Stereoselective Synthesis of (<i>Z</i>)- and (<i>E</i>)-Allyl Aryl Sulfides and Selenides from<i>Baylis</i><i>Hillman</i>Acetates under Neutral Conditions Using<i>β</i>-Cyclodextrin in Water
The first example of the stereoselective synthesis of (Z)‐ and (E)‐allylarylsulfides and selenides from BaylisHillman acetates under neutral conditions in H2O by supramolecular catalysis involving β‐cyclodextrin is reported. β‐Cyclodextrin can be recovered and reused. The reaction is very efficient in providing allylarylsulfides and selenides in good‐to‐excellent yields with clean reaction profiles
Regio- and stereoselective syntheses of allylic thioethers under metal free conditions
作者:Pratibha Singh、Rekha Bai、Rakhee Choudhary、Mahesh C. Sharma、Satpal Singh Badsara
DOI:10.1039/c7ra04817c
日期:——
A metal free, regio and stereoselective syntheses of allylic thioethers using allyl iodides and aryl or alkyl disulfides as coupling partners is described. The densely functionalized allyl iodides having different stereochemistry (E & Z) reacted well with a variety of disulfides in a regio and stereoselective manner providing the resulting allyl aryl thioethers in 62–92% yields.
Through the cleavage of the CCbond, the first catalytictandemconjugateaddition–eliminationreaction of Morita–Baylis–HillmanCadducts has been presented. Various SN2′‐like C‐, S‐, and P‐allylic compounds could be obtained with exclusive E configuration in good to excellent yields. The Michael product could also be easily prepared by tuning the β‐C‐substituent group of the α‐methylene ester under
通过CC键的裂解,提出了Morita-Baylis-Hillman C加合物的第一个催化串联共轭加成-消除反应。可以通过独家E 构型获得各种S N 2'-样C-,S-和P-烯丙基化合物,并具有良好或优异的收率。在相同的反应条件下,通过调节α-亚甲基酯的β-C-取代基也可以很容易地制备迈克尔产物。通过DFT方法计算的各种跃迁状态的相对能量有力地支持了所观察到的化学选择性和非对映选择性。
A Mild and Efficient Stereoselective Synthesis of (Z)- and (E)-Allyl Sulfides and Potent Antifungal Agent, (Z)-3-(4-Methoxybenzylidene)thiochroman-4-one from Morita-Baylis-Hillman Acetates
A facile stereoselective synthesis of (Z)- and (E)-allyl sulfides has been accomplished from Morita–Baylis–Hillman acetates in one-pot by treatment with benzene thiol in the presence of catalytic amounts of 15% aqueous NaOH and TBAI in DMSO at room temperature. The method has been applied for the synthesis of (Z)-3-(4-methoxybenzylidene)thiochroman-4-one, a potent antifungal compound.
Stereoselective Cross-Coupling of Baylis–Hillman Acetates with Diphenyl Disulfides and Diselenides Using Palladium Acetate
作者:P. Surendra Reddy、M. Amarnath Reddy、B. Sreedhar、M. V. Basaveswara Rao
DOI:10.1080/00397910903219468
日期:2010.6.25
An efficient method is described for the stereoselective synthesis of diorganyl chalcogenides from a variety of Baylis-Hillman acetates and diaryl chalcogens using palladium catalyst. This reaction is a convenient new method to produce unsymmetrical sulfides and selenides in good yields.