Samarium(II) iodide mediated intramolecular reductivecoupling of carbonyl groups and alkynes in the presence of HMPA and t-BuOH was successfully performed to provide cyclized products. Some cyclic compounds containing a heteroatom such as oxygen or nitrogen were also efficiently prepared by this coupling reaction.
Dual Photoredox/Cobalt-Catalyzed Reductive Cyclization of Alkynals
作者:Kento Nakamura、Hina Nishigaki、Yoshihiro Sato
DOI:10.1021/acscatal.3c06206
日期:2024.3.1
alkynals using H2O for the catalyst turnover. This method was applied to aliphatic and aromatic aldehydes for five-, six-, and seven-membered (heterocyclic) ring formation with various substitutions on alkyne units. This H2O-added protocol was further developed into a one-pot transformation fromacetals through in situ generated aldehydes, which shortened the synthetic path of the reaction.
取代环醇是药学上必需的支架之一。在这里,我们报道了使用 H 2 O进行催化剂周转的光氧化还原/钴催化的炔醛还原环化。该方法适用于脂肪族和芳香族醛,形成五元、六元和七元(杂环)环,并在炔单元上进行各种取代。这种添加H 2 O的方案进一步发展为从缩醛到原位生成醛的一锅转化,从而缩短了反应的合成路径。
A New Stereoselective Method for the Preparation of Allylic Alcohols
作者:Eric Oblinger、John Montgomery
DOI:10.1021/ja9719182
日期:1997.9.1
Stereoselective Synthesis of Alkenes by Using Unimolecular Chain Transfer Reactions of Silicon Hydrides
作者:Angeles Martinez-Grau、Dennis P. Curran
DOI:10.1021/jo00131a003
日期:1995.12
Asymmetric reduction of prochiral cycloalkenones. The influence of exocyclic alkene geometry
作者:Alison F. Simpson、Corinna D. Bodkin、Craig P. Butts、Mark A. Armitage、Timothy Gallagher
DOI:10.1039/b004540n
日期:——
The asymmetric reduction of a series of prochiral enones of general structure 1 using the Corey oxazaborolidine 2, leading to enantiomerically enriched allylic cycloalkanols 3 is described. The influence of alkene geometry on both the sense (Rvs. S) and efficiency (% ee) of the asymmetric reduction process has been probed for two systems, (E)- and (Z)-4 and (E)- and (Z)-7, based on cyclohexanone and cyclopentanone respectively. The absolute stereochemistry of the cyclopentyl derivative (E)-8 has been established by X-ray crystallographic analysis of carbamate 10. The ability to assign an absolute configuration to allylic alcohols 3, based on the NMR methods described earlier by Riguera, has been evaluated.