Cut and join together: Chiral Copper phosphate complexes efficiently promoted a tandem sequence of deoxygenation/[4+2] cycloaddition reactions. This process gives access to various tetrahydroquinolines with threeconsecutive stereogenic centers in good yields with excellent diastereo‐and enantioselectivity.
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。
Catalytic Asymmetric Synthesis of Cyclopentyl β‐Amino Esters by [3+2] Cycloaddition of Enecarbamates with Electrophilic Metalloenolcarbene Intermediates
作者:Yongming Deng、Matthew V. Yglesias、Hadi Arman、Michael P. Doyle
DOI:10.1002/anie.201605438
日期:2016.8.16
Chiral cyclopentyl β‐amino esters are formed catalytically by [3+2] cycloaddition reactions of enecarbamates with electrophilic metalloenolcarbenes in high yield with up to 98 % ee and excellent diastereocontrol. Use of β‐silyl‐substituted enoldiazoacetates with a chiral dirhodium catalyst and trans‐β‐arylvinylcarbamates are optimal for this transformation, which occurs with hydrogen‐bond association
Trimethylchlorosilane-promoted aza-Mannich reaction of enecarbamates and aldimines
作者:Pengcheng Wu、Deqin Lin、Xiaoxia Lu、Li Zhou、Jian Sun
DOI:10.1016/j.tetlet.2009.09.097
日期:2009.12
A trimethylchlorosilane-promoted aza-Mannich reaction is reported utilizing enecarbamates as the nucleophile and aromatic N-Boc aldimines as the electrophile. A variety of nucleophiles and electrophiles are tolerated by the reaction conditions, delivering the adduct products in excellent yields with high E-stereoselectivities. (C) 2009 Elsevier Ltd. All rights reserved.
Cerium(IV) Ammonium Nitrate Mediated Three-Component α-Allylation of Imine Surrogates
作者:Mathieu Bekkaye、Géraldine Masson
DOI:10.1021/ol5004143
日期:2014.3.7
A general and practical CAN-mediated oxidative radical alpha-coupling reaction of various imine surrogates with allylsilanes has been described. This multicomponent process affords beta-allylated alpha-carbamido ethers as stable imine precursors in respectable yields under mild conditions.