Difluoromethylation of N-arylsulfonyl hydrazones with difluorocarbene generated fromdifluoromethylene phosphobetaine (Ph3P+CF2CO2-) to give various difluoromethyl aryl sulfones is described.
Mn(III)-mediated phosphinoylation of aldehyde hydrazones: Direct “one-pot” synthesis of α-iminophosphine oxides from aldehydes
作者:Xue-Wei Bian、Ling Zhang、Adedamola Shoberu、Jian-Ping Zou
DOI:10.1016/j.tet.2021.132053
日期:2021.4
A “one-pot” strategy for the straightforward Mn(III)-mediated phosphinoylation of aldehyde hydrazones with diphenylphosphine oxide to furnish α-iminophosphine oxides is described. This mild and practical method allows the direct use of aldehydes as substrates in one pot to generate the hydrazones, which are then engaged “in situ” by the phosphorus reagent in the presence of Mn(OAc)3 oxidant. Thus,
Wittig Ylide Mediated Decomposition of <i>N</i>-Sulfonylhydrazones to Sulfinates
作者:Deepika Choudhary、Vineeta Khatri、Ashok K. Basak
DOI:10.1021/acs.orglett.7b03953
日期:2018.4.6
N-Sulfonylhydrazones generate sulfinates selectively when treated with a stabilized Wittig ylide in a polar aprotic solvent at elevated temperature. The transition metal and base free decomposition method is applicable to N-sulfonylhydrazones generated from a number of aromatic and heteroaromatic aldehydes and ketones. In the case of N-tosylhydrazones derived from O-allyl and O-propargyl salicylaldehydes
An efficient Cs2CO3‐promoted synthesis of α‐amino ketones using hydrazines, aldehydes, and α‐haloketones as starting materials through a cascade condensation/nucleophilic substitution/NNbondcleavage route is developed. The carbonyl group plays a key role in this novel NNbondcleavage process.
通过级联缩合/亲核取代/ NN键裂解途径,以肼,醛和α-卤代酮为起始原料,开发了一种高效的Cs 2 CO 3促进的α-氨基酮合成方法。羰基在这种新颖的NN键裂解过程中起关键作用。
Copper(I)-Catalyzed Stereoselective Synthesis of (1<i>E</i>,3<i>E</i>)-2- Sulfonyl-1,3-dienes from<i>N</i>-Propargylic Sulfonohydrazones
作者:Yu Zhu、Hai-Tao Tang、Zhuang-Ping Zhan
DOI:10.1002/adsc.201300126
日期:2013.5.3
A new method for the stereoselectivesynthesis of highly substituted (1E,3E)‐2‐sulfonyl‐1,3‐dienes from N‐propargylic sulfonohydrazone derivatives has been developed via copper(I)‐catalyzed [3,3] rearrangement and highly regioselective migration of the sulfonyl group.