Practical and Robust Method for Regio- and Stereoselective Preparation of (<i>E</i>)-Ketene <i>tert</i>-Butyl TMS Acetals and β-Ketoester-derived <i>tert</i>-Butyl (1<i>Z</i>,3<i>E</i>)-1,3-Bis(TMS)dienol Ethers
We developed an efficient, practical, robust method for the regio- and stereoselective preparation of (E)-ketene trimethylsilyl acetals (KSAs) derived from tert-butyl esters 1. The reaction was performed under convenient reaction conditions; LDA−TMSCl, 0−5 °C, and cyclopentyl methyl ether (CPME) solvent. Two kinds of (Z)- and (E)-KSAs derived from α-oxygen and α-nitrogen-substituted tert-butyl esters
Phase-Transfer Catalyzed Asymmetric [4 + 1] Annulations for the Synthesis of Chiral 2,2-Disubstituted Tetrahydrothiophenes
作者:Qi Yin、Xiaolu Wen、Yiwei Chen、Xiangnan Gong、Lin Hu
DOI:10.1021/acs.orglett.1c02744
日期:2021.10.1
An efficient catalyticasymmetric [4 + 1] reaction, which features the use of simple β-keto esters as one-carbon nucleophiles and 5-succinimidothio-pent-2-enoates as four-atom bielectrophiles, has been developed in the presence of a bifunctional chiral phase-transfer catalyst. The new annulation provides a distinct protocol to access the functionalized 2-acyl-2-carboxyl tetrahydrothiophenes bearing
Geminal Diazides Derived from 1,3-Dicarbonyls: A Protocol for Synthesis
作者:Hellmuth Erhardt、Andreas P. Häring、Andreas Kotthaus、Markus Roggel、My Linh Tong、Phillip Biallas、Martin Jübermann、Fabian Mohr、Stefan F. Kirsch
DOI:10.1021/acs.joc.5b02328
日期:2015.12.18
Geminal diazides constitute a rare class of compounds where only a limited number of methods are available for their synthesis. We present the reaction of 1,3-dicarbonyl compounds (as exemplified by malonates, 3-oxoesters, and 1,3-diketones) with molecular iodine and sodium azide in aqueous DMSO providing a general access to geminal diazides. A broad range of geminal diazides with various structural
Synthesis of both the enantiomers of q-methyl pisiferic acid, a mite growth regulator isolated from endl
作者:Kenji Mori、Hideto Mori
DOI:10.1016/s0040-4020(01)88156-4
日期:1986.1
Diterpenoid total synthesis, an A .far. B .far. C approach. VIII. Introduction of oxygen at carbon-11. Total synthesis of (+-)-carnosic acid dimethyl ether and (+-)-carnosol dimethyl ether
作者:Walter L. Meyer、Richard A. Manning、Erich Schindler、Robert S. Schroeder、D. Craig Shew