascade rearrangement reactions of diallyl ethers were developed leading to selective [2,3]-Wittig–oxy-Cope and isomerization–Claisen rearrangements. Both diaryl and arylsilyl-substituted 1,3-substituted propenyl substrates were examined, and each exhibits unique reactivity and different reaction pathways. Detailed mechanistic and computational analysis was conducted, which demonstrated
Alkynyl Borrowing: Silver-Catalyzed Amination of Secondary Propargylic Alcohols via C(sp<sup>3</sup>)–C(sp) Bond Cleavage
作者:Xin Zhuang、Min Zhu、Chuan-Ming Hong、Zhen Luo、Wan-Fang Li、Qing-Hua Li、Qun-Li Luo、Tang-Lin Liu
DOI:10.1021/acs.joc.2c00297
日期:2022.4.15
The silver-catalyzed alkynyl borrowing amination of secondary propargyl alcohols via C(sp3)–C(sp) bond cleavage has been developed. This new strategy was based on the β-alkynyl elimination of propargyl alcohols and alkynyl as the borrowing subject. This alkynyl borrowing amination featured high atom economy, wide functional group tolerance, and high efficiency.