Diastereoselective synthesis of bis(3,5)pyrazolophanes by sequential inter- and intramolecular cycloadditions of homochiral nitrilimines
摘要:
Starting from ethyl (S)-lactate as the chiral unit, we have developed the synthesis of the enantiopure bis(3,5)pyrazolophanes 9 and 19 by means of sequential inter- and intramolecular cycloadditions of nitrilimine intermediates. (C) 2000 Elsevier Science Ltd. All rights reserved.
Palladium-Catalyzed Sequential Alkylation−Alkenylation Reactions. Application to the Synthesis of 2-Substituted-4-Benzoxepines and 2,5-Disubstituted-4-Benzoxepines
The synthesis of 2-substituted-4-benzoxepines and 2,5-disubstituted-4-benzoxepines from aryliodides and bromoenoates is described. This methodology is based on a palladium-catalyzed aromatic substitution followed by an intramolecular Heck sequence. Under the reaction conditions (Pd(OAc)(2) (10 mol %), tri-2-furylphosphine (20 mol %), norbornene (2 equiv), Cs(2)CO(3) (2 equiv), CH(3)CN, 85 degrees
Starting from ethyl (S)-lactate as the chiral unit, we have developed the synthesis of the enantiopure bis(3,5)pyrazolophanes 9 and 19 by means of sequential inter- and intramolecular cycloadditions of nitrilimine intermediates. (C) 2000 Elsevier Science Ltd. All rights reserved.
Diastereoselective Synthesis of <i>trans</i>-β-Amino Cyclohexyl Ketones and <i>trans</i>-3-Amino-4-acyl-tetrahydropyrans from Intramolecular C-Alkylation of ω-Halo-Substituted β-Sulfinamido Ketones
作者:Kanniyappan Silambarasan、Gangarajulu Kesavulu、Arava Amaranadha Reddy、Kavirayani R. Prasad
DOI:10.1021/acs.joc.2c02227
日期:2023.2.17
Reaction of ω-halo-substituted nonracemic β-sulfinamido ketones with NaH afforded the β-amino cyclohexyl ketones in excellent yields and diastereoselectivity, via an intramolecularC-alkylation, α to the carbonyl group. The reaction was found to be general and can be applied for the synthesis of different cyclohexyl amino ketones and tetrahydropyrans possessing amine and acyl substitutions.
ω-卤素取代的非外消旋 β-亚磺酰氨基酮与 NaH 的反应以优异的产率和非对映选择性提供 β-氨基环己基酮,通过分子内 C-烷基化,将 α 转化为羰基。该反应具有普适性,可用于合成具有胺基和酰基取代基的不同环己基氨基酮和四氢吡喃。