An Enantioselective Route to (−)-δ9(12)-Capnellene Employing Silyl Group Directed Stereo Control
摘要:
A formal synthesis of a marine natural product (.)-Delta(9(12))-capnellene has been achieved by employing silyl group directed stereo control, starting from (-)-2-methyl-4-trimethylsilyl-2-cyclopenten-1-one.
Isolable and Readily Handled Halophosphonium Pre-reagents for Hydro- and Deuteriohalogenation
作者:Florian T. Schevenels、Minxing Shen、Scott A. Snyder
DOI:10.1021/jacs.6b12653
日期:2017.5.10
and acid-sensitive moieties, particularly polyenes prone to cyclization. The process is also challenging when conducted on a small scale, and moreover, methods for the addition of their deuterated counterparts typically require special techniques, especially when control of stoichiometry is required. Herein is described a readily synthesized and handled reagent class which can accomplish the controlled
Reductive Allylic Defluorinative Cross-Coupling Enabled by Ni/Ti Cooperative Catalysis
作者:Zhiyang Lin、Yun Lan、Chuan Wang
DOI:10.1021/acs.orglett.9b03102
日期:2019.10.18
synthesis, but they have been rarely engaged in cross-electrophile coupling. Herein, we report a Ni/Ti-cocatalyzed reductive allylic defluorinative cross-coupling between trifluoromethyl alkenes and unactivated alkyl chlorides and bromides, enabling the efficient preparation of diverse functional-group-rich gem-difluoroalkenes. Notably, synthesis of the gem-difluoroalkene analogues of azaperone, haloperidol
hydroiodination of unactivated alkenes using methanesulfonic acid and inorganic halide salts (CaCl2, LiBr, LiI) in acetic acid are reported. This approach uses readily available and inexpensive reagents to provide the alkylhalides in up to 99% yield. An example of deuteriochlorination using deuterated acetic acid as the solvent is also demonstrated.
Decarbonylative Transfer Hydrochlorination of Alkenes and Alkynes Based on a B(C
<sub>6</sub>
F
<sub>5</sub>
)
<sub>3</sub>
‐Initiated Grob Fragmentation
作者:Kaixue Xie、Martin Oestreich
DOI:10.1002/anie.202203692
日期:2022.6.13
fragmentation of cyclohexa-2,5-dien-1-yl-substituted acyl chlorides into a low-molecular-weight arene, carbon monoxide and HCl. In the presence of π-basic substrates such as alkenes and alkynes, HCl is transferred stepwise to afford the corresponding hydrochlorination products. The overall reaction is a decarbonylative transfer hydrochlorination driven by aromatization and carbon-monoxide release.
Dinuclear (salen)Ti complexcatalyzes the reductive coupling reaction of tertiary chlorides with excellent chemoselectivity. The all-carbon quaternary carbon compounds were successfully constructed with broad substrate scope and excellent functional group tolerance.
双核 (salen) Ti 络合催化叔氯离子的还原偶联反应,具有优异的化学选择性。成功构建了全碳季铵碳化合物,具有较宽的底范围和优异的官能团耐受性。