Applications of highly enantioenriched alcohols bearing a phenylthio group in the preparation of ring compounds. The two-pot synthesis of an enantiopure spiroacetal pheromone bearing three chiral centers
摘要:
The new chiron (S)-6-phenylthio-2-hexanol (3) was prepared in high enantiomeric excess by baker's yeast reduction of the corresponding ketone. Enantioenriched alcohols 1, 2 and 3, prepared previously by a similar procedure, or their racemic counterparts, were transformed into ring closed compounds 5-methyl-2-(phenylthio)tetrahydrofuran (9), 6-methyl-2-(phenylthio)tetrahydropyran (10), 2-methyl-1-phenylsulfonyl cyclopropane (14), cyclobutane (15), cyclopentane (16), and a bee pheromone, (2S,6R,8S)-2,8-dimethyl-1,7-dioxaspiro[5.5]undecane (20). (C) 1997 Elsevier Science Ltd.
Two-flask preparation of .alpha.-lithio cyclic ethers from .gamma.- and .delta.-lactones. Reductive lithiation as a route, via radical intermediates, to axial 2-lithiotetrahydropyrans and their equilibration to the equatorial isomers
作者:Theodore Cohen、Ming Teh Lin
DOI:10.1021/ja00316a060
日期:1984.2
Application a la synthese du rose oxyde et de perhydro furannes, -pyrannes et -chromannes substitues en 2
应用 a la synthese du rose oxyde et de perhydrofuranes, -pyrannes et -chromannes substitues en 2
Metal-Free Oxidative C(sp<sup>3</sup>)–H Bond Thiolation of Ethers with Disulfides
作者:Sheng-rong Guo、Yan-qin Yuan、Jian-nan Xiang
DOI:10.1021/ol402281f
日期:2013.9.20
A novel method for the preparation of alkyl aryl sulfides through direct oxidationthiolation of commercial ethers with diaryl disulfides using di-tert-butyl peroxide (DTBP) as the oxidant without a metal catalyst was established. The C(sp3)–Hbond in various ethers was successfully converted into a C–S bond, and the corresponding sulfides were achieved with moderate to high yields.
Visible-Light-Induced Direct Thiolation at α-C(sp<sup>3</sup>)–H of Ethers with Disulfides Using Acridine Red as Photocatalyst
作者:Xianjin Zhu、Xiaoyu Xie、Pinhua Li、Jianqi Guo、Lei Wang
DOI:10.1021/acs.orglett.6b00304
日期:2016.4.1
α-arylthioethers through a visible-light-induced direct thiolation at α-C(sp3)–H of ethers with diaryldisulfides was developed using acridine red as a novel photocatalyst. The reactions occurred at ambient conditions and generated the corresponding products in good to excellent yields, ignoring steric effect of disulfides.
A simple and inherent green photocatalytic approach using commercially available and cheap nBu4NBr with 4-CzIPN was reported to effectively initiate the site-selective α-C(sp3)-H activation of tetrahydrofuran for C-S and C-C cross-couplings.
Photoinduced C(sp<sup>3</sup>)–H Chalcogenation of Amide Derivatives and Ethers via Ligand-to-Metal Charge-Transfer
作者:Ben Niu、Krishnakumar Sachidanandan、Maria Victoria Cooke、Taylor E. Casey、Sébastien Laulhé
DOI:10.1021/acs.orglett.2c01505
日期:2022.7.1
A photoinduced, iron(III) chloride-catalyzed C–H activation of N-methyl amides and ethers leads to the formation of C–S and C–Se bonds via a ligand-to-metal charge transfer (LMCT) process. This methodology converts secondary and tertiary amides, sulfonamides, and carbamates into the corresponding amido-N,S-acetal derivatives in good yields. Mechanistic work revealed that this transformation proceeds