A diastereoselective nucleophilic dichloromethylation between the N-tert-butanesulfinyl imines and dichloromethyllithium was developed. A series of 2-chloroaziridines with excellent yields and dr values were obtained via this nucleophilic addition and N-alkylation in one pot. On the basis of X-ray crystallography experiment, the predicting model for this diastereoselective transformation was provided
Abstract A solvent-free, versatile procedure has been developed for the effective synthesis of tert-butanesulfinylimines of a variety of aldehydes using chiral tert-butanesulfinamides under green, sonochemical conditions. This method utilizes silica supported p-toluenesulfonic acid (pTSA·SiO2) as an efficient, safer and inexpensive catalystunder aerobic conditions. The practicable simplicity, easy
Enantiodivergent Approach to the Synthesis of <i>Cis</i>-2,6-Disubstituted Piperidin-4-ones
作者:Alejandro Lahosa、Miguel Yus、Francisco Foubelo
DOI:10.1021/acs.joc.9b01008
日期:2019.6.7
β-amino ketone derivatives were synthesized by decarboxylative Mannich reaction of chiral N-tert-butanesulfinyl imines with β-keto acids and were subsequently transformed into cis-2,6-disubstituted piperidin-4-ones through an organocatalyzed condensation with aldehydes. Both enantiomers were accessible from the same precursors by inverting the order in the reaction sequence of the aldehydes involved
Dual gold/photoredox-catalyzed bis-arylative cyclization of chiral homopropargyl sulfonamides with diazonium salts: rapid access to enantioenriched 2,3-dihydropyrroles
作者:Ze-Shu Wang、Tong-De Tan、Cai-Ming Wang、Ding-Qiang Yuan、Te Zhang、Pengfei Zhu、Chunyin Zhu、Jin-Mei Zhou、Long-Wu Ye
DOI:10.1039/c7cc03262e
日期:——
yzed bis-arylative cyclization of chiral homopropargyl sulfonamides with diazonium salts has been developed, allowing the facilesynthesis of various enantioenriched 2,3-dihydropyrroles in generally moderate to good yields with excellent enantioselectivities under very mild conditions without using any strong oxidants. The reaction is proposed to undergo an AuI/AuIII redox cycle promoted by visible-light
已经开发了一种新颖的双金/光氧化还原催化的手性高炔丙基磺酰胺与重氮盐的双芳基双芳基环化反应,可以在非常温和的条件下以中等的中度到良好的收率轻松合成各种对映体富集的2,3-二氢吡咯,并具有极好的对映选择性,而无需使用任何强氧化剂。建议该反应经历由可见光光氧化还原催化促进的Au I / Au III氧化还原循环。
Stereoselective synthesis of 5-(1-aminoalkyl)-2-pyrrolidones and 1,7-diazaspiro[4.5]decane-2,8-diones from chiral N-tert-butanesulfinyl imines and ethyl 4-nitrobutanoate
The reaction of N-tert-butanesulfinyl imines with ethyl 4-nitrobutanoate under basic conditions produced nitro amine derivatives. The resulting β-nitroamine derivatives, isolated as a 1:1 mixture of epimers, were easily transformed into 5-(1-aminoalkyl)-2-pyrrolidones, upon reduction of the nitro group with concomitant γ-lactam formation. On the other hand, selective removal of the sulfinyl group in