Iodine-Catalyzed Facile Approach to Sulfones Employing TosMIC as a Sulfonylating Agent
摘要:
A novel iodine-catalyzed functionalization of a variety of olefins and alkynes and direct decarboxylative functionalization of cinnamic and propiolic acids with TosMIC to provide access to various vinyl, allyl, and beta-iodo vinylsulfones is described. This simple, efficient, and environmentally benign approach employing inexpensive molecular iodine as a catalyst demonstrates a versatile protocol for the synthesis of highly valuable sulfones, rendering it attractive to both synthetic and medicinal chemistry.
DOI:
10.1021/acs.orglett.7b00896
作为产物:
描述:
3-Cyanocinnamyl alcohol 在
manganese dioxide 作用下,
以
二氯甲烷 为溶剂,
反应 16.0h,
以to give the title product as a white solid, m.p. 100° C.的产率得到3-(3-oxo-propenyl)-benzonitrile
A highly stereoselective tandem Michael addition-Wittig reaction of (3-carboxy-2-oxopropylidene)triphenylphosphorane and α,β-unsaturated aldehydes has been developed by employing the combined catalysis of a newly designed bulky chiral secondary amine 1g, LiClO4, and DABCO. The multifunctional 6-carboxycyclohex-2-en-1-ones were generally obtained in excellent diastereo- and enantioselectivities (dr
<i>N</i>-TFA-Gly-Bt-Based Stereoselective Synthesis of Substituted 3-Amino Tetrahydro-2<i>H</i>-pyran-2-ones via an Organocatalyzed Cascade Process
作者:Liuqing Han、Ke Li、Haitong Xu、Tao Mei、Yali Sun、Jingping Qu、Yuming Song
DOI:10.1021/acs.joc.9b01488
日期:2019.8.16
excellent enantioselectivities (up to 99% ee) via an organo-catalyzed cascade procedure with N-TFA-Gly-Bt and α,β-unsaturated aldehydes as the substrates. The corresponding tetrahydro-2H-pyran-2-ones can be used for further synthetic transformations that furnish chiral-substituted 3-aminopiperidin-2-ones with high levels of stereoselectivity.
This invention is directed to benzenamine derivatives of formula (I):
wherein A, W, m, n, R1, R2, R3, R4, R5 and R6 are defined herein. These compounds are useful as anti-coagulants.
oxindoles has been successfully developed through a formal [2+2+2] annulation strategy. The amine‐catalysed stereoselective Michaeladdition of aliphatic aldehydes to electron‐deficient olefinic oxindole motifs gave chiral C3 components, which were further combined with diverse electrophiles (activated olefins or imines) to afford spirocyclic oxindoles with versatile molecular complexity (up to six contiguous