A Facile and Efficient Approach to
<i>N</i>
‐Protected‐β‐Sulfinyl‐ enamines
<i>via C</i>
‐Sulfinylation of Enamides and Enecarbamates
作者:Yinhui Li、Ke Cheng、Xiaoxia Lu、Jian Sun
DOI:10.1002/adsc.201000084
日期:2010.10.9
A practical method has been developed for the C-sulfinylation of enamides and enecarbamates using sodium phenylsulfinate/methyltrichlorosilane (PhSO2Na/MeSiCl3) as the sulfinylating reagent and N,N-dimethylacetamide (DMAc) as the Lewis base promoter, which allows for the preparation of a variety of N-protected-β-sulfinylenamines in high yields and good stereoselectivities. The Lewis base is found to
已开发出一种实用的方法,使用苯磺酸钠/甲基三氯硅烷(PhSO 2 Na / MeSiCl 3)作为亚磺酰化试剂,并使用N,N-二甲基乙酰胺(DMAc)作为路易斯碱促进剂,对酰胺和烯氨基甲酸酯进行C-亚磺酰基化。以高收率和良好的立体选择性制备各种N-保护的β-亚磺酰亚胺胺。发现路易斯碱对于活性亚磺酰基化物质(PhSOC1)的原位生成和亚磺酰基化步骤均是重要的。
Chiral Brønsted Acid Catalyzed Enantioselective α-Aminoxylation of Enecarbamates
A practically simple, highly enantioselective Brønstedacidcatalyzedα‐aminoxylation of enecarbamates extends the substrate scope for the α‐aminoxylation to linear and aromatic ketones, allowing convergent and stereoselective access to valuable α‐hydroxy ketones, β‐amino alcohols, and cis‐oxazolidinones.
Preparation and Allylation of Enamides and Enecarbamates Generated via Iron(0) Reduction of Oximes and Derivatives
作者:Steven Weinreb、Cuixiang Sun
DOI:10.1055/s-2006-942513
日期:2006.11
Reductive acylation of oximes and oxime carbonates can be effected with iron powder in the presence of an acid chloride or a chloroformate to produce enamides or enecarbamates.
用铁粉在酸氯化物或氯甲酸酯存在下进行亚胺和亚胺碳酸酯的还原酰化,可生产出烯酰胺或烯碳酸酯。
Methyltrichlorosilane-DMSO: A Facile and Highly Efficient Recipe for the Chlorination of Enamides and Enecarbamates
作者:Xiaoxia Lu、Jian Sun、Deqing Lin、Ke Cheng
DOI:10.1055/s-0029-1218005
日期:2009.11
A facile and highly efficient method was developed for the chlorination of enamides and enecarbamates with the combined use of methyltrichlorosilane and DMSO, which allowed one-pot production of the corresponding β-chloro enamides and enecarbamates in high yield and good stereoselectivity. This method is easy to operate and suitable for both cyclic and acyclic substrates.