Functionalized Chromans and Isochromans via a Diastereoselective Pd(0)-Catalyzed Carboiodination
摘要:
A diastereoselective approach to isochromans and chromans via Pd(0)-catalyzed carboiodination is reported. The transformations using this methodology display excellent yields and diastereoselectivities as well as broad functional group compatibility. The selectivity observed in these cyclizations, forming isochroman or chroman targets, is postulated to originate from the minimization of A(1,2) strain and axial axial interactions, respectively. This method has also been used to highlight the concept of reversible oxidative addition to carbon iodine bonds in polyiodinated substrates.
A Construction of α-Alkenyl Lactones via Reduction Radical Cascade Reaction of Allyl Alcohols and Acetylenic Acids
作者:Hua Zhang、Guo-Min Zhang、Shuai He、Zhi-Chuan Shi、Xiao-Mei Zhang、Ji-Yu Wang
DOI:10.1021/acs.orglett.0c02973
日期:2020.11.6
An iron-catalyzed cascade reaction of radical reduction of allyl alcohols and acetylenic acids to construct polysubstituted α-alkenyl lactones has been developed. In this paper, various allyl alcohols can form allyl ester intermediates and are further transformed into alkyl radicals, which form products through intramolecular reflex-Michael addition. In addition, this method can be used to prepare
Facile Construction of Benzo[<i>d</i>][1,3]oxazocine: Reductive Radical Dearomatization of <i>N</i>-Alkyl Quinoline Quaternary Ammonium Salts
作者:Fu-Yu Li、Yao Xiao、Dong-Wei Huang、Meng Luo、Lu Li、Hong Xu、Bei Wang、Ji-Yu Wang
DOI:10.1021/acs.orglett.3c04243
日期:2024.3.15
Reductive radical dearomatization N-alkyl quinoline quaternary ammonium salts to synthesize structurally complex and challenging polysubstituted benzo[d][1,3]oxazocines was first reported. The mechanism showed various allyl alcohols can be converted into alkyl radicals under reduction conditions of iron/silane. These radicals then nucleophilically attack the C4 site of N-alkyl quinoline quaternary
首次报道了还原自由基脱芳构化N-烷基喹啉季铵盐合成结构复杂且具有挑战性的多取代苯并[ d ][1,3]恶佐辛。该机理表明,在铁/硅烷的还原条件下,各种烯丙醇可以转化为烷基自由基。然后这些自由基亲核攻击N-烷基喹啉季铵盐的C4位点,所得中间体的分子内环化生成目标产物。该方法不仅制备了一系列新型多取代苯并[ d ][1,3]恶唑嗪化合物,而且还制备了多环苯并[ d ][1,3]恶唑嗪化合物。最后,该策略弥补了N-烷基喹啉鎓盐还原自由基报道的不足,同时具有反应条件温和、底物范围广、产物结构新颖等优点。
CN115594653
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Conversion of Aldehydes to Branched or Linear Ketones via Regiodivergent Rhodium-Catalyzed Vinyl Bromide Reductive Coupling–Redox Isomerization Mediated by Formate
作者:Robert A. Swyka、William G. Shuler、Brian J. Spinello、Wandi Zhang、Chunling Lan、Michael J. Krische
DOI:10.1021/jacs.9b03113
日期:2019.5.1
coupling-redox isomerization to form branched ketones. Use of the less strongly coordinating ligand, PPh3, promotes vinyl- to allylrhodium isomerization en route to linear ketones. This method bypasses the 3-step sequence often used to convert aldehydes to ketones involving the addition of pre-metalated reagents to Weinreb or morpholine amides.
Functionalized Chromans and Isochromans via a Diastereoselective Pd(0)-Catalyzed Carboiodination
作者:David A. Petrone、Hasnain A. Malik、Antonin Clemenceau、Mark Lautens
DOI:10.1021/ol302111y
日期:2012.9.21
A diastereoselective approach to isochromans and chromans via Pd(0)-catalyzed carboiodination is reported. The transformations using this methodology display excellent yields and diastereoselectivities as well as broad functional group compatibility. The selectivity observed in these cyclizations, forming isochroman or chroman targets, is postulated to originate from the minimization of A(1,2) strain and axial axial interactions, respectively. This method has also been used to highlight the concept of reversible oxidative addition to carbon iodine bonds in polyiodinated substrates.